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0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP___CXX03_STRING
0011 #define _LIBCPP___CXX03_STRING
0012
0013 // clang-format off
0014
0015 /*
0016 string synopsis
0017
0018 #include <__cxx03/compare>
0019 #include <__cxx03/initializer_list>
0020
0021 namespace std
0022 {
0023
0024 template <class stateT>
0025 class fpos
0026 {
0027 private:
0028 stateT st;
0029 public:
0030 fpos(streamoff = streamoff());
0031
0032 operator streamoff() const;
0033
0034 stateT state() const;
0035 void state(stateT);
0036
0037 fpos& operator+=(streamoff);
0038 fpos operator+ (streamoff) const;
0039 fpos& operator-=(streamoff);
0040 fpos operator- (streamoff) const;
0041 };
0042
0043 template <class stateT> streamoff operator-(const fpos<stateT>& x, const fpos<stateT>& y);
0044
0045 template <class stateT> bool operator==(const fpos<stateT>& x, const fpos<stateT>& y);
0046 template <class stateT> bool operator!=(const fpos<stateT>& x, const fpos<stateT>& y);
0047
0048 template <class charT>
0049 struct char_traits
0050 {
0051 using char_type = charT;
0052 using int_type = ...;
0053 using off_type = streamoff;
0054 using pos_type = streampos;
0055 using state_type = mbstate_t;
0056 using comparison_category = strong_ordering; // Since C++20 only for the specializations
0057 // char, wchar_t, char8_t, char16_t, and char32_t.
0058
0059 static void assign(char_type& c1, const char_type& c2) noexcept;
0060 static constexpr bool eq(char_type c1, char_type c2) noexcept;
0061 static constexpr bool lt(char_type c1, char_type c2) noexcept;
0062
0063 static int compare(const char_type* s1, const char_type* s2, size_t n);
0064 static size_t length(const char_type* s);
0065 static const char_type* find(const char_type* s, size_t n, const char_type& a);
0066 static char_type* move(char_type* s1, const char_type* s2, size_t n);
0067 static char_type* copy(char_type* s1, const char_type* s2, size_t n);
0068 static char_type* assign(char_type* s, size_t n, char_type a);
0069
0070 static constexpr int_type not_eof(int_type c) noexcept;
0071 static constexpr char_type to_char_type(int_type c) noexcept;
0072 static constexpr int_type to_int_type(char_type c) noexcept;
0073 static constexpr bool eq_int_type(int_type c1, int_type c2) noexcept;
0074 static constexpr int_type eof() noexcept;
0075 };
0076
0077 template <> struct char_traits<char>;
0078 template <> struct char_traits<wchar_t>;
0079 template <> struct char_traits<char8_t>; // C++20
0080 template <> struct char_traits<char16_t>;
0081 template <> struct char_traits<char32_t>;
0082
0083 template<class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
0084 class basic_string
0085 {
0086 public:
0087 // types:
0088 typedef traits traits_type;
0089 typedef typename traits_type::char_type value_type;
0090 typedef Allocator allocator_type;
0091 typedef typename allocator_type::size_type size_type;
0092 typedef typename allocator_type::difference_type difference_type;
0093 typedef typename allocator_type::reference reference;
0094 typedef typename allocator_type::const_reference const_reference;
0095 typedef typename allocator_type::pointer pointer;
0096 typedef typename allocator_type::const_pointer const_pointer;
0097 typedef implementation-defined iterator;
0098 typedef implementation-defined const_iterator;
0099 typedef std::reverse_iterator<iterator> reverse_iterator;
0100 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
0101
0102 static const size_type npos = -1;
0103
0104 basic_string()
0105 noexcept(is_nothrow_default_constructible<allocator_type>::value); // constexpr since C++20
0106 explicit basic_string(const allocator_type& a); // constexpr since C++20
0107 basic_string(const basic_string& str); // constexpr since C++20
0108 basic_string(basic_string&& str)
0109 noexcept(is_nothrow_move_constructible<allocator_type>::value); // constexpr since C++20
0110 basic_string(const basic_string& str, size_type pos,
0111 const allocator_type& a = allocator_type()); // constexpr since C++20
0112 basic_string(const basic_string& str, size_type pos, size_type n,
0113 const Allocator& a = Allocator()); // constexpr since C++20
0114 constexpr basic_string(
0115 basic_string&& str, size_type pos, const Allocator& a = Allocator()); // since C++23
0116 constexpr basic_string(
0117 basic_string&& str, size_type pos, size_type n, const Allocator& a = Allocator()); // since C++23
0118 template<class T>
0119 basic_string(const T& t, size_type pos, size_type n, const Allocator& a = Allocator()); // C++17, constexpr since C++20
0120 template <class T>
0121 explicit basic_string(const T& t, const Allocator& a = Allocator()); // C++17, constexpr since C++20
0122 basic_string(const value_type* s, const allocator_type& a = allocator_type()); // constexpr since C++20
0123 basic_string(const value_type* s, size_type n, const allocator_type& a = allocator_type()); // constexpr since C++20
0124 basic_string(nullptr_t) = delete; // C++23
0125 basic_string(size_type n, value_type c, const allocator_type& a = allocator_type()); // constexpr since C++20
0126 template<class InputIterator>
0127 basic_string(InputIterator begin, InputIterator end,
0128 const allocator_type& a = allocator_type()); // constexpr since C++20
0129 template<container-compatible-range<charT> R>
0130 constexpr basic_string(from_range_t, R&& rg, const Allocator& a = Allocator()); // since C++23
0131 basic_string(initializer_list<value_type>, const Allocator& = Allocator()); // constexpr since C++20
0132 basic_string(const basic_string&, const Allocator&); // constexpr since C++20
0133 basic_string(basic_string&&, const Allocator&); // constexpr since C++20
0134
0135 ~basic_string(); // constexpr since C++20
0136
0137 operator basic_string_view<charT, traits>() const noexcept; // constexpr since C++20
0138
0139 basic_string& operator=(const basic_string& str); // constexpr since C++20
0140 template <class T>
0141 basic_string& operator=(const T& t); // C++17, constexpr since C++20
0142 basic_string& operator=(basic_string&& str)
0143 noexcept(
0144 allocator_type::propagate_on_container_move_assignment::value ||
0145 allocator_type::is_always_equal::value ); // C++17, constexpr since C++20
0146 basic_string& operator=(const value_type* s); // constexpr since C++20
0147 basic_string& operator=(nullptr_t) = delete; // C++23
0148 basic_string& operator=(value_type c); // constexpr since C++20
0149 basic_string& operator=(initializer_list<value_type>); // constexpr since C++20
0150
0151 iterator begin() noexcept; // constexpr since C++20
0152 const_iterator begin() const noexcept; // constexpr since C++20
0153 iterator end() noexcept; // constexpr since C++20
0154 const_iterator end() const noexcept; // constexpr since C++20
0155
0156 reverse_iterator rbegin() noexcept; // constexpr since C++20
0157 const_reverse_iterator rbegin() const noexcept; // constexpr since C++20
0158 reverse_iterator rend() noexcept; // constexpr since C++20
0159 const_reverse_iterator rend() const noexcept; // constexpr since C++20
0160
0161 const_iterator cbegin() const noexcept; // constexpr since C++20
0162 const_iterator cend() const noexcept; // constexpr since C++20
0163 const_reverse_iterator crbegin() const noexcept; // constexpr since C++20
0164 const_reverse_iterator crend() const noexcept; // constexpr since C++20
0165
0166 size_type size() const noexcept; // constexpr since C++20
0167 size_type length() const noexcept; // constexpr since C++20
0168 size_type max_size() const noexcept; // constexpr since C++20
0169 size_type capacity() const noexcept; // constexpr since C++20
0170
0171 void resize(size_type n, value_type c); // constexpr since C++20
0172 void resize(size_type n); // constexpr since C++20
0173
0174 template<class Operation>
0175 constexpr void resize_and_overwrite(size_type n, Operation op); // since C++23
0176
0177 void reserve(size_type res_arg); // constexpr since C++20
0178 void reserve(); // deprecated in C++20, removed in C++26
0179 void shrink_to_fit(); // constexpr since C++20
0180 void clear() noexcept; // constexpr since C++20
0181 bool empty() const noexcept; // constexpr since C++20
0182
0183 const_reference operator[](size_type pos) const; // constexpr since C++20
0184 reference operator[](size_type pos); // constexpr since C++20
0185
0186 const_reference at(size_type n) const; // constexpr since C++20
0187 reference at(size_type n); // constexpr since C++20
0188
0189 basic_string& operator+=(const basic_string& str); // constexpr since C++20
0190 template <class T>
0191 basic_string& operator+=(const T& t); // C++17, constexpr since C++20
0192 basic_string& operator+=(const value_type* s); // constexpr since C++20
0193 basic_string& operator+=(value_type c); // constexpr since C++20
0194 basic_string& operator+=(initializer_list<value_type>); // constexpr since C++20
0195
0196 basic_string& append(const basic_string& str); // constexpr since C++20
0197 template <class T>
0198 basic_string& append(const T& t); // C++17, constexpr since C++20
0199 basic_string& append(const basic_string& str, size_type pos, size_type n=npos); // C++14, constexpr since C++20
0200 template <class T>
0201 basic_string& append(const T& t, size_type pos, size_type n=npos); // C++17, constexpr since C++20
0202 basic_string& append(const value_type* s, size_type n); // constexpr since C++20
0203 basic_string& append(const value_type* s); // constexpr since C++20
0204 basic_string& append(size_type n, value_type c); // constexpr since C++20
0205 template<class InputIterator>
0206 basic_string& append(InputIterator first, InputIterator last); // constexpr since C++20
0207 template<container-compatible-range<charT> R>
0208 constexpr basic_string& append_range(R&& rg); // C++23
0209 basic_string& append(initializer_list<value_type>); // constexpr since C++20
0210
0211 void push_back(value_type c); // constexpr since C++20
0212 void pop_back(); // constexpr since C++20
0213 reference front(); // constexpr since C++20
0214 const_reference front() const; // constexpr since C++20
0215 reference back(); // constexpr since C++20
0216 const_reference back() const; // constexpr since C++20
0217
0218 basic_string& assign(const basic_string& str); // constexpr since C++20
0219 template <class T>
0220 basic_string& assign(const T& t); // C++17, constexpr since C++20
0221 basic_string& assign(basic_string&& str); // constexpr since C++20
0222 basic_string& assign(const basic_string& str, size_type pos, size_type n=npos); // C++14, constexpr since C++20
0223 template <class T>
0224 basic_string& assign(const T& t, size_type pos, size_type n=npos); // C++17, constexpr since C++20
0225 basic_string& assign(const value_type* s, size_type n); // constexpr since C++20
0226 basic_string& assign(const value_type* s); // constexpr since C++20
0227 basic_string& assign(size_type n, value_type c); // constexpr since C++20
0228 template<class InputIterator>
0229 basic_string& assign(InputIterator first, InputIterator last); // constexpr since C++20
0230 template<container-compatible-range<charT> R>
0231 constexpr basic_string& assign_range(R&& rg); // C++23
0232 basic_string& assign(initializer_list<value_type>); // constexpr since C++20
0233
0234 basic_string& insert(size_type pos1, const basic_string& str); // constexpr since C++20
0235 template <class T>
0236 basic_string& insert(size_type pos1, const T& t); // constexpr since C++20
0237 basic_string& insert(size_type pos1, const basic_string& str,
0238 size_type pos2, size_type n); // constexpr since C++20
0239 template <class T>
0240 basic_string& insert(size_type pos1, const T& t, size_type pos2, size_type n); // C++17, constexpr since C++20
0241 basic_string& insert(size_type pos, const value_type* s, size_type n=npos); // C++14, constexpr since C++20
0242 basic_string& insert(size_type pos, const value_type* s); // constexpr since C++20
0243 basic_string& insert(size_type pos, size_type n, value_type c); // constexpr since C++20
0244 iterator insert(const_iterator p, value_type c); // constexpr since C++20
0245 iterator insert(const_iterator p, size_type n, value_type c); // constexpr since C++20
0246 template<class InputIterator>
0247 iterator insert(const_iterator p, InputIterator first, InputIterator last); // constexpr since C++20
0248 template<container-compatible-range<charT> R>
0249 constexpr iterator insert_range(const_iterator p, R&& rg); // C++23
0250 iterator insert(const_iterator p, initializer_list<value_type>); // constexpr since C++20
0251
0252 basic_string& erase(size_type pos = 0, size_type n = npos); // constexpr since C++20
0253 iterator erase(const_iterator position); // constexpr since C++20
0254 iterator erase(const_iterator first, const_iterator last); // constexpr since C++20
0255
0256 basic_string& replace(size_type pos1, size_type n1, const basic_string& str); // constexpr since C++20
0257 template <class T>
0258 basic_string& replace(size_type pos1, size_type n1, const T& t); // C++17, constexpr since C++20
0259 basic_string& replace(size_type pos1, size_type n1, const basic_string& str,
0260 size_type pos2, size_type n2=npos); // C++14, constexpr since C++20
0261 template <class T>
0262 basic_string& replace(size_type pos1, size_type n1, const T& t,
0263 size_type pos2, size_type n); // C++17, constexpr since C++20
0264 basic_string& replace(size_type pos, size_type n1, const value_type* s, size_type n2); // constexpr since C++20
0265 basic_string& replace(size_type pos, size_type n1, const value_type* s); // constexpr since C++20
0266 basic_string& replace(size_type pos, size_type n1, size_type n2, value_type c); // constexpr since C++20
0267 basic_string& replace(const_iterator i1, const_iterator i2, const basic_string& str); // constexpr since C++20
0268 template <class T>
0269 basic_string& replace(const_iterator i1, const_iterator i2, const T& t); // C++17, constexpr since C++20
0270 basic_string& replace(const_iterator i1, const_iterator i2, const value_type* s, size_type n); // constexpr since C++20
0271 basic_string& replace(const_iterator i1, const_iterator i2, const value_type* s); // constexpr since C++20
0272 basic_string& replace(const_iterator i1, const_iterator i2, size_type n, value_type c); // constexpr since C++20
0273 template<class InputIterator>
0274 basic_string& replace(const_iterator i1, const_iterator i2, InputIterator j1, InputIterator j2); // constexpr since C++20
0275 template<container-compatible-range<charT> R>
0276 constexpr basic_string& replace_with_range(const_iterator i1, const_iterator i2, R&& rg); // C++23
0277 basic_string& replace(const_iterator i1, const_iterator i2, initializer_list<value_type>); // constexpr since C++20
0278
0279 size_type copy(value_type* s, size_type n, size_type pos = 0) const; // constexpr since C++20
0280 basic_string substr(size_type pos = 0, size_type n = npos) const; // constexpr in C++20, removed in C++23
0281 basic_string substr(size_type pos = 0, size_type n = npos) const&; // since C++23
0282 constexpr basic_string substr(size_type pos = 0, size_type n = npos) &&; // since C++23
0283 void swap(basic_string& str)
0284 noexcept(allocator_traits<allocator_type>::propagate_on_container_swap::value ||
0285 allocator_traits<allocator_type>::is_always_equal::value); // C++17, constexpr since C++20
0286
0287 const value_type* c_str() const noexcept; // constexpr since C++20
0288 const value_type* data() const noexcept; // constexpr since C++20
0289 value_type* data() noexcept; // C++17, constexpr since C++20
0290
0291 allocator_type get_allocator() const noexcept; // constexpr since C++20
0292
0293 size_type find(const basic_string& str, size_type pos = 0) const noexcept; // constexpr since C++20
0294 template <class T>
0295 size_type find(const T& t, size_type pos = 0) const noexcept; // C++17, noexcept as an extension, constexpr since C++20
0296 size_type find(const value_type* s, size_type pos, size_type n) const noexcept; // constexpr since C++20
0297 size_type find(const value_type* s, size_type pos = 0) const noexcept; // constexpr since C++20
0298 size_type find(value_type c, size_type pos = 0) const noexcept; // constexpr since C++20
0299
0300 size_type rfind(const basic_string& str, size_type pos = npos) const noexcept; // constexpr since C++20
0301 template <class T>
0302 size_type rfind(const T& t, size_type pos = npos) const noexcept; // C++17, noexcept as an extension, constexpr since C++20
0303 size_type rfind(const value_type* s, size_type pos, size_type n) const noexcept; // constexpr since C++20
0304 size_type rfind(const value_type* s, size_type pos = npos) const noexcept; // constexpr since C++20
0305 size_type rfind(value_type c, size_type pos = npos) const noexcept; // constexpr since C++20
0306
0307 size_type find_first_of(const basic_string& str, size_type pos = 0) const noexcept; // constexpr since C++20
0308 template <class T>
0309 size_type find_first_of(const T& t, size_type pos = 0) const noexcept; // C++17, noexcept as an extension, constexpr since C++20
0310 size_type find_first_of(const value_type* s, size_type pos, size_type n) const noexcept; // constexpr since C++20
0311 size_type find_first_of(const value_type* s, size_type pos = 0) const noexcept; // constexpr since C++20
0312 size_type find_first_of(value_type c, size_type pos = 0) const noexcept; // constexpr since C++20
0313
0314 size_type find_last_of(const basic_string& str, size_type pos = npos) const noexcept; // constexpr since C++20
0315 template <class T>
0316 size_type find_last_of(const T& t, size_type pos = npos) const noexcept noexcept; // C++17, noexcept as an extension, constexpr since C++20
0317 size_type find_last_of(const value_type* s, size_type pos, size_type n) const noexcept; // constexpr since C++20
0318 size_type find_last_of(const value_type* s, size_type pos = npos) const noexcept; // constexpr since C++20
0319 size_type find_last_of(value_type c, size_type pos = npos) const noexcept; // constexpr since C++20
0320
0321 size_type find_first_not_of(const basic_string& str, size_type pos = 0) const noexcept; // constexpr since C++20
0322 template <class T>
0323 size_type find_first_not_of(const T& t, size_type pos = 0) const noexcept; // C++17, noexcept as an extension, constexpr since C++20
0324 size_type find_first_not_of(const value_type* s, size_type pos, size_type n) const noexcept; // constexpr since C++20
0325 size_type find_first_not_of(const value_type* s, size_type pos = 0) const noexcept; // constexpr since C++20
0326 size_type find_first_not_of(value_type c, size_type pos = 0) const noexcept; // constexpr since C++20
0327
0328 size_type find_last_not_of(const basic_string& str, size_type pos = npos) const noexcept; // constexpr since C++20
0329 template <class T>
0330 size_type find_last_not_of(const T& t, size_type pos = npos) const noexcept; // C++17, noexcept as an extension, constexpr since C++20
0331 size_type find_last_not_of(const value_type* s, size_type pos, size_type n) const noexcept; // constexpr since C++20
0332 size_type find_last_not_of(const value_type* s, size_type pos = npos) const noexcept; // constexpr since C++20
0333 size_type find_last_not_of(value_type c, size_type pos = npos) const noexcept; // constexpr since C++20
0334
0335 int compare(const basic_string& str) const noexcept; // constexpr since C++20
0336 template <class T>
0337 int compare(const T& t) const noexcept; // C++17, noexcept as an extension, constexpr since C++20
0338 int compare(size_type pos1, size_type n1, const basic_string& str) const; // constexpr since C++20
0339 template <class T>
0340 int compare(size_type pos1, size_type n1, const T& t) const; // C++17, constexpr since C++20
0341 int compare(size_type pos1, size_type n1, const basic_string& str,
0342 size_type pos2, size_type n2=npos) const; // C++14, constexpr since C++20
0343 template <class T>
0344 int compare(size_type pos1, size_type n1, const T& t,
0345 size_type pos2, size_type n2=npos) const; // C++17, constexpr since C++20
0346 int compare(const value_type* s) const noexcept; // constexpr since C++20
0347 int compare(size_type pos1, size_type n1, const value_type* s) const; // constexpr since C++20
0348 int compare(size_type pos1, size_type n1, const value_type* s, size_type n2) const; // constexpr since C++20
0349
0350 constexpr bool starts_with(basic_string_view<charT, traits> sv) const noexcept; // C++20
0351 constexpr bool starts_with(charT c) const noexcept; // C++20
0352 constexpr bool starts_with(const charT* s) const; // C++20
0353 constexpr bool ends_with(basic_string_view<charT, traits> sv) const noexcept; // C++20
0354 constexpr bool ends_with(charT c) const noexcept; // C++20
0355 constexpr bool ends_with(const charT* s) const; // C++20
0356
0357 constexpr bool contains(basic_string_view<charT, traits> sv) const noexcept; // C++23
0358 constexpr bool contains(charT c) const noexcept; // C++23
0359 constexpr bool contains(const charT* s) const; // C++23
0360 };
0361
0362 template<class InputIterator,
0363 class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>>
0364 basic_string(InputIterator, InputIterator, Allocator = Allocator())
0365 -> basic_string<typename iterator_traits<InputIterator>::value_type,
0366 char_traits<typename iterator_traits<InputIterator>::value_type>,
0367 Allocator>; // C++17
0368
0369 template<ranges::input_range R,
0370 class Allocator = allocator<ranges::range_value_t<R>>>
0371 basic_string(from_range_t, R&&, Allocator = Allocator())
0372 -> basic_string<ranges::range_value_t<R>, char_traits<ranges::range_value_t<R>>,
0373 Allocator>; // C++23
0374
0375 template<class charT,
0376 class traits,
0377 class Allocator = allocator<charT>>
0378 explicit basic_string(basic_string_view<charT, traits>, const Allocator& = Allocator())
0379 -> basic_string<charT, traits, Allocator>; // C++17
0380
0381 template<class charT,
0382 class traits,
0383 class Allocator = allocator<charT>>
0384 basic_string(basic_string_view<charT, traits>,
0385 typename see below::size_type, typename see below::size_type,
0386 const Allocator& = Allocator())
0387 -> basic_string<charT, traits, Allocator>; // C++17
0388
0389 template<class charT, class traits, class Allocator>
0390 basic_string<charT, traits, Allocator>
0391 operator+(const basic_string<charT, traits, Allocator>& lhs,
0392 const basic_string<charT, traits, Allocator>& rhs); // constexpr since C++20
0393
0394 template<class charT, class traits, class Allocator>
0395 basic_string<charT, traits, Allocator>
0396 operator+(const charT* lhs , const basic_string<charT,traits,Allocator>&rhs); // constexpr since C++20
0397
0398 template<class charT, class traits, class Allocator>
0399 basic_string<charT, traits, Allocator>
0400 operator+(charT lhs, const basic_string<charT,traits,Allocator>& rhs); // constexpr since C++20
0401
0402 template<class charT, class traits, class Allocator>
0403 basic_string<charT, traits, Allocator>
0404 operator+(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs); // constexpr since C++20
0405
0406 template<class charT, class traits, class Allocator>
0407 basic_string<charT, traits, Allocator>
0408 operator+(const basic_string<charT, traits, Allocator>& lhs, charT rhs); // constexpr since C++20
0409
0410 template<class charT, class traits, class Allocator>
0411 constexpr basic_string<charT, traits, Allocator>
0412 operator+(const basic_string<charT, traits, Allocator>& lhs,
0413 type_identity_t<basic_string_view<charT, traits>> rhs); // Since C++26
0414 template<class charT, class traits, class Allocator>
0415 constexpr basic_string<charT, traits, Allocator>
0416 operator+(basic_string<charT, traits, Allocator>&& lhs,
0417 type_identity_t<basic_string_view<charT, traits>> rhs); // Since C++26
0418 template<class charT, class traits, class Allocator>
0419 constexpr basic_string<charT, traits, Allocator>
0420 operator+(type_identity_t<basic_string_view<charT, traits>> lhs,
0421 const basic_string<charT, traits, Allocator>& rhs); // Since C++26
0422 template<class charT, class traits, class Allocator>
0423 constexpr basic_string<charT, traits, Allocator>
0424 operator+(type_identity_t<basic_string_view<charT, traits>> lhs,
0425 basic_string<charT, traits, Allocator>&& rhs); // Since C++26
0426
0427
0428 template<class charT, class traits, class Allocator>
0429 bool operator==(const basic_string<charT, traits, Allocator>& lhs,
0430 const basic_string<charT, traits, Allocator>& rhs) noexcept; // constexpr since C++20
0431
0432 template<class charT, class traits, class Allocator>
0433 bool operator==(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20
0434
0435 template<class charT, class traits, class Allocator>
0436 bool operator==(const basic_string<charT,traits,Allocator>& lhs, const charT* rhs) noexcept; // constexpr since C++20
0437
0438 template<class charT, class traits, class Allocator>
0439 bool operator!=(const basic_string<charT,traits,Allocator>& lhs,
0440 const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20
0441
0442 template<class charT, class traits, class Allocator>
0443 bool operator!=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20
0444
0445 template<class charT, class traits, class Allocator>
0446 bool operator!=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept; // removed in C++20
0447
0448 template<class charT, class traits, class Allocator>
0449 bool operator< (const basic_string<charT, traits, Allocator>& lhs,
0450 const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20
0451
0452 template<class charT, class traits, class Allocator>
0453 bool operator< (const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept; // removed in C++20
0454
0455 template<class charT, class traits, class Allocator>
0456 bool operator< (const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20
0457
0458 template<class charT, class traits, class Allocator>
0459 bool operator> (const basic_string<charT, traits, Allocator>& lhs,
0460 const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20
0461
0462 template<class charT, class traits, class Allocator>
0463 bool operator> (const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept; // removed in C++20
0464
0465 template<class charT, class traits, class Allocator>
0466 bool operator> (const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20
0467
0468 template<class charT, class traits, class Allocator>
0469 bool operator<=(const basic_string<charT, traits, Allocator>& lhs,
0470 const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20
0471
0472 template<class charT, class traits, class Allocator>
0473 bool operator<=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept; // removed in C++20
0474
0475 template<class charT, class traits, class Allocator>
0476 bool operator<=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20
0477
0478 template<class charT, class traits, class Allocator>
0479 bool operator>=(const basic_string<charT, traits, Allocator>& lhs,
0480 const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20
0481
0482 template<class charT, class traits, class Allocator>
0483 bool operator>=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept; // removed in C++20
0484
0485 template<class charT, class traits, class Allocator>
0486 bool operator>=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20
0487
0488 template<class charT, class traits, class Allocator> // since C++20
0489 constexpr see below operator<=>(const basic_string<charT, traits, Allocator>& lhs,
0490 const basic_string<charT, traits, Allocator>& rhs) noexcept;
0491
0492 template<class charT, class traits, class Allocator> // since C++20
0493 constexpr see below operator<=>(const basic_string<charT, traits, Allocator>& lhs,
0494 const charT* rhs) noexcept;
0495
0496 template<class charT, class traits, class Allocator>
0497 void swap(basic_string<charT, traits, Allocator>& lhs,
0498 basic_string<charT, traits, Allocator>& rhs)
0499 noexcept(noexcept(lhs.swap(rhs))); // constexpr since C++20
0500
0501 template<class charT, class traits, class Allocator>
0502 basic_istream<charT, traits>&
0503 operator>>(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str);
0504
0505 template<class charT, class traits, class Allocator>
0506 basic_ostream<charT, traits>&
0507 operator<<(basic_ostream<charT, traits>& os, const basic_string<charT, traits, Allocator>& str);
0508
0509 template<class charT, class traits, class Allocator>
0510 basic_istream<charT, traits>&
0511 getline(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str,
0512 charT delim);
0513
0514 template<class charT, class traits, class Allocator>
0515 basic_istream<charT, traits>&
0516 getline(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str);
0517
0518 template<class charT, class traits, class Allocator, class U>
0519 typename basic_string<charT, traits, Allocator>::size_type
0520 erase(basic_string<charT, traits, Allocator>& c, const U& value); // C++20
0521 template<class charT, class traits, class Allocator, class Predicate>
0522 typename basic_string<charT, traits, Allocator>::size_type
0523 erase_if(basic_string<charT, traits, Allocator>& c, Predicate pred); // C++20
0524
0525 typedef basic_string<char> string;
0526 typedef basic_string<wchar_t> wstring;
0527 typedef basic_string<char8_t> u8string; // C++20
0528 typedef basic_string<char16_t> u16string;
0529 typedef basic_string<char32_t> u32string;
0530
0531 int stoi (const string& str, size_t* idx = nullptr, int base = 10);
0532 long stol (const string& str, size_t* idx = nullptr, int base = 10);
0533 unsigned long stoul (const string& str, size_t* idx = nullptr, int base = 10);
0534 long long stoll (const string& str, size_t* idx = nullptr, int base = 10);
0535 unsigned long long stoull(const string& str, size_t* idx = nullptr, int base = 10);
0536
0537 float stof (const string& str, size_t* idx = nullptr);
0538 double stod (const string& str, size_t* idx = nullptr);
0539 long double stold(const string& str, size_t* idx = nullptr);
0540
0541 string to_string(int val);
0542 string to_string(unsigned val);
0543 string to_string(long val);
0544 string to_string(unsigned long val);
0545 string to_string(long long val);
0546 string to_string(unsigned long long val);
0547 string to_string(float val);
0548 string to_string(double val);
0549 string to_string(long double val);
0550
0551 int stoi (const wstring& str, size_t* idx = nullptr, int base = 10);
0552 long stol (const wstring& str, size_t* idx = nullptr, int base = 10);
0553 unsigned long stoul (const wstring& str, size_t* idx = nullptr, int base = 10);
0554 long long stoll (const wstring& str, size_t* idx = nullptr, int base = 10);
0555 unsigned long long stoull(const wstring& str, size_t* idx = nullptr, int base = 10);
0556
0557 float stof (const wstring& str, size_t* idx = nullptr);
0558 double stod (const wstring& str, size_t* idx = nullptr);
0559 long double stold(const wstring& str, size_t* idx = nullptr);
0560
0561 wstring to_wstring(int val);
0562 wstring to_wstring(unsigned val);
0563 wstring to_wstring(long val);
0564 wstring to_wstring(unsigned long val);
0565 wstring to_wstring(long long val);
0566 wstring to_wstring(unsigned long long val);
0567 wstring to_wstring(float val);
0568 wstring to_wstring(double val);
0569 wstring to_wstring(long double val);
0570
0571 template <> struct hash<string>;
0572 template <> struct hash<u8string>; // C++20
0573 template <> struct hash<u16string>;
0574 template <> struct hash<u32string>;
0575 template <> struct hash<wstring>;
0576
0577 basic_string<char> operator""s( const char *str, size_t len ); // C++14, constexpr since C++20
0578 basic_string<wchar_t> operator""s( const wchar_t *str, size_t len ); // C++14, constexpr since C++20
0579 constexpr basic_string<char8_t> operator""s( const char8_t *str, size_t len ); // C++20
0580 basic_string<char16_t> operator""s( const char16_t *str, size_t len ); // C++14, constexpr since C++20
0581 basic_string<char32_t> operator""s( const char32_t *str, size_t len ); // C++14, constexpr since C++20
0582
0583 } // std
0584
0585 */
0586
0587 // clang-format on
0588
0589 #include <__cxx03/__algorithm/max.h>
0590 #include <__cxx03/__algorithm/min.h>
0591 #include <__cxx03/__algorithm/remove.h>
0592 #include <__cxx03/__algorithm/remove_if.h>
0593 #include <__cxx03/__assert>
0594 #include <__cxx03/__config>
0595 #include <__cxx03/__debug_utils/sanitizers.h>
0596 #include <__cxx03/__format/enable_insertable.h>
0597 #include <__cxx03/__functional/hash.h>
0598 #include <__cxx03/__functional/unary_function.h>
0599 #include <__cxx03/__fwd/string.h>
0600 #include <__cxx03/__ios/fpos.h>
0601 #include <__cxx03/__iterator/bounded_iter.h>
0602 #include <__cxx03/__iterator/distance.h>
0603 #include <__cxx03/__iterator/iterator_traits.h>
0604 #include <__cxx03/__iterator/reverse_iterator.h>
0605 #include <__cxx03/__iterator/wrap_iter.h>
0606 #include <__cxx03/__memory/addressof.h>
0607 #include <__cxx03/__memory/allocate_at_least.h>
0608 #include <__cxx03/__memory/allocator.h>
0609 #include <__cxx03/__memory/allocator_traits.h>
0610 #include <__cxx03/__memory/compressed_pair.h>
0611 #include <__cxx03/__memory/construct_at.h>
0612 #include <__cxx03/__memory/pointer_traits.h>
0613 #include <__cxx03/__memory/swap_allocator.h>
0614 #include <__cxx03/__memory_resource/polymorphic_allocator.h>
0615 #include <__cxx03/__ranges/access.h>
0616 #include <__cxx03/__ranges/concepts.h>
0617 #include <__cxx03/__ranges/container_compatible_range.h>
0618 #include <__cxx03/__ranges/from_range.h>
0619 #include <__cxx03/__ranges/size.h>
0620 #include <__cxx03/__string/char_traits.h>
0621 #include <__cxx03/__string/extern_template_lists.h>
0622 #include <__cxx03/__type_traits/conditional.h>
0623 #include <__cxx03/__type_traits/is_allocator.h>
0624 #include <__cxx03/__type_traits/is_array.h>
0625 #include <__cxx03/__type_traits/is_convertible.h>
0626 #include <__cxx03/__type_traits/is_nothrow_assignable.h>
0627 #include <__cxx03/__type_traits/is_nothrow_constructible.h>
0628 #include <__cxx03/__type_traits/is_same.h>
0629 #include <__cxx03/__type_traits/is_standard_layout.h>
0630 #include <__cxx03/__type_traits/is_trivial.h>
0631 #include <__cxx03/__type_traits/is_trivially_relocatable.h>
0632 #include <__cxx03/__type_traits/noexcept_move_assign_container.h>
0633 #include <__cxx03/__type_traits/remove_cvref.h>
0634 #include <__cxx03/__type_traits/void_t.h>
0635 #include <__cxx03/__utility/auto_cast.h>
0636 #include <__cxx03/__utility/declval.h>
0637 #include <__cxx03/__utility/forward.h>
0638 #include <__cxx03/__utility/is_pointer_in_range.h>
0639 #include <__cxx03/__utility/move.h>
0640 #include <__cxx03/__utility/swap.h>
0641 #include <__cxx03/__utility/unreachable.h>
0642 #include <__cxx03/climits>
0643 #include <__cxx03/cstdio> // EOF
0644 #include <__cxx03/cstring>
0645 #include <__cxx03/limits>
0646 #include <__cxx03/stdexcept>
0647 #include <__cxx03/string_view>
0648 #include <__cxx03/version>
0649
0650 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
0651 # include <__cxx03/cwchar>
0652 #endif
0653
0654 // standard-mandated includes
0655
0656 // [iterator.range]
0657 #include <__cxx03/__iterator/access.h>
0658 #include <__cxx03/__iterator/data.h>
0659 #include <__cxx03/__iterator/empty.h>
0660 #include <__cxx03/__iterator/reverse_access.h>
0661 #include <__cxx03/__iterator/size.h>
0662
0663 // [string.syn]
0664 #include <__cxx03/compare>
0665 #include <__cxx03/initializer_list>
0666
0667 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0668 # pragma GCC system_header
0669 #endif
0670
0671 _LIBCPP_PUSH_MACROS
0672 #include <__cxx03/__undef_macros>
0673
0674 #if !defined(_LIBCPP_HAS_NO_ASAN) && defined(_LIBCPP_INSTRUMENTED_WITH_ASAN)
0675 # define _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS __attribute__((__no_sanitize__("address")))
0676 // This macro disables AddressSanitizer (ASan) instrumentation for a specific function,
0677 // allowing memory accesses that would normally trigger ASan errors to proceed without crashing.
0678 // This is useful for accessing parts of objects memory, which should not be accessed,
0679 // such as unused bytes in short strings, that should never be accessed
0680 // by other parts of the program.
0681 #else
0682 # define _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS
0683 #endif
0684
0685 _LIBCPP_BEGIN_NAMESPACE_STD
0686
0687 // basic_string
0688
0689 template <class _CharT, class _Traits, class _Allocator>
0690 basic_string<_CharT, _Traits, _Allocator> _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
0691 operator+(const basic_string<_CharT, _Traits, _Allocator>& __x, const basic_string<_CharT, _Traits, _Allocator>& __y);
0692
0693 template <class _CharT, class _Traits, class _Allocator>
0694 _LIBCPP_HIDDEN _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
0695 operator+(const _CharT* __x, const basic_string<_CharT, _Traits, _Allocator>& __y);
0696
0697 template <class _CharT, class _Traits, class _Allocator>
0698 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
0699 operator+(_CharT __x, const basic_string<_CharT, _Traits, _Allocator>& __y);
0700
0701 template <class _CharT, class _Traits, class _Allocator>
0702 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
0703 operator+(const basic_string<_CharT, _Traits, _Allocator>& __x, const _CharT* __y);
0704
0705 template <class _CharT, class _Traits, class _Allocator>
0706 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
0707 operator+(const basic_string<_CharT, _Traits, _Allocator>& __x, _CharT __y);
0708
0709 #if _LIBCPP_STD_VER >= 26
0710
0711 template <class _CharT, class _Traits, class _Allocator>
0712 _LIBCPP_HIDE_FROM_ABI constexpr basic_string<_CharT, _Traits, _Allocator>
0713 operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
0714 type_identity_t<basic_string_view<_CharT, _Traits>> __rhs);
0715
0716 template <class _CharT, class _Traits, class _Allocator>
0717 _LIBCPP_HIDE_FROM_ABI constexpr basic_string<_CharT, _Traits, _Allocator>
0718 operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, type_identity_t<basic_string_view<_CharT, _Traits>> __rhs);
0719
0720 template <class _CharT, class _Traits, class _Allocator>
0721 _LIBCPP_HIDE_FROM_ABI constexpr basic_string<_CharT, _Traits, _Allocator>
0722 operator+(type_identity_t<basic_string_view<_CharT, _Traits>> __lhs,
0723 const basic_string<_CharT, _Traits, _Allocator>& __rhs);
0724
0725 template <class _CharT, class _Traits, class _Allocator>
0726 _LIBCPP_HIDE_FROM_ABI constexpr basic_string<_CharT, _Traits, _Allocator>
0727 operator+(type_identity_t<basic_string_view<_CharT, _Traits>> __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs);
0728
0729 #endif
0730
0731 extern template _LIBCPP_EXPORTED_FROM_ABI string operator+
0732 <char, char_traits<char>, allocator<char> >(char const*, string const&);
0733
0734 template <class _Iter>
0735 struct __string_is_trivial_iterator : public false_type {};
0736
0737 template <class _Tp>
0738 struct __string_is_trivial_iterator<_Tp*> : public is_arithmetic<_Tp> {};
0739
0740 template <class _Iter>
0741 struct __string_is_trivial_iterator<__wrap_iter<_Iter> > : public __string_is_trivial_iterator<_Iter> {};
0742
0743 template <class _CharT, class _Traits, class _Tp>
0744 struct __can_be_converted_to_string_view
0745 : public _BoolConstant< is_convertible<const _Tp&, basic_string_view<_CharT, _Traits> >::value &&
0746 !is_convertible<const _Tp&, const _CharT*>::value > {};
0747
0748 struct __uninitialized_size_tag {};
0749 struct __init_with_sentinel_tag {};
0750
0751 template <class _CharT, class _Traits, class _Allocator>
0752 class basic_string {
0753 private:
0754 using __default_allocator_type = allocator<_CharT>;
0755
0756 public:
0757 typedef basic_string __self;
0758 typedef basic_string_view<_CharT, _Traits> __self_view;
0759 typedef _Traits traits_type;
0760 typedef _CharT value_type;
0761 typedef _Allocator allocator_type;
0762 typedef allocator_traits<allocator_type> __alloc_traits;
0763 typedef typename __alloc_traits::size_type size_type;
0764 typedef typename __alloc_traits::difference_type difference_type;
0765 typedef value_type& reference;
0766 typedef const value_type& const_reference;
0767 typedef typename __alloc_traits::pointer pointer;
0768 typedef typename __alloc_traits::const_pointer const_pointer;
0769
0770 // A basic_string contains the following members which may be trivially relocatable:
0771 // - pointer: is currently assumed to be trivially relocatable, but is still checked in case that changes
0772 // - size_type: is always trivially relocatable, since it has to be an integral type
0773 // - value_type: is always trivially relocatable, since it has to be trivial
0774 // - unsigned char: is a fundamental type, so it's trivially relocatable
0775 // - allocator_type: may or may not be trivially relocatable, so it's checked
0776 //
0777 // This string implementation doesn't contain any references into itself. It only contains a bit that says whether
0778 // it is in small or large string mode, so the entire structure is trivially relocatable if its members are.
0779 #if !defined(_LIBCPP_HAS_NO_ASAN) && defined(_LIBCPP_INSTRUMENTED_WITH_ASAN)
0780 // When compiling with AddressSanitizer (ASan), basic_string cannot be trivially
0781 // relocatable. Because the object's memory might be poisoned when its content
0782 // is kept inside objects memory (short string optimization), instead of in allocated
0783 // external memory. In such cases, the destructor is responsible for unpoisoning
0784 // the memory to avoid triggering false positives.
0785 // Therefore it's crucial to ensure the destructor is called.
0786 using __trivially_relocatable = void;
0787 #else
0788 using __trivially_relocatable = __conditional_t<
0789 __libcpp_is_trivially_relocatable<allocator_type>::value && __libcpp_is_trivially_relocatable<pointer>::value,
0790 basic_string,
0791 void>;
0792 #endif
0793 #if !defined(_LIBCPP_HAS_NO_ASAN) && defined(_LIBCPP_INSTRUMENTED_WITH_ASAN)
0794 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pointer __asan_volatile_wrapper(pointer const& __ptr) const {
0795 if (__libcpp_is_constant_evaluated())
0796 return __ptr;
0797
0798 pointer volatile __copy_ptr = __ptr;
0799
0800 return const_cast<pointer&>(__copy_ptr);
0801 }
0802
0803 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_pointer
0804 __asan_volatile_wrapper(const_pointer const& __ptr) const {
0805 if (__libcpp_is_constant_evaluated())
0806 return __ptr;
0807
0808 const_pointer volatile __copy_ptr = __ptr;
0809
0810 return const_cast<const_pointer&>(__copy_ptr);
0811 }
0812 # define _LIBCPP_ASAN_VOLATILE_WRAPPER(PTR) __asan_volatile_wrapper(PTR)
0813 #else
0814 # define _LIBCPP_ASAN_VOLATILE_WRAPPER(PTR) PTR
0815 #endif
0816
0817 static_assert(!is_array<value_type>::value, "Character type of basic_string must not be an array");
0818 static_assert(is_standard_layout<value_type>::value, "Character type of basic_string must be standard-layout");
0819 static_assert(is_trivial<value_type>::value, "Character type of basic_string must be trivial");
0820 static_assert(is_same<_CharT, typename traits_type::char_type>::value,
0821 "traits_type::char_type must be the same type as CharT");
0822 static_assert(is_same<typename allocator_type::value_type, value_type>::value,
0823 "Allocator::value_type must be same type as value_type");
0824 static_assert(__check_valid_allocator<allocator_type>::value, "");
0825
0826 #ifdef _LIBCPP_ABI_BOUNDED_ITERATORS_IN_STRING
0827 // Users might provide custom allocators, and prior to C++20 we have no existing way to detect whether the allocator's
0828 // pointer type is contiguous (though it has to be by the Standard). Using the wrapper type ensures the iterator is
0829 // considered contiguous.
0830 typedef __bounded_iter<__wrap_iter<pointer>> iterator;
0831 typedef __bounded_iter<__wrap_iter<const_pointer>> const_iterator;
0832 #else
0833 typedef __wrap_iter<pointer> iterator;
0834 typedef __wrap_iter<const_pointer> const_iterator;
0835 #endif
0836 typedef std::reverse_iterator<iterator> reverse_iterator;
0837 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
0838
0839 private:
0840 static_assert(CHAR_BIT == 8, "This implementation assumes that one byte contains 8 bits");
0841
0842 #ifdef _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
0843
0844 struct __long {
0845 pointer __data_;
0846 size_type __size_;
0847 size_type __cap_ : sizeof(size_type) * CHAR_BIT - 1;
0848 size_type __is_long_ : 1;
0849 };
0850
0851 enum { __min_cap = (sizeof(__long) - 1) / sizeof(value_type) > 2 ? (sizeof(__long) - 1) / sizeof(value_type) : 2 };
0852
0853 struct __short {
0854 value_type __data_[__min_cap];
0855 unsigned char __padding_[sizeof(value_type) - 1];
0856 unsigned char __size_ : 7;
0857 unsigned char __is_long_ : 1;
0858 };
0859
0860 // The __endian_factor is required because the field we use to store the size
0861 // has one fewer bit than it would if it were not a bitfield.
0862 //
0863 // If the LSB is used to store the short-flag in the short string representation,
0864 // we have to multiply the size by two when it is stored and divide it by two when
0865 // it is loaded to make sure that we always store an even number. In the long string
0866 // representation, we can ignore this because we can assume that we always allocate
0867 // an even amount of value_types.
0868 //
0869 // If the MSB is used for the short-flag, the max_size() is numeric_limits<size_type>::max() / 2.
0870 // This does not impact the short string representation, since we never need the MSB
0871 // for representing the size of a short string anyway.
0872
0873 # ifdef _LIBCPP_BIG_ENDIAN
0874 static const size_type __endian_factor = 2;
0875 # else
0876 static const size_type __endian_factor = 1;
0877 # endif
0878
0879 #else // _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
0880
0881 # ifdef _LIBCPP_BIG_ENDIAN
0882 static const size_type __endian_factor = 1;
0883 # else
0884 static const size_type __endian_factor = 2;
0885 # endif
0886
0887 // Attribute 'packed' is used to keep the layout compatible with the
0888 // previous definition that did not use bit fields. This is because on
0889 // some platforms bit fields have a default size rather than the actual
0890 // size used, e.g., it is 4 bytes on AIX. See D128285 for details.
0891 struct __long {
0892 struct _LIBCPP_PACKED {
0893 size_type __is_long_ : 1;
0894 size_type __cap_ : sizeof(size_type) * CHAR_BIT - 1;
0895 };
0896 size_type __size_;
0897 pointer __data_;
0898 };
0899
0900 enum { __min_cap = (sizeof(__long) - 1) / sizeof(value_type) > 2 ? (sizeof(__long) - 1) / sizeof(value_type) : 2 };
0901
0902 struct __short {
0903 struct _LIBCPP_PACKED {
0904 unsigned char __is_long_ : 1;
0905 unsigned char __size_ : 7;
0906 };
0907 char __padding_[sizeof(value_type) - 1];
0908 value_type __data_[__min_cap];
0909 };
0910
0911 #endif // _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
0912
0913 static_assert(sizeof(__short) == (sizeof(value_type) * (__min_cap + 1)), "__short has an unexpected size.");
0914
0915 union __rep {
0916 __short __s;
0917 __long __l;
0918 };
0919
0920 __compressed_pair<__rep, allocator_type> __r_;
0921
0922 // Construct a string with the given allocator and enough storage to hold `__size` characters, but
0923 // don't initialize the characters. The contents of the string, including the null terminator, must be
0924 // initialized separately.
0925 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit basic_string(
0926 __uninitialized_size_tag, size_type __size, const allocator_type& __a)
0927 : __r_(__default_init_tag(), __a) {
0928 if (__size > max_size())
0929 __throw_length_error();
0930 if (__fits_in_sso(__size)) {
0931 __r_.first() = __rep();
0932 __set_short_size(__size);
0933 } else {
0934 auto __capacity = __recommend(__size) + 1;
0935 auto __allocation = __alloc_traits::allocate(__alloc(), __capacity);
0936 __begin_lifetime(__allocation, __capacity);
0937 __set_long_cap(__capacity);
0938 __set_long_pointer(__allocation);
0939 __set_long_size(__size);
0940 }
0941 __annotate_new(__size);
0942 }
0943
0944 template <class _Iter, class _Sent>
0945 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
0946 basic_string(__init_with_sentinel_tag, _Iter __first, _Sent __last, const allocator_type& __a)
0947 : __r_(__default_init_tag(), __a) {
0948 __init_with_sentinel(std::move(__first), std::move(__last));
0949 }
0950
0951 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator __make_iterator(pointer __p) {
0952 #ifdef _LIBCPP_ABI_BOUNDED_ITERATORS_IN_STRING
0953 // Bound the iterator according to the size (and not the capacity, unlike vector).
0954 //
0955 // By the Standard, string iterators are generally not guaranteed to stay valid when the container is modified,
0956 // regardless of whether reallocation occurs. This allows us to check for out-of-bounds accesses using logical size,
0957 // a stricter check, since correct code can never rely on being able to access newly-added elements via an existing
0958 // iterator.
0959 return std::__make_bounded_iter(
0960 std::__wrap_iter<pointer>(__p),
0961 std::__wrap_iter<pointer>(__get_pointer()),
0962 std::__wrap_iter<pointer>(__get_pointer() + size()));
0963 #else
0964 return iterator(__p);
0965 #endif // _LIBCPP_ABI_BOUNDED_ITERATORS_IN_STRING
0966 }
0967
0968 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_iterator __make_const_iterator(const_pointer __p) const {
0969 #ifdef _LIBCPP_ABI_BOUNDED_ITERATORS_IN_STRING
0970 // Bound the iterator according to the size (and not the capacity, unlike vector).
0971 return std::__make_bounded_iter(
0972 std::__wrap_iter<const_pointer>(__p),
0973 std::__wrap_iter<const_pointer>(__get_pointer()),
0974 std::__wrap_iter<const_pointer>(__get_pointer() + size()));
0975 #else
0976 return const_iterator(__p);
0977 #endif // _LIBCPP_ABI_BOUNDED_ITERATORS_IN_STRING
0978 }
0979
0980 public:
0981 _LIBCPP_TEMPLATE_DATA_VIS static const size_type npos = -1;
0982
0983 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string()
0984 _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
0985 : __r_(__value_init_tag(), __default_init_tag()) {
0986 __annotate_new(0);
0987 }
0988
0989 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit basic_string(const allocator_type& __a)
0990 #if _LIBCPP_STD_VER <= 14
0991 _NOEXCEPT_(is_nothrow_copy_constructible<allocator_type>::value)
0992 #else
0993 _NOEXCEPT
0994 #endif
0995 : __r_(__value_init_tag(), __a) {
0996 __annotate_new(0);
0997 }
0998
0999 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS basic_string(const basic_string& __str)
1000 : __r_(__default_init_tag(), __alloc_traits::select_on_container_copy_construction(__str.__alloc())) {
1001 if (!__str.__is_long()) {
1002 __r_.first() = __str.__r_.first();
1003 __annotate_new(__get_short_size());
1004 } else
1005 __init_copy_ctor_external(std::__to_address(__str.__get_long_pointer()), __str.__get_long_size());
1006 }
1007
1008 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS
1009 basic_string(const basic_string& __str, const allocator_type& __a)
1010 : __r_(__default_init_tag(), __a) {
1011 if (!__str.__is_long()) {
1012 __r_.first() = __str.__r_.first();
1013 __annotate_new(__get_short_size());
1014 } else
1015 __init_copy_ctor_external(std::__to_address(__str.__get_long_pointer()), __str.__get_long_size());
1016 }
1017
1018 #ifndef _LIBCPP_CXX03_LANG
1019 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(basic_string&& __str)
1020 # if _LIBCPP_STD_VER <= 14
1021 _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
1022 # else
1023 _NOEXCEPT
1024 # endif
1025 // Turning off ASan instrumentation for variable initialization with _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS
1026 // does not work consistently during initialization of __r_, so we instead unpoison __str's memory manually first.
1027 // __str's memory needs to be unpoisoned only in the case where it's a short string.
1028 : __r_([](basic_string& __s) -> decltype(__s.__r_)&& {
1029 if (!__s.__is_long())
1030 __s.__annotate_delete();
1031 return std::move(__s.__r_);
1032 }(__str)) {
1033 __str.__r_.first() = __rep();
1034 __str.__annotate_new(0);
1035 if (!__is_long())
1036 __annotate_new(size());
1037 }
1038
1039 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(basic_string&& __str, const allocator_type& __a)
1040 : __r_(__default_init_tag(), __a) {
1041 if (__str.__is_long() && __a != __str.__alloc()) // copy, not move
1042 __init(std::__to_address(__str.__get_long_pointer()), __str.__get_long_size());
1043 else {
1044 if (__libcpp_is_constant_evaluated())
1045 __r_.first() = __rep();
1046 if (!__str.__is_long())
1047 __str.__annotate_delete();
1048 __r_.first() = __str.__r_.first();
1049 __str.__r_.first() = __rep();
1050 __str.__annotate_new(0);
1051 if (!__is_long() && this != &__str)
1052 __annotate_new(size());
1053 }
1054 }
1055 #endif // _LIBCPP_CXX03_LANG
1056
1057 template <__enable_if_t<__is_allocator<_Allocator>::value, int> = 0>
1058 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(const _CharT* __s)
1059 : __r_(__default_init_tag(), __default_init_tag()) {
1060 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "basic_string(const char*) detected nullptr");
1061 __init(__s, traits_type::length(__s));
1062 }
1063
1064 template <__enable_if_t<__is_allocator<_Allocator>::value, int> = 0>
1065 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(const _CharT* __s, const _Allocator& __a)
1066 : __r_(__default_init_tag(), __a) {
1067 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "basic_string(const char*, allocator) detected nullptr");
1068 __init(__s, traits_type::length(__s));
1069 }
1070
1071 #if _LIBCPP_STD_VER >= 23
1072 basic_string(nullptr_t) = delete;
1073 #endif
1074
1075 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(const _CharT* __s, size_type __n)
1076 : __r_(__default_init_tag(), __default_init_tag()) {
1077 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "basic_string(const char*, n) detected nullptr");
1078 __init(__s, __n);
1079 }
1080
1081 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
1082 basic_string(const _CharT* __s, size_type __n, const _Allocator& __a)
1083 : __r_(__default_init_tag(), __a) {
1084 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "basic_string(const char*, n, allocator) detected nullptr");
1085 __init(__s, __n);
1086 }
1087
1088 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(size_type __n, _CharT __c)
1089 : __r_(__default_init_tag(), __default_init_tag()) {
1090 __init(__n, __c);
1091 }
1092
1093 #if _LIBCPP_STD_VER >= 23
1094 _LIBCPP_HIDE_FROM_ABI constexpr basic_string(
1095 basic_string&& __str, size_type __pos, const _Allocator& __alloc = _Allocator())
1096 : basic_string(std::move(__str), __pos, npos, __alloc) {}
1097
1098 _LIBCPP_HIDE_FROM_ABI constexpr basic_string(
1099 basic_string&& __str, size_type __pos, size_type __n, const _Allocator& __alloc = _Allocator())
1100 : __r_(__default_init_tag(), __alloc) {
1101 if (__pos > __str.size())
1102 __throw_out_of_range();
1103
1104 auto __len = std::min<size_type>(__n, __str.size() - __pos);
1105 if (__alloc_traits::is_always_equal::value || __alloc == __str.__alloc()) {
1106 __move_assign(std::move(__str), __pos, __len);
1107 } else {
1108 // Perform a copy because the allocators are not compatible.
1109 __init(__str.data() + __pos, __len);
1110 }
1111 }
1112 #endif
1113
1114 template <__enable_if_t<__is_allocator<_Allocator>::value, int> = 0>
1115 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(size_type __n, _CharT __c, const _Allocator& __a)
1116 : __r_(__default_init_tag(), __a) {
1117 __init(__n, __c);
1118 }
1119
1120 _LIBCPP_CONSTEXPR_SINCE_CXX20
1121 basic_string(const basic_string& __str, size_type __pos, size_type __n, const _Allocator& __a = _Allocator())
1122 : __r_(__default_init_tag(), __a) {
1123 size_type __str_sz = __str.size();
1124 if (__pos > __str_sz)
1125 __throw_out_of_range();
1126 __init(__str.data() + __pos, std::min(__n, __str_sz - __pos));
1127 }
1128
1129 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
1130 basic_string(const basic_string& __str, size_type __pos, const _Allocator& __a = _Allocator())
1131 : __r_(__default_init_tag(), __a) {
1132 size_type __str_sz = __str.size();
1133 if (__pos > __str_sz)
1134 __throw_out_of_range();
1135 __init(__str.data() + __pos, __str_sz - __pos);
1136 }
1137
1138 template <class _Tp,
1139 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
1140 !__is_same_uncvref<_Tp, basic_string>::value,
1141 int> = 0>
1142 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
1143 basic_string(const _Tp& __t, size_type __pos, size_type __n, const allocator_type& __a = allocator_type())
1144 : __r_(__default_init_tag(), __a) {
1145 __self_view __sv0 = __t;
1146 __self_view __sv = __sv0.substr(__pos, __n);
1147 __init(__sv.data(), __sv.size());
1148 }
1149
1150 template <class _Tp,
1151 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
1152 !__is_same_uncvref<_Tp, basic_string>::value,
1153 int> = 0>
1154 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit basic_string(const _Tp& __t)
1155 : __r_(__default_init_tag(), __default_init_tag()) {
1156 __self_view __sv = __t;
1157 __init(__sv.data(), __sv.size());
1158 }
1159
1160 template <class _Tp,
1161 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
1162 !__is_same_uncvref<_Tp, basic_string>::value,
1163 int> = 0>
1164 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
1165 _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit basic_string(const _Tp& __t, const allocator_type& __a)
1166 : __r_(__default_init_tag(), __a) {
1167 __self_view __sv = __t;
1168 __init(__sv.data(), __sv.size());
1169 }
1170
1171 template <class _InputIterator, __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> = 0>
1172 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(_InputIterator __first, _InputIterator __last)
1173 : __r_(__default_init_tag(), __default_init_tag()) {
1174 __init(__first, __last);
1175 }
1176
1177 template <class _InputIterator, __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> = 0>
1178 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
1179 basic_string(_InputIterator __first, _InputIterator __last, const allocator_type& __a)
1180 : __r_(__default_init_tag(), __a) {
1181 __init(__first, __last);
1182 }
1183
1184 #if _LIBCPP_STD_VER >= 23
1185 template <_ContainerCompatibleRange<_CharT> _Range>
1186 _LIBCPP_HIDE_FROM_ABI constexpr basic_string(
1187 from_range_t, _Range&& __range, const allocator_type& __a = allocator_type())
1188 : __r_(__default_init_tag(), __a) {
1189 if constexpr (ranges::forward_range<_Range> || ranges::sized_range<_Range>) {
1190 __init_with_size(ranges::begin(__range), ranges::end(__range), ranges::distance(__range));
1191 } else {
1192 __init_with_sentinel(ranges::begin(__range), ranges::end(__range));
1193 }
1194 }
1195 #endif
1196
1197 #ifndef _LIBCPP_CXX03_LANG
1198 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(initializer_list<_CharT> __il)
1199 : __r_(__default_init_tag(), __default_init_tag()) {
1200 __init(__il.begin(), __il.end());
1201 }
1202
1203 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(initializer_list<_CharT> __il, const _Allocator& __a)
1204 : __r_(__default_init_tag(), __a) {
1205 __init(__il.begin(), __il.end());
1206 }
1207 #endif // _LIBCPP_CXX03_LANG
1208
1209 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 ~basic_string() {
1210 __annotate_delete();
1211 if (__is_long())
1212 __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
1213 }
1214
1215 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 operator __self_view() const _NOEXCEPT {
1216 return __self_view(data(), size());
1217 }
1218
1219 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS basic_string&
1220 operator=(const basic_string& __str);
1221
1222 template <class _Tp,
1223 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
1224 !__is_same_uncvref<_Tp, basic_string>::value,
1225 int> = 0>
1226 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator=(const _Tp& __t) {
1227 __self_view __sv = __t;
1228 return assign(__sv);
1229 }
1230
1231 #ifndef _LIBCPP_CXX03_LANG
1232 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1233 operator=(basic_string&& __str) noexcept(__noexcept_move_assign_container<_Allocator, __alloc_traits>::value) {
1234 __move_assign(__str, integral_constant<bool, __alloc_traits::propagate_on_container_move_assignment::value>());
1235 return *this;
1236 }
1237
1238 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator=(initializer_list<value_type> __il) {
1239 return assign(__il.begin(), __il.size());
1240 }
1241 #endif
1242 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator=(const value_type* __s) {
1243 return assign(__s);
1244 }
1245 #if _LIBCPP_STD_VER >= 23
1246 basic_string& operator=(nullptr_t) = delete;
1247 #endif
1248 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator=(value_type __c);
1249
1250 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator begin() _NOEXCEPT {
1251 return __make_iterator(__get_pointer());
1252 }
1253 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_iterator begin() const _NOEXCEPT {
1254 return __make_const_iterator(__get_pointer());
1255 }
1256 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator end() _NOEXCEPT {
1257 return __make_iterator(__get_pointer() + size());
1258 }
1259 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_iterator end() const _NOEXCEPT {
1260 return __make_const_iterator(__get_pointer() + size());
1261 }
1262
1263 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 reverse_iterator rbegin() _NOEXCEPT {
1264 return reverse_iterator(end());
1265 }
1266 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reverse_iterator rbegin() const _NOEXCEPT {
1267 return const_reverse_iterator(end());
1268 }
1269 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 reverse_iterator rend() _NOEXCEPT {
1270 return reverse_iterator(begin());
1271 }
1272 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reverse_iterator rend() const _NOEXCEPT {
1273 return const_reverse_iterator(begin());
1274 }
1275
1276 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_iterator cbegin() const _NOEXCEPT { return begin(); }
1277 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_iterator cend() const _NOEXCEPT { return end(); }
1278 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reverse_iterator crbegin() const _NOEXCEPT {
1279 return rbegin();
1280 }
1281 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reverse_iterator crend() const _NOEXCEPT { return rend(); }
1282
1283 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type size() const _NOEXCEPT {
1284 return __is_long() ? __get_long_size() : __get_short_size();
1285 }
1286 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type length() const _NOEXCEPT { return size(); }
1287
1288 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type max_size() const _NOEXCEPT {
1289 size_type __m = __alloc_traits::max_size(__alloc());
1290 if (__m <= std::numeric_limits<size_type>::max() / 2) {
1291 return __m - __alignment;
1292 } else {
1293 bool __uses_lsb = __endian_factor == 2;
1294 return __uses_lsb ? __m - __alignment : (__m / 2) - __alignment;
1295 }
1296 }
1297
1298 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type capacity() const _NOEXCEPT {
1299 return (__is_long() ? __get_long_cap() : static_cast<size_type>(__min_cap)) - 1;
1300 }
1301
1302 _LIBCPP_CONSTEXPR_SINCE_CXX20 void resize(size_type __n, value_type __c);
1303 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void resize(size_type __n) { resize(__n, value_type()); }
1304
1305 _LIBCPP_CONSTEXPR_SINCE_CXX20 void reserve(size_type __requested_capacity);
1306
1307 #if _LIBCPP_STD_VER >= 23
1308 template <class _Op>
1309 _LIBCPP_HIDE_FROM_ABI constexpr void resize_and_overwrite(size_type __n, _Op __op) {
1310 __resize_default_init(__n);
1311 __erase_to_end(std::move(__op)(data(), _LIBCPP_AUTO_CAST(__n)));
1312 }
1313 #endif
1314
1315 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __resize_default_init(size_type __n);
1316
1317 #if _LIBCPP_STD_VER < 26 || defined(_LIBCPP_ENABLE_CXX26_REMOVED_STRING_RESERVE)
1318 _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_HIDE_FROM_ABI void reserve() _NOEXCEPT { shrink_to_fit(); }
1319 #endif
1320 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void shrink_to_fit() _NOEXCEPT;
1321 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void clear() _NOEXCEPT;
1322
1323 _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool empty() const _NOEXCEPT {
1324 return size() == 0;
1325 }
1326
1327 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reference operator[](size_type __pos) const _NOEXCEPT {
1328 _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__pos <= size(), "string index out of bounds");
1329 if (__builtin_constant_p(__pos) && !__fits_in_sso(__pos)) {
1330 return *(__get_long_pointer() + __pos);
1331 }
1332 return *(data() + __pos);
1333 }
1334
1335 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 reference operator[](size_type __pos) _NOEXCEPT {
1336 _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__pos <= size(), "string index out of bounds");
1337 if (__builtin_constant_p(__pos) && !__fits_in_sso(__pos)) {
1338 return *(__get_long_pointer() + __pos);
1339 }
1340 return *(__get_pointer() + __pos);
1341 }
1342
1343 _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reference at(size_type __n) const;
1344 _LIBCPP_CONSTEXPR_SINCE_CXX20 reference at(size_type __n);
1345
1346 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator+=(const basic_string& __str) {
1347 return append(__str);
1348 }
1349
1350 template <class _Tp,
1351 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
1352 !__is_same_uncvref<_Tp, basic_string >::value,
1353 int> = 0>
1354 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1355 operator+=(const _Tp& __t) {
1356 __self_view __sv = __t;
1357 return append(__sv);
1358 }
1359
1360 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator+=(const value_type* __s) {
1361 return append(__s);
1362 }
1363
1364 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator+=(value_type __c) {
1365 push_back(__c);
1366 return *this;
1367 }
1368
1369 #ifndef _LIBCPP_CXX03_LANG
1370 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator+=(initializer_list<value_type> __il) {
1371 return append(__il);
1372 }
1373 #endif // _LIBCPP_CXX03_LANG
1374
1375 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(const basic_string& __str) {
1376 return append(__str.data(), __str.size());
1377 }
1378
1379 template <class _Tp,
1380 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
1381 !__is_same_uncvref<_Tp, basic_string>::value,
1382 int> = 0>
1383 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1384 append(const _Tp& __t) {
1385 __self_view __sv = __t;
1386 return append(__sv.data(), __sv.size());
1387 }
1388
1389 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(const basic_string& __str, size_type __pos, size_type __n = npos);
1390
1391 template <class _Tp,
1392 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
1393 !__is_same_uncvref<_Tp, basic_string>::value,
1394 int> = 0>
1395 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20
1396
1397 basic_string&
1398 append(const _Tp& __t, size_type __pos, size_type __n = npos);
1399
1400 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(const value_type* __s, size_type __n);
1401 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(const value_type* __s);
1402 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(size_type __n, value_type __c);
1403
1404 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __append_default_init(size_type __n);
1405
1406 template <class _InputIterator, __enable_if_t<__has_exactly_input_iterator_category<_InputIterator>::value, int> = 0>
1407 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1408 append(_InputIterator __first, _InputIterator __last) {
1409 const basic_string __temp(__first, __last, __alloc());
1410 append(__temp.data(), __temp.size());
1411 return *this;
1412 }
1413
1414 template <class _ForwardIterator, __enable_if_t<__has_forward_iterator_category<_ForwardIterator>::value, int> = 0>
1415 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1416 append(_ForwardIterator __first, _ForwardIterator __last);
1417
1418 #if _LIBCPP_STD_VER >= 23
1419 template <_ContainerCompatibleRange<_CharT> _Range>
1420 _LIBCPP_HIDE_FROM_ABI constexpr basic_string& append_range(_Range&& __range) {
1421 insert_range(end(), std::forward<_Range>(__range));
1422 return *this;
1423 }
1424 #endif
1425
1426 #ifndef _LIBCPP_CXX03_LANG
1427 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(initializer_list<value_type> __il) {
1428 return append(__il.begin(), __il.size());
1429 }
1430 #endif // _LIBCPP_CXX03_LANG
1431
1432 _LIBCPP_CONSTEXPR_SINCE_CXX20 void push_back(value_type __c);
1433 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void pop_back();
1434
1435 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 reference front() _NOEXCEPT {
1436 _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string::front(): string is empty");
1437 return *__get_pointer();
1438 }
1439
1440 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reference front() const _NOEXCEPT {
1441 _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string::front(): string is empty");
1442 return *data();
1443 }
1444
1445 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 reference back() _NOEXCEPT {
1446 _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string::back(): string is empty");
1447 return *(__get_pointer() + size() - 1);
1448 }
1449
1450 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reference back() const _NOEXCEPT {
1451 _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string::back(): string is empty");
1452 return *(data() + size() - 1);
1453 }
1454
1455 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
1456 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1457 assign(const _Tp& __t) {
1458 __self_view __sv = __t;
1459 return assign(__sv.data(), __sv.size());
1460 }
1461
1462 #if _LIBCPP_STD_VER >= 20
1463 _LIBCPP_HIDE_FROM_ABI constexpr void __move_assign(basic_string&& __str, size_type __pos, size_type __len) {
1464 // Pilfer the allocation from __str.
1465 _LIBCPP_ASSERT_INTERNAL(__alloc() == __str.__alloc(), "__move_assign called with wrong allocator");
1466 size_type __old_sz = __str.size();
1467 if (!__str.__is_long())
1468 __str.__annotate_delete();
1469 __r_.first() = __str.__r_.first();
1470 __str.__r_.first() = __rep();
1471 __str.__annotate_new(0);
1472
1473 _Traits::move(data(), data() + __pos, __len);
1474 __set_size(__len);
1475 _Traits::assign(data()[__len], value_type());
1476
1477 if (!__is_long()) {
1478 __annotate_new(__len);
1479 } else if (__old_sz > __len) {
1480 __annotate_shrink(__old_sz);
1481 }
1482 }
1483 #endif
1484
1485 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(const basic_string& __str) {
1486 return *this = __str;
1487 }
1488 #ifndef _LIBCPP_CXX03_LANG
1489 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1490 assign(basic_string&& __str) noexcept(__noexcept_move_assign_container<_Allocator, __alloc_traits>::value) {
1491 *this = std::move(__str);
1492 return *this;
1493 }
1494 #endif
1495 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(const basic_string& __str, size_type __pos, size_type __n = npos);
1496
1497 template <class _Tp,
1498 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
1499 !__is_same_uncvref<_Tp, basic_string>::value,
1500 int> = 0>
1501 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1502 assign(const _Tp& __t, size_type __pos, size_type __n = npos);
1503
1504 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(const value_type* __s, size_type __n);
1505 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(const value_type* __s);
1506 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(size_type __n, value_type __c);
1507 template <class _InputIterator, __enable_if_t<__has_exactly_input_iterator_category<_InputIterator>::value, int> = 0>
1508 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1509 assign(_InputIterator __first, _InputIterator __last);
1510
1511 template <class _ForwardIterator, __enable_if_t<__has_forward_iterator_category<_ForwardIterator>::value, int> = 0>
1512 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1513 assign(_ForwardIterator __first, _ForwardIterator __last);
1514
1515 #if _LIBCPP_STD_VER >= 23
1516 template <_ContainerCompatibleRange<_CharT> _Range>
1517 _LIBCPP_HIDE_FROM_ABI constexpr basic_string& assign_range(_Range&& __range) {
1518 if constexpr (__string_is_trivial_iterator<ranges::iterator_t<_Range>>::value &&
1519 (ranges::forward_range<_Range> || ranges::sized_range<_Range>)) {
1520 size_type __n = static_cast<size_type>(ranges::distance(__range));
1521 __assign_trivial(ranges::begin(__range), ranges::end(__range), __n);
1522
1523 } else {
1524 __assign_with_sentinel(ranges::begin(__range), ranges::end(__range));
1525 }
1526
1527 return *this;
1528 }
1529 #endif
1530
1531 #ifndef _LIBCPP_CXX03_LANG
1532 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(initializer_list<value_type> __il) {
1533 return assign(__il.begin(), __il.size());
1534 }
1535 #endif // _LIBCPP_CXX03_LANG
1536
1537 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1538 insert(size_type __pos1, const basic_string& __str) {
1539 return insert(__pos1, __str.data(), __str.size());
1540 }
1541
1542 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
1543 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1544 insert(size_type __pos1, const _Tp& __t) {
1545 __self_view __sv = __t;
1546 return insert(__pos1, __sv.data(), __sv.size());
1547 }
1548
1549 template <class _Tp,
1550 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
1551 !__is_same_uncvref<_Tp, basic_string>::value,
1552 int> = 0>
1553 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1554 insert(size_type __pos1, const _Tp& __t, size_type __pos2, size_type __n = npos);
1555
1556 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1557 insert(size_type __pos1, const basic_string& __str, size_type __pos2, size_type __n = npos);
1558 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& insert(size_type __pos, const value_type* __s, size_type __n);
1559 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& insert(size_type __pos, const value_type* __s);
1560 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& insert(size_type __pos, size_type __n, value_type __c);
1561 _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator insert(const_iterator __pos, value_type __c);
1562
1563 #if _LIBCPP_STD_VER >= 23
1564 template <_ContainerCompatibleRange<_CharT> _Range>
1565 _LIBCPP_HIDE_FROM_ABI constexpr iterator insert_range(const_iterator __position, _Range&& __range) {
1566 if constexpr (ranges::forward_range<_Range> || ranges::sized_range<_Range>) {
1567 auto __n = static_cast<size_type>(ranges::distance(__range));
1568 return __insert_with_size(__position, ranges::begin(__range), ranges::end(__range), __n);
1569
1570 } else {
1571 basic_string __temp(from_range, std::forward<_Range>(__range), __alloc());
1572 return insert(__position, __temp.data(), __temp.data() + __temp.size());
1573 }
1574 }
1575 #endif
1576
1577 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator
1578 insert(const_iterator __pos, size_type __n, value_type __c) {
1579 difference_type __p = __pos - begin();
1580 insert(static_cast<size_type>(__p), __n, __c);
1581 return begin() + __p;
1582 }
1583
1584 template <class _InputIterator, __enable_if_t<__has_exactly_input_iterator_category<_InputIterator>::value, int> = 0>
1585 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator
1586 insert(const_iterator __pos, _InputIterator __first, _InputIterator __last);
1587
1588 template <class _ForwardIterator, __enable_if_t<__has_forward_iterator_category<_ForwardIterator>::value, int> = 0>
1589 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator
1590 insert(const_iterator __pos, _ForwardIterator __first, _ForwardIterator __last);
1591
1592 #ifndef _LIBCPP_CXX03_LANG
1593 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator
1594 insert(const_iterator __pos, initializer_list<value_type> __il) {
1595 return insert(__pos, __il.begin(), __il.end());
1596 }
1597 #endif // _LIBCPP_CXX03_LANG
1598
1599 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& erase(size_type __pos = 0, size_type __n = npos);
1600 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator erase(const_iterator __pos);
1601 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator erase(const_iterator __first, const_iterator __last);
1602
1603 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1604 replace(size_type __pos1, size_type __n1, const basic_string& __str) {
1605 return replace(__pos1, __n1, __str.data(), __str.size());
1606 }
1607
1608 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
1609 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1610 replace(size_type __pos1, size_type __n1, const _Tp& __t) {
1611 __self_view __sv = __t;
1612 return replace(__pos1, __n1, __sv.data(), __sv.size());
1613 }
1614
1615 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1616 replace(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2 = npos);
1617
1618 template <class _Tp,
1619 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
1620 !__is_same_uncvref<_Tp, basic_string>::value,
1621 int> = 0>
1622 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1623 replace(size_type __pos1, size_type __n1, const _Tp& __t, size_type __pos2, size_type __n2 = npos);
1624
1625 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1626 replace(size_type __pos, size_type __n1, const value_type* __s, size_type __n2);
1627 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& replace(size_type __pos, size_type __n1, const value_type* __s);
1628 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& replace(size_type __pos, size_type __n1, size_type __n2, value_type __c);
1629
1630 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1631 replace(const_iterator __i1, const_iterator __i2, const basic_string& __str) {
1632 return replace(
1633 static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __str.data(), __str.size());
1634 }
1635
1636 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
1637 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1638 replace(const_iterator __i1, const_iterator __i2, const _Tp& __t) {
1639 __self_view __sv = __t;
1640 return replace(__i1 - begin(), __i2 - __i1, __sv);
1641 }
1642
1643 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1644 replace(const_iterator __i1, const_iterator __i2, const value_type* __s, size_type __n) {
1645 return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __s, __n);
1646 }
1647
1648 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1649 replace(const_iterator __i1, const_iterator __i2, const value_type* __s) {
1650 return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __s);
1651 }
1652
1653 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1654 replace(const_iterator __i1, const_iterator __i2, size_type __n, value_type __c) {
1655 return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __n, __c);
1656 }
1657
1658 template <class _InputIterator, __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> = 0>
1659 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1660 replace(const_iterator __i1, const_iterator __i2, _InputIterator __j1, _InputIterator __j2);
1661
1662 #if _LIBCPP_STD_VER >= 23
1663 template <_ContainerCompatibleRange<_CharT> _Range>
1664 _LIBCPP_HIDE_FROM_ABI constexpr basic_string&
1665 replace_with_range(const_iterator __i1, const_iterator __i2, _Range&& __range) {
1666 basic_string __temp(from_range, std::forward<_Range>(__range), __alloc());
1667 return replace(__i1, __i2, __temp);
1668 }
1669 #endif
1670
1671 #ifndef _LIBCPP_CXX03_LANG
1672 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
1673 replace(const_iterator __i1, const_iterator __i2, initializer_list<value_type> __il) {
1674 return replace(__i1, __i2, __il.begin(), __il.end());
1675 }
1676 #endif // _LIBCPP_CXX03_LANG
1677
1678 _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type copy(value_type* __s, size_type __n, size_type __pos = 0) const;
1679
1680 #if _LIBCPP_STD_VER <= 20
1681 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string
1682 substr(size_type __pos = 0, size_type __n = npos) const {
1683 return basic_string(*this, __pos, __n);
1684 }
1685 #else
1686 _LIBCPP_HIDE_FROM_ABI constexpr basic_string substr(size_type __pos = 0, size_type __n = npos) const& {
1687 return basic_string(*this, __pos, __n);
1688 }
1689
1690 _LIBCPP_HIDE_FROM_ABI constexpr basic_string substr(size_type __pos = 0, size_type __n = npos) && {
1691 return basic_string(std::move(*this), __pos, __n);
1692 }
1693 #endif
1694
1695 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(basic_string& __str)
1696 #if _LIBCPP_STD_VER >= 14
1697 _NOEXCEPT;
1698 #else
1699 _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value || __is_nothrow_swappable_v<allocator_type>);
1700 #endif
1701
1702 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const value_type* c_str() const _NOEXCEPT { return data(); }
1703 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const value_type* data() const _NOEXCEPT {
1704 return std::__to_address(__get_pointer());
1705 }
1706 #if _LIBCPP_STD_VER >= 17
1707 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 value_type* data() _NOEXCEPT {
1708 return std::__to_address(__get_pointer());
1709 }
1710 #endif
1711
1712 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 allocator_type get_allocator() const _NOEXCEPT {
1713 return __alloc();
1714 }
1715
1716 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1717 find(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
1718
1719 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
1720 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1721 find(const _Tp& __t, size_type __pos = 0) const _NOEXCEPT;
1722
1723 _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type find(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
1724 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1725 find(const value_type* __s, size_type __pos = 0) const _NOEXCEPT;
1726 _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type find(value_type __c, size_type __pos = 0) const _NOEXCEPT;
1727
1728 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1729 rfind(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
1730
1731 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
1732 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1733 rfind(const _Tp& __t, size_type __pos = npos) const _NOEXCEPT;
1734
1735 _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type rfind(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
1736 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1737 rfind(const value_type* __s, size_type __pos = npos) const _NOEXCEPT;
1738 _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type rfind(value_type __c, size_type __pos = npos) const _NOEXCEPT;
1739
1740 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1741 find_first_of(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
1742
1743 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
1744 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1745 find_first_of(const _Tp& __t, size_type __pos = 0) const _NOEXCEPT;
1746
1747 _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1748 find_first_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
1749 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1750 find_first_of(const value_type* __s, size_type __pos = 0) const _NOEXCEPT;
1751 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1752 find_first_of(value_type __c, size_type __pos = 0) const _NOEXCEPT;
1753
1754 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1755 find_last_of(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
1756
1757 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
1758 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1759 find_last_of(const _Tp& __t, size_type __pos = npos) const _NOEXCEPT;
1760
1761 _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1762 find_last_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
1763 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1764 find_last_of(const value_type* __s, size_type __pos = npos) const _NOEXCEPT;
1765 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1766 find_last_of(value_type __c, size_type __pos = npos) const _NOEXCEPT;
1767
1768 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1769 find_first_not_of(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
1770
1771 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
1772 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1773 find_first_not_of(const _Tp& __t, size_type __pos = 0) const _NOEXCEPT;
1774
1775 _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1776 find_first_not_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
1777 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1778 find_first_not_of(const value_type* __s, size_type __pos = 0) const _NOEXCEPT;
1779 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1780 find_first_not_of(value_type __c, size_type __pos = 0) const _NOEXCEPT;
1781
1782 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1783 find_last_not_of(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
1784
1785 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
1786 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1787 find_last_not_of(const _Tp& __t, size_type __pos = npos) const _NOEXCEPT;
1788
1789 _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1790 find_last_not_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
1791 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1792 find_last_not_of(const value_type* __s, size_type __pos = npos) const _NOEXCEPT;
1793 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type
1794 find_last_not_of(value_type __c, size_type __pos = npos) const _NOEXCEPT;
1795
1796 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 int compare(const basic_string& __str) const _NOEXCEPT;
1797
1798 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
1799 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 int
1800 compare(const _Tp& __t) const _NOEXCEPT;
1801
1802 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> = 0>
1803 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS _LIBCPP_CONSTEXPR_SINCE_CXX20 int
1804 compare(size_type __pos1, size_type __n1, const _Tp& __t) const;
1805
1806 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 int
1807 compare(size_type __pos1, size_type __n1, const basic_string& __str) const;
1808 _LIBCPP_CONSTEXPR_SINCE_CXX20 int
1809 compare(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2 = npos) const;
1810
1811 template <class _Tp,
1812 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
1813 !__is_same_uncvref<_Tp, basic_string>::value,
1814 int> = 0>
1815 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 int
1816 compare(size_type __pos1, size_type __n1, const _Tp& __t, size_type __pos2, size_type __n2 = npos) const;
1817
1818 _LIBCPP_CONSTEXPR_SINCE_CXX20 int compare(const value_type* __s) const _NOEXCEPT;
1819 _LIBCPP_CONSTEXPR_SINCE_CXX20 int compare(size_type __pos1, size_type __n1, const value_type* __s) const;
1820 _LIBCPP_CONSTEXPR_SINCE_CXX20 int
1821 compare(size_type __pos1, size_type __n1, const value_type* __s, size_type __n2) const;
1822
1823 #if _LIBCPP_STD_VER >= 20
1824 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(__self_view __sv) const noexcept {
1825 return __self_view(data(), size()).starts_with(__sv);
1826 }
1827
1828 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(value_type __c) const noexcept {
1829 return !empty() && _Traits::eq(front(), __c);
1830 }
1831
1832 constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(const value_type* __s) const noexcept {
1833 return starts_with(__self_view(__s));
1834 }
1835
1836 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(__self_view __sv) const noexcept {
1837 return __self_view(data(), size()).ends_with(__sv);
1838 }
1839
1840 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(value_type __c) const noexcept {
1841 return !empty() && _Traits::eq(back(), __c);
1842 }
1843
1844 constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(const value_type* __s) const noexcept {
1845 return ends_with(__self_view(__s));
1846 }
1847 #endif
1848
1849 #if _LIBCPP_STD_VER >= 23
1850 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(__self_view __sv) const noexcept {
1851 return __self_view(data(), size()).contains(__sv);
1852 }
1853
1854 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(value_type __c) const noexcept {
1855 return __self_view(data(), size()).contains(__c);
1856 }
1857
1858 constexpr _LIBCPP_HIDE_FROM_ABI bool contains(const value_type* __s) const {
1859 return __self_view(data(), size()).contains(__s);
1860 }
1861 #endif
1862
1863 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __invariants() const;
1864
1865 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __clear_and_shrink() _NOEXCEPT;
1866
1867 private:
1868 template <class _Alloc>
1869 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool friend
1870 operator==(const basic_string<char, char_traits<char>, _Alloc>& __lhs,
1871 const basic_string<char, char_traits<char>, _Alloc>& __rhs) _NOEXCEPT;
1872
1873 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __shrink_or_extend(size_type __target_capacity);
1874
1875 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS bool
1876 __is_long() const _NOEXCEPT {
1877 if (__libcpp_is_constant_evaluated() && __builtin_constant_p(__r_.first().__l.__is_long_)) {
1878 return __r_.first().__l.__is_long_;
1879 }
1880 return __r_.first().__s.__is_long_;
1881 }
1882
1883 static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __begin_lifetime(pointer __begin, size_type __n) {
1884 #if _LIBCPP_STD_VER >= 20
1885 if (__libcpp_is_constant_evaluated()) {
1886 for (size_type __i = 0; __i != __n; ++__i)
1887 std::construct_at(std::addressof(__begin[__i]));
1888 }
1889 #else
1890 (void)__begin;
1891 (void)__n;
1892 #endif // _LIBCPP_STD_VER >= 20
1893 }
1894
1895 _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI static bool __fits_in_sso(size_type __sz) { return __sz < __min_cap; }
1896
1897 template <class _Iterator, class _Sentinel>
1898 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void
1899 __assign_trivial(_Iterator __first, _Sentinel __last, size_type __n);
1900
1901 template <class _Iterator, class _Sentinel>
1902 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __assign_with_sentinel(_Iterator __first, _Sentinel __last);
1903
1904 // Copy [__first, __last) into [__dest, __dest + (__last - __first)). Assumes that the ranges don't overlap.
1905 template <class _ForwardIter, class _Sent>
1906 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static value_type*
1907 __copy_non_overlapping_range(_ForwardIter __first, _Sent __last, value_type* __dest) {
1908 #ifndef _LIBCPP_CXX03_LANG
1909 if constexpr (__libcpp_is_contiguous_iterator<_ForwardIter>::value &&
1910 is_same<value_type, __iter_value_type<_ForwardIter>>::value && is_same<_ForwardIter, _Sent>::value) {
1911 traits_type::copy(__dest, std::__to_address(__first), __last - __first);
1912 return __dest + (__last - __first);
1913 }
1914 #endif
1915
1916 for (; __first != __last; ++__first)
1917 traits_type::assign(*__dest++, *__first);
1918 return __dest;
1919 }
1920
1921 template <class _ForwardIterator, class _Sentinel>
1922 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 iterator
1923 __insert_from_safe_copy(size_type __n, size_type __ip, _ForwardIterator __first, _Sentinel __last) {
1924 size_type __sz = size();
1925 size_type __cap = capacity();
1926 value_type* __p;
1927 if (__cap - __sz >= __n) {
1928 __annotate_increase(__n);
1929 __p = std::__to_address(__get_pointer());
1930 size_type __n_move = __sz - __ip;
1931 if (__n_move != 0)
1932 traits_type::move(__p + __ip + __n, __p + __ip, __n_move);
1933 } else {
1934 __grow_by_without_replace(__cap, __sz + __n - __cap, __sz, __ip, 0, __n);
1935 __p = std::__to_address(__get_long_pointer());
1936 }
1937 __sz += __n;
1938 __set_size(__sz);
1939 traits_type::assign(__p[__sz], value_type());
1940 __copy_non_overlapping_range(__first, __last, __p + __ip);
1941
1942 return begin() + __ip;
1943 }
1944
1945 template <class _Iterator, class _Sentinel>
1946 _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator
1947 __insert_with_size(const_iterator __pos, _Iterator __first, _Sentinel __last, size_type __n);
1948
1949 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 allocator_type& __alloc() _NOEXCEPT { return __r_.second(); }
1950 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR const allocator_type& __alloc() const _NOEXCEPT { return __r_.second(); }
1951
1952 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS void
1953 __set_short_size(size_type __s) _NOEXCEPT {
1954 _LIBCPP_ASSERT_INTERNAL(__s < __min_cap, "__s should never be greater than or equal to the short string capacity");
1955 __r_.first().__s.__size_ = __s;
1956 __r_.first().__s.__is_long_ = false;
1957 }
1958
1959 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS size_type
1960 __get_short_size() const _NOEXCEPT {
1961 _LIBCPP_ASSERT_INTERNAL(!__r_.first().__s.__is_long_, "String has to be short when trying to get the short size");
1962 return __r_.first().__s.__size_;
1963 }
1964
1965 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __set_long_size(size_type __s) _NOEXCEPT {
1966 __r_.first().__l.__size_ = __s;
1967 }
1968 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type __get_long_size() const _NOEXCEPT {
1969 return __r_.first().__l.__size_;
1970 }
1971 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __set_size(size_type __s) _NOEXCEPT {
1972 if (__is_long())
1973 __set_long_size(__s);
1974 else
1975 __set_short_size(__s);
1976 }
1977
1978 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __set_long_cap(size_type __s) _NOEXCEPT {
1979 __r_.first().__l.__cap_ = __s / __endian_factor;
1980 __r_.first().__l.__is_long_ = true;
1981 }
1982
1983 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type __get_long_cap() const _NOEXCEPT {
1984 return __r_.first().__l.__cap_ * __endian_factor;
1985 }
1986
1987 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __set_long_pointer(pointer __p) _NOEXCEPT {
1988 __r_.first().__l.__data_ = __p;
1989 }
1990 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pointer __get_long_pointer() _NOEXCEPT {
1991 return _LIBCPP_ASAN_VOLATILE_WRAPPER(__r_.first().__l.__data_);
1992 }
1993 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_pointer __get_long_pointer() const _NOEXCEPT {
1994 return _LIBCPP_ASAN_VOLATILE_WRAPPER(__r_.first().__l.__data_);
1995 }
1996 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS pointer
1997 __get_short_pointer() _NOEXCEPT {
1998 return _LIBCPP_ASAN_VOLATILE_WRAPPER(pointer_traits<pointer>::pointer_to(__r_.first().__s.__data_[0]));
1999 }
2000 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS const_pointer
2001 __get_short_pointer() const _NOEXCEPT {
2002 return _LIBCPP_ASAN_VOLATILE_WRAPPER(pointer_traits<const_pointer>::pointer_to(__r_.first().__s.__data_[0]));
2003 }
2004 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pointer __get_pointer() _NOEXCEPT {
2005 return __is_long() ? __get_long_pointer() : __get_short_pointer();
2006 }
2007 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_pointer __get_pointer() const _NOEXCEPT {
2008 return __is_long() ? __get_long_pointer() : __get_short_pointer();
2009 }
2010
2011 // The following functions are no-ops outside of AddressSanitizer mode.
2012 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
2013 __annotate_contiguous_container(const void* __old_mid, const void* __new_mid) const {
2014 (void)__old_mid;
2015 (void)__new_mid;
2016 #if !defined(_LIBCPP_HAS_NO_ASAN) && defined(_LIBCPP_INSTRUMENTED_WITH_ASAN)
2017 # if defined(__APPLE__)
2018 // TODO: remove after addressing issue #96099 (https://github.com/llvm/llvm-project/issues/96099)
2019 if (!__is_long())
2020 return;
2021 # endif
2022 std::__annotate_contiguous_container<_Allocator>(data(), data() + capacity() + 1, __old_mid, __new_mid);
2023 #endif
2024 }
2025
2026 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __annotate_new(size_type __current_size) const _NOEXCEPT {
2027 (void)__current_size;
2028 #if !defined(_LIBCPP_HAS_NO_ASAN) && defined(_LIBCPP_INSTRUMENTED_WITH_ASAN)
2029 if (!__libcpp_is_constant_evaluated())
2030 __annotate_contiguous_container(data() + capacity() + 1, data() + __current_size + 1);
2031 #endif
2032 }
2033
2034 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __annotate_delete() const _NOEXCEPT {
2035 #if !defined(_LIBCPP_HAS_NO_ASAN) && defined(_LIBCPP_INSTRUMENTED_WITH_ASAN)
2036 if (!__libcpp_is_constant_evaluated())
2037 __annotate_contiguous_container(data() + size() + 1, data() + capacity() + 1);
2038 #endif
2039 }
2040
2041 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __annotate_increase(size_type __n) const _NOEXCEPT {
2042 (void)__n;
2043 #if !defined(_LIBCPP_HAS_NO_ASAN) && defined(_LIBCPP_INSTRUMENTED_WITH_ASAN)
2044 if (!__libcpp_is_constant_evaluated())
2045 __annotate_contiguous_container(data() + size() + 1, data() + size() + 1 + __n);
2046 #endif
2047 }
2048
2049 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __annotate_shrink(size_type __old_size) const _NOEXCEPT {
2050 (void)__old_size;
2051 #if !defined(_LIBCPP_HAS_NO_ASAN) && defined(_LIBCPP_INSTRUMENTED_WITH_ASAN)
2052 if (!__libcpp_is_constant_evaluated())
2053 __annotate_contiguous_container(data() + __old_size + 1, data() + size() + 1);
2054 #endif
2055 }
2056
2057 template <size_type __a>
2058 static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type __align_it(size_type __s) _NOEXCEPT {
2059 return (__s + (__a - 1)) & ~(__a - 1);
2060 }
2061 enum { __alignment = 8 };
2062 static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type __recommend(size_type __s) _NOEXCEPT {
2063 if (__s < __min_cap) {
2064 return static_cast<size_type>(__min_cap) - 1;
2065 }
2066 const size_type __boundary = sizeof(value_type) < __alignment ? __alignment / sizeof(value_type) : __endian_factor;
2067 size_type __guess = __align_it<__boundary>(__s + 1) - 1;
2068 if (__guess == __min_cap)
2069 __guess += __endian_factor;
2070 return __guess;
2071 }
2072
2073 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void __init(const value_type* __s, size_type __sz, size_type __reserve);
2074 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void __init(const value_type* __s, size_type __sz);
2075 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void __init(size_type __n, value_type __c);
2076
2077 // Slow path for the (inlined) copy constructor for 'long' strings.
2078 // Always externally instantiated and not inlined.
2079 // Requires that __s is zero terminated.
2080 // The main reason for this function to exist is because for unstable, we
2081 // want to allow inlining of the copy constructor. However, we don't want
2082 // to call the __init() functions as those are marked as inline which may
2083 // result in over-aggressive inlining by the compiler, where our aim is
2084 // to only inline the fast path code directly in the ctor.
2085 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE void __init_copy_ctor_external(const value_type* __s, size_type __sz);
2086
2087 template <class _InputIterator, __enable_if_t<__has_exactly_input_iterator_category<_InputIterator>::value, int> = 0>
2088 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void __init(_InputIterator __first, _InputIterator __last);
2089
2090 template <class _ForwardIterator, __enable_if_t<__has_forward_iterator_category<_ForwardIterator>::value, int> = 0>
2091 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void __init(_ForwardIterator __first, _ForwardIterator __last);
2092
2093 template <class _InputIterator, class _Sentinel>
2094 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
2095 __init_with_sentinel(_InputIterator __first, _Sentinel __last);
2096 template <class _InputIterator, class _Sentinel>
2097 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
2098 __init_with_size(_InputIterator __first, _Sentinel __last, size_type __sz);
2099
2100 _LIBCPP_CONSTEXPR_SINCE_CXX20
2101 #if _LIBCPP_ABI_VERSION >= 2 // We want to use the function in the dylib in ABIv1
2102 _LIBCPP_HIDE_FROM_ABI
2103 #endif
2104 _LIBCPP_DEPRECATED_("use __grow_by_without_replace") void __grow_by(
2105 size_type __old_cap,
2106 size_type __delta_cap,
2107 size_type __old_sz,
2108 size_type __n_copy,
2109 size_type __n_del,
2110 size_type __n_add = 0);
2111 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __grow_by_without_replace(
2112 size_type __old_cap,
2113 size_type __delta_cap,
2114 size_type __old_sz,
2115 size_type __n_copy,
2116 size_type __n_del,
2117 size_type __n_add = 0);
2118 _LIBCPP_CONSTEXPR_SINCE_CXX20 void __grow_by_and_replace(
2119 size_type __old_cap,
2120 size_type __delta_cap,
2121 size_type __old_sz,
2122 size_type __n_copy,
2123 size_type __n_del,
2124 size_type __n_add,
2125 const value_type* __p_new_stuff);
2126
2127 // __assign_no_alias is invoked for assignment operations where we
2128 // have proof that the input does not alias the current instance.
2129 // For example, operator=(basic_string) performs a 'self' check.
2130 template <bool __is_short>
2131 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE basic_string& __assign_no_alias(const value_type* __s, size_type __n);
2132
2133 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __erase_to_end(size_type __pos) {
2134 __null_terminate_at(std::__to_address(__get_pointer()), __pos);
2135 }
2136
2137 // __erase_external_with_move is invoked for erase() invocations where
2138 // `n ~= npos`, likely requiring memory moves on the string data.
2139 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE void __erase_external_with_move(size_type __pos, size_type __n);
2140
2141 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __copy_assign_alloc(const basic_string& __str) {
2142 __copy_assign_alloc(
2143 __str, integral_constant<bool, __alloc_traits::propagate_on_container_copy_assignment::value>());
2144 }
2145
2146 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __copy_assign_alloc(const basic_string& __str, true_type) {
2147 if (__alloc() == __str.__alloc())
2148 __alloc() = __str.__alloc();
2149 else {
2150 if (!__str.__is_long()) {
2151 __clear_and_shrink();
2152 __alloc() = __str.__alloc();
2153 } else {
2154 __annotate_delete();
2155 allocator_type __a = __str.__alloc();
2156 auto __allocation = std::__allocate_at_least(__a, __str.__get_long_cap());
2157 __begin_lifetime(__allocation.ptr, __allocation.count);
2158 if (__is_long())
2159 __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
2160 __alloc() = std::move(__a);
2161 __set_long_pointer(__allocation.ptr);
2162 __set_long_cap(__allocation.count);
2163 __set_long_size(__str.size());
2164 __annotate_new(__get_long_size());
2165 }
2166 }
2167 }
2168
2169 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
2170 __copy_assign_alloc(const basic_string&, false_type) _NOEXCEPT {}
2171
2172 #ifndef _LIBCPP_CXX03_LANG
2173 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
2174 __move_assign(basic_string& __str, false_type) noexcept(__alloc_traits::is_always_equal::value);
2175 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS void
2176 __move_assign(basic_string& __str, true_type)
2177 # if _LIBCPP_STD_VER >= 17
2178 noexcept;
2179 # else
2180 noexcept(is_nothrow_move_assignable<allocator_type>::value);
2181 # endif
2182 #endif
2183
2184 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __move_assign_alloc(basic_string& __str)
2185 _NOEXCEPT_(!__alloc_traits::propagate_on_container_move_assignment::value ||
2186 is_nothrow_move_assignable<allocator_type>::value) {
2187 __move_assign_alloc(
2188 __str, integral_constant<bool, __alloc_traits::propagate_on_container_move_assignment::value>());
2189 }
2190
2191 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __move_assign_alloc(basic_string& __c, true_type)
2192 _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value) {
2193 __alloc() = std::move(__c.__alloc());
2194 }
2195
2196 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __move_assign_alloc(basic_string&, false_type) _NOEXCEPT {}
2197
2198 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE basic_string& __assign_external(const value_type* __s);
2199 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE basic_string& __assign_external(const value_type* __s, size_type __n);
2200
2201 // Assigns the value in __s, guaranteed to be __n < __min_cap in length.
2202 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& __assign_short(const value_type* __s, size_type __n) {
2203 size_type __old_size = size();
2204 if (__n > __old_size)
2205 __annotate_increase(__n - __old_size);
2206 pointer __p =
2207 __is_long() ? (__set_long_size(__n), __get_long_pointer()) : (__set_short_size(__n), __get_short_pointer());
2208 traits_type::move(std::__to_address(__p), __s, __n);
2209 traits_type::assign(__p[__n], value_type());
2210 if (__old_size > __n)
2211 __annotate_shrink(__old_size);
2212 return *this;
2213 }
2214
2215 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string&
2216 __null_terminate_at(value_type* __p, size_type __newsz) {
2217 size_type __old_size = size();
2218 if (__newsz > __old_size)
2219 __annotate_increase(__newsz - __old_size);
2220 __set_size(__newsz);
2221 traits_type::assign(__p[__newsz], value_type());
2222 if (__old_size > __newsz)
2223 __annotate_shrink(__old_size);
2224 return *this;
2225 }
2226
2227 template <class _Tp>
2228 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __addr_in_range(const _Tp& __v) const {
2229 return std::__is_pointer_in_range(data(), data() + size() + 1, std::addressof(__v));
2230 }
2231
2232 _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_length_error() const {
2233 std::__throw_length_error("basic_string");
2234 }
2235
2236 _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const {
2237 std::__throw_out_of_range("basic_string");
2238 }
2239
2240 friend _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string operator+ <>(const basic_string&, const basic_string&);
2241 friend _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string operator+ <>(const value_type*, const basic_string&);
2242 friend _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string operator+ <>(value_type, const basic_string&);
2243 friend _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string operator+ <>(const basic_string&, const value_type*);
2244 friend _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string operator+ <>(const basic_string&, value_type);
2245 #if _LIBCPP_STD_VER >= 26
2246 friend constexpr basic_string operator+ <>(const basic_string&, type_identity_t<__self_view>);
2247 friend constexpr basic_string operator+ <>(type_identity_t<__self_view>, const basic_string&);
2248 #endif
2249 };
2250
2251 // These declarations must appear before any functions are implicitly used
2252 // so that they have the correct visibility specifier.
2253 #define _LIBCPP_DECLARE(...) extern template __VA_ARGS__;
2254 #ifdef _LIBCPP_ABI_STRING_OPTIMIZED_EXTERNAL_INSTANTIATION
2255 _LIBCPP_STRING_UNSTABLE_EXTERN_TEMPLATE_LIST(_LIBCPP_DECLARE, char)
2256 # ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
2257 _LIBCPP_STRING_UNSTABLE_EXTERN_TEMPLATE_LIST(_LIBCPP_DECLARE, wchar_t)
2258 # endif
2259 #else
2260 _LIBCPP_STRING_V1_EXTERN_TEMPLATE_LIST(_LIBCPP_DECLARE, char)
2261 # ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
2262 _LIBCPP_STRING_V1_EXTERN_TEMPLATE_LIST(_LIBCPP_DECLARE, wchar_t)
2263 # endif
2264 #endif
2265 #undef _LIBCPP_DECLARE
2266
2267 #if _LIBCPP_STD_VER >= 17
2268 template <class _InputIterator,
2269 class _CharT = __iter_value_type<_InputIterator>,
2270 class _Allocator = allocator<_CharT>,
2271 class = enable_if_t<__has_input_iterator_category<_InputIterator>::value>,
2272 class = enable_if_t<__is_allocator<_Allocator>::value> >
2273 basic_string(_InputIterator, _InputIterator, _Allocator = _Allocator())
2274 -> basic_string<_CharT, char_traits<_CharT>, _Allocator>;
2275
2276 template <class _CharT,
2277 class _Traits,
2278 class _Allocator = allocator<_CharT>,
2279 class = enable_if_t<__is_allocator<_Allocator>::value> >
2280 explicit basic_string(basic_string_view<_CharT, _Traits>,
2281 const _Allocator& = _Allocator()) -> basic_string<_CharT, _Traits, _Allocator>;
2282
2283 template <class _CharT,
2284 class _Traits,
2285 class _Allocator = allocator<_CharT>,
2286 class = enable_if_t<__is_allocator<_Allocator>::value>,
2287 class _Sz = typename allocator_traits<_Allocator>::size_type >
2288 basic_string(basic_string_view<_CharT, _Traits>, _Sz, _Sz, const _Allocator& = _Allocator())
2289 -> basic_string<_CharT, _Traits, _Allocator>;
2290 #endif
2291
2292 #if _LIBCPP_STD_VER >= 23
2293 template <ranges::input_range _Range,
2294 class _Allocator = allocator<ranges::range_value_t<_Range>>,
2295 class = enable_if_t<__is_allocator<_Allocator>::value> >
2296 basic_string(from_range_t, _Range&&, _Allocator = _Allocator())
2297 -> basic_string<ranges::range_value_t<_Range>, char_traits<ranges::range_value_t<_Range>>, _Allocator>;
2298 #endif
2299
2300 template <class _CharT, class _Traits, class _Allocator>
2301 _LIBCPP_CONSTEXPR_SINCE_CXX20 void
2302 basic_string<_CharT, _Traits, _Allocator>::__init(const value_type* __s, size_type __sz, size_type __reserve) {
2303 if (__libcpp_is_constant_evaluated())
2304 __r_.first() = __rep();
2305 if (__reserve > max_size())
2306 __throw_length_error();
2307 pointer __p;
2308 if (__fits_in_sso(__reserve)) {
2309 __set_short_size(__sz);
2310 __p = __get_short_pointer();
2311 } else {
2312 auto __allocation = std::__allocate_at_least(__alloc(), __recommend(__reserve) + 1);
2313 __p = __allocation.ptr;
2314 __begin_lifetime(__p, __allocation.count);
2315 __set_long_pointer(__p);
2316 __set_long_cap(__allocation.count);
2317 __set_long_size(__sz);
2318 }
2319 traits_type::copy(std::__to_address(__p), __s, __sz);
2320 traits_type::assign(__p[__sz], value_type());
2321 __annotate_new(__sz);
2322 }
2323
2324 template <class _CharT, class _Traits, class _Allocator>
2325 _LIBCPP_CONSTEXPR_SINCE_CXX20 void
2326 basic_string<_CharT, _Traits, _Allocator>::__init(const value_type* __s, size_type __sz) {
2327 if (__libcpp_is_constant_evaluated())
2328 __r_.first() = __rep();
2329 if (__sz > max_size())
2330 __throw_length_error();
2331 pointer __p;
2332 if (__fits_in_sso(__sz)) {
2333 __set_short_size(__sz);
2334 __p = __get_short_pointer();
2335 } else {
2336 auto __allocation = std::__allocate_at_least(__alloc(), __recommend(__sz) + 1);
2337 __p = __allocation.ptr;
2338 __begin_lifetime(__p, __allocation.count);
2339 __set_long_pointer(__p);
2340 __set_long_cap(__allocation.count);
2341 __set_long_size(__sz);
2342 }
2343 traits_type::copy(std::__to_address(__p), __s, __sz);
2344 traits_type::assign(__p[__sz], value_type());
2345 __annotate_new(__sz);
2346 }
2347
2348 template <class _CharT, class _Traits, class _Allocator>
2349 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE void
2350 basic_string<_CharT, _Traits, _Allocator>::__init_copy_ctor_external(const value_type* __s, size_type __sz) {
2351 if (__libcpp_is_constant_evaluated())
2352 __r_.first() = __rep();
2353
2354 pointer __p;
2355 if (__fits_in_sso(__sz)) {
2356 __p = __get_short_pointer();
2357 __set_short_size(__sz);
2358 } else {
2359 if (__sz > max_size())
2360 __throw_length_error();
2361 auto __allocation = std::__allocate_at_least(__alloc(), __recommend(__sz) + 1);
2362 __p = __allocation.ptr;
2363 __begin_lifetime(__p, __allocation.count);
2364 __set_long_pointer(__p);
2365 __set_long_cap(__allocation.count);
2366 __set_long_size(__sz);
2367 }
2368 traits_type::copy(std::__to_address(__p), __s, __sz + 1);
2369 __annotate_new(__sz);
2370 }
2371
2372 template <class _CharT, class _Traits, class _Allocator>
2373 _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::__init(size_type __n, value_type __c) {
2374 if (__libcpp_is_constant_evaluated())
2375 __r_.first() = __rep();
2376
2377 if (__n > max_size())
2378 __throw_length_error();
2379 pointer __p;
2380 if (__fits_in_sso(__n)) {
2381 __set_short_size(__n);
2382 __p = __get_short_pointer();
2383 } else {
2384 auto __allocation = std::__allocate_at_least(__alloc(), __recommend(__n) + 1);
2385 __p = __allocation.ptr;
2386 __begin_lifetime(__p, __allocation.count);
2387 __set_long_pointer(__p);
2388 __set_long_cap(__allocation.count);
2389 __set_long_size(__n);
2390 }
2391 traits_type::assign(std::__to_address(__p), __n, __c);
2392 traits_type::assign(__p[__n], value_type());
2393 __annotate_new(__n);
2394 }
2395
2396 template <class _CharT, class _Traits, class _Allocator>
2397 template <class _InputIterator, __enable_if_t<__has_exactly_input_iterator_category<_InputIterator>::value, int> >
2398 _LIBCPP_CONSTEXPR_SINCE_CXX20 void
2399 basic_string<_CharT, _Traits, _Allocator>::__init(_InputIterator __first, _InputIterator __last) {
2400 __init_with_sentinel(std::move(__first), std::move(__last));
2401 }
2402
2403 template <class _CharT, class _Traits, class _Allocator>
2404 template <class _InputIterator, class _Sentinel>
2405 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
2406 basic_string<_CharT, _Traits, _Allocator>::__init_with_sentinel(_InputIterator __first, _Sentinel __last) {
2407 __r_.first() = __rep();
2408 __annotate_new(0);
2409
2410 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
2411 try {
2412 #endif // _LIBCPP_HAS_NO_EXCEPTIONS
2413 for (; __first != __last; ++__first)
2414 push_back(*__first);
2415 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
2416 } catch (...) {
2417 __annotate_delete();
2418 if (__is_long())
2419 __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
2420 throw;
2421 }
2422 #endif // _LIBCPP_HAS_NO_EXCEPTIONS
2423 }
2424
2425 template <class _CharT, class _Traits, class _Allocator>
2426 template <class _ForwardIterator, __enable_if_t<__has_forward_iterator_category<_ForwardIterator>::value, int> >
2427 _LIBCPP_CONSTEXPR_SINCE_CXX20 void
2428 basic_string<_CharT, _Traits, _Allocator>::__init(_ForwardIterator __first, _ForwardIterator __last) {
2429 size_type __sz = static_cast<size_type>(std::distance(__first, __last));
2430 __init_with_size(__first, __last, __sz);
2431 }
2432
2433 template <class _CharT, class _Traits, class _Allocator>
2434 template <class _InputIterator, class _Sentinel>
2435 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
2436 basic_string<_CharT, _Traits, _Allocator>::__init_with_size(_InputIterator __first, _Sentinel __last, size_type __sz) {
2437 if (__libcpp_is_constant_evaluated())
2438 __r_.first() = __rep();
2439
2440 if (__sz > max_size())
2441 __throw_length_error();
2442
2443 pointer __p;
2444 if (__fits_in_sso(__sz)) {
2445 __set_short_size(__sz);
2446 __p = __get_short_pointer();
2447
2448 } else {
2449 auto __allocation = std::__allocate_at_least(__alloc(), __recommend(__sz) + 1);
2450 __p = __allocation.ptr;
2451 __begin_lifetime(__p, __allocation.count);
2452 __set_long_pointer(__p);
2453 __set_long_cap(__allocation.count);
2454 __set_long_size(__sz);
2455 }
2456
2457 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
2458 try {
2459 #endif // _LIBCPP_HAS_NO_EXCEPTIONS
2460 auto __end = __copy_non_overlapping_range(__first, __last, std::__to_address(__p));
2461 traits_type::assign(*__end, value_type());
2462 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
2463 } catch (...) {
2464 if (__is_long())
2465 __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
2466 throw;
2467 }
2468 #endif // _LIBCPP_HAS_NO_EXCEPTIONS
2469 __annotate_new(__sz);
2470 }
2471
2472 template <class _CharT, class _Traits, class _Allocator>
2473 _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::__grow_by_and_replace(
2474 size_type __old_cap,
2475 size_type __delta_cap,
2476 size_type __old_sz,
2477 size_type __n_copy,
2478 size_type __n_del,
2479 size_type __n_add,
2480 const value_type* __p_new_stuff) {
2481 size_type __ms = max_size();
2482 if (__delta_cap > __ms - __old_cap - 1)
2483 __throw_length_error();
2484 pointer __old_p = __get_pointer();
2485 size_type __cap =
2486 __old_cap < __ms / 2 - __alignment ? __recommend(std::max(__old_cap + __delta_cap, 2 * __old_cap)) : __ms - 1;
2487 __annotate_delete();
2488 auto __allocation = std::__allocate_at_least(__alloc(), __cap + 1);
2489 pointer __p = __allocation.ptr;
2490 __begin_lifetime(__p, __allocation.count);
2491 if (__n_copy != 0)
2492 traits_type::copy(std::__to_address(__p), std::__to_address(__old_p), __n_copy);
2493 if (__n_add != 0)
2494 traits_type::copy(std::__to_address(__p) + __n_copy, __p_new_stuff, __n_add);
2495 size_type __sec_cp_sz = __old_sz - __n_del - __n_copy;
2496 if (__sec_cp_sz != 0)
2497 traits_type::copy(
2498 std::__to_address(__p) + __n_copy + __n_add, std::__to_address(__old_p) + __n_copy + __n_del, __sec_cp_sz);
2499 if (__old_cap + 1 != __min_cap)
2500 __alloc_traits::deallocate(__alloc(), __old_p, __old_cap + 1);
2501 __set_long_pointer(__p);
2502 __set_long_cap(__allocation.count);
2503 __old_sz = __n_copy + __n_add + __sec_cp_sz;
2504 __set_long_size(__old_sz);
2505 traits_type::assign(__p[__old_sz], value_type());
2506 __annotate_new(__old_sz);
2507 }
2508
2509 // __grow_by is deprecated because it does not set the size. It may not update the size when the size is changed, and it
2510 // may also not set the size at all when the string was short initially. This leads to unpredictable size value. It is
2511 // not removed or changed to avoid breaking the ABI.
2512 template <class _CharT, class _Traits, class _Allocator>
2513 void _LIBCPP_CONSTEXPR_SINCE_CXX20
2514 #if _LIBCPP_ABI_VERSION >= 2 // We want to use the function in the dylib in ABIv1
2515 _LIBCPP_HIDE_FROM_ABI
2516 #endif
2517 _LIBCPP_DEPRECATED_("use __grow_by_without_replace") basic_string<_CharT, _Traits, _Allocator>::__grow_by(
2518 size_type __old_cap,
2519 size_type __delta_cap,
2520 size_type __old_sz,
2521 size_type __n_copy,
2522 size_type __n_del,
2523 size_type __n_add) {
2524 size_type __ms = max_size();
2525 if (__delta_cap > __ms - __old_cap)
2526 __throw_length_error();
2527 pointer __old_p = __get_pointer();
2528 size_type __cap =
2529 __old_cap < __ms / 2 - __alignment ? __recommend(std::max(__old_cap + __delta_cap, 2 * __old_cap)) : __ms - 1;
2530 __annotate_delete();
2531 auto __allocation = std::__allocate_at_least(__alloc(), __cap + 1);
2532 pointer __p = __allocation.ptr;
2533 __begin_lifetime(__p, __allocation.count);
2534 if (__n_copy != 0)
2535 traits_type::copy(std::__to_address(__p), std::__to_address(__old_p), __n_copy);
2536 size_type __sec_cp_sz = __old_sz - __n_del - __n_copy;
2537 if (__sec_cp_sz != 0)
2538 traits_type::copy(
2539 std::__to_address(__p) + __n_copy + __n_add, std::__to_address(__old_p) + __n_copy + __n_del, __sec_cp_sz);
2540 if (__old_cap + 1 != __min_cap)
2541 __alloc_traits::deallocate(__alloc(), __old_p, __old_cap + 1);
2542 __set_long_pointer(__p);
2543 __set_long_cap(__allocation.count);
2544 }
2545
2546 template <class _CharT, class _Traits, class _Allocator>
2547 void _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
2548 basic_string<_CharT, _Traits, _Allocator>::__grow_by_without_replace(
2549 size_type __old_cap,
2550 size_type __delta_cap,
2551 size_type __old_sz,
2552 size_type __n_copy,
2553 size_type __n_del,
2554 size_type __n_add) {
2555 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
2556 __grow_by(__old_cap, __delta_cap, __old_sz, __n_copy, __n_del, __n_add);
2557 _LIBCPP_SUPPRESS_DEPRECATED_POP
2558 __set_long_size(__old_sz - __n_del + __n_add);
2559 __annotate_new(__old_sz - __n_del + __n_add);
2560 }
2561
2562 // assign
2563
2564 template <class _CharT, class _Traits, class _Allocator>
2565 template <bool __is_short>
2566 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE basic_string<_CharT, _Traits, _Allocator>&
2567 basic_string<_CharT, _Traits, _Allocator>::__assign_no_alias(const value_type* __s, size_type __n) {
2568 size_type __cap = __is_short ? static_cast<size_type>(__min_cap) : __get_long_cap();
2569 if (__n < __cap) {
2570 size_type __old_size = __is_short ? __get_short_size() : __get_long_size();
2571 if (__n > __old_size)
2572 __annotate_increase(__n - __old_size);
2573 pointer __p = __is_short ? __get_short_pointer() : __get_long_pointer();
2574 __is_short ? __set_short_size(__n) : __set_long_size(__n);
2575 traits_type::copy(std::__to_address(__p), __s, __n);
2576 traits_type::assign(__p[__n], value_type());
2577 if (__old_size > __n)
2578 __annotate_shrink(__old_size);
2579 } else {
2580 size_type __sz = __is_short ? __get_short_size() : __get_long_size();
2581 __grow_by_and_replace(__cap - 1, __n - __cap + 1, __sz, 0, __sz, __n, __s);
2582 }
2583 return *this;
2584 }
2585
2586 template <class _CharT, class _Traits, class _Allocator>
2587 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE basic_string<_CharT, _Traits, _Allocator>&
2588 basic_string<_CharT, _Traits, _Allocator>::__assign_external(const value_type* __s, size_type __n) {
2589 size_type __cap = capacity();
2590 if (__cap >= __n) {
2591 size_type __old_size = size();
2592 if (__n > __old_size)
2593 __annotate_increase(__n - __old_size);
2594 value_type* __p = std::__to_address(__get_pointer());
2595 traits_type::move(__p, __s, __n);
2596 return __null_terminate_at(__p, __n);
2597 } else {
2598 size_type __sz = size();
2599 __grow_by_and_replace(__cap, __n - __cap, __sz, 0, __sz, __n, __s);
2600 return *this;
2601 }
2602 }
2603
2604 template <class _CharT, class _Traits, class _Allocator>
2605 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2606 basic_string<_CharT, _Traits, _Allocator>::assign(const value_type* __s, size_type __n) {
2607 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::assign received nullptr");
2608 return (__builtin_constant_p(__n) && __fits_in_sso(__n)) ? __assign_short(__s, __n) : __assign_external(__s, __n);
2609 }
2610
2611 template <class _CharT, class _Traits, class _Allocator>
2612 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2613 basic_string<_CharT, _Traits, _Allocator>::assign(size_type __n, value_type __c) {
2614 size_type __cap = capacity();
2615 size_type __old_size = size();
2616 if (__cap < __n) {
2617 size_type __sz = size();
2618 __grow_by_without_replace(__cap, __n - __cap, __sz, 0, __sz);
2619 __annotate_increase(__n);
2620 } else if (__n > __old_size)
2621 __annotate_increase(__n - __old_size);
2622 value_type* __p = std::__to_address(__get_pointer());
2623 traits_type::assign(__p, __n, __c);
2624 return __null_terminate_at(__p, __n);
2625 }
2626
2627 template <class _CharT, class _Traits, class _Allocator>
2628 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2629 basic_string<_CharT, _Traits, _Allocator>::operator=(value_type __c) {
2630 pointer __p;
2631 size_type __old_size = size();
2632 if (__old_size == 0)
2633 __annotate_increase(1);
2634 if (__is_long()) {
2635 __p = __get_long_pointer();
2636 __set_long_size(1);
2637 } else {
2638 __p = __get_short_pointer();
2639 __set_short_size(1);
2640 }
2641 traits_type::assign(*__p, __c);
2642 traits_type::assign(*++__p, value_type());
2643 if (__old_size > 1)
2644 __annotate_shrink(__old_size);
2645 return *this;
2646 }
2647
2648 template <class _CharT, class _Traits, class _Allocator>
2649 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS basic_string<_CharT, _Traits, _Allocator>&
2650 basic_string<_CharT, _Traits, _Allocator>::operator=(const basic_string& __str) {
2651 if (this != std::addressof(__str)) {
2652 __copy_assign_alloc(__str);
2653 if (!__is_long()) {
2654 if (!__str.__is_long()) {
2655 size_type __old_size = __get_short_size();
2656 if (__get_short_size() < __str.__get_short_size())
2657 __annotate_increase(__str.__get_short_size() - __get_short_size());
2658 __r_.first() = __str.__r_.first();
2659 if (__old_size > __get_short_size())
2660 __annotate_shrink(__old_size);
2661 } else {
2662 return __assign_no_alias<true>(__str.data(), __str.size());
2663 }
2664 } else {
2665 return __assign_no_alias<false>(__str.data(), __str.size());
2666 }
2667 }
2668 return *this;
2669 }
2670
2671 #ifndef _LIBCPP_CXX03_LANG
2672
2673 template <class _CharT, class _Traits, class _Allocator>
2674 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::__move_assign(
2675 basic_string& __str, false_type) noexcept(__alloc_traits::is_always_equal::value) {
2676 if (__alloc() != __str.__alloc())
2677 assign(__str);
2678 else
2679 __move_assign(__str, true_type());
2680 }
2681
2682 template <class _CharT, class _Traits, class _Allocator>
2683 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS void
2684 basic_string<_CharT, _Traits, _Allocator>::__move_assign(basic_string& __str, true_type)
2685 # if _LIBCPP_STD_VER >= 17
2686 noexcept
2687 # else
2688 noexcept(is_nothrow_move_assignable<allocator_type>::value)
2689 # endif
2690 {
2691 __annotate_delete();
2692 if (__is_long()) {
2693 __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
2694 # if _LIBCPP_STD_VER <= 14
2695 if (!is_nothrow_move_assignable<allocator_type>::value) {
2696 __set_short_size(0);
2697 traits_type::assign(__get_short_pointer()[0], value_type());
2698 __annotate_new(0);
2699 }
2700 # endif
2701 }
2702 size_type __str_old_size = __str.size();
2703 bool __str_was_short = !__str.__is_long();
2704
2705 __move_assign_alloc(__str);
2706 __r_.first() = __str.__r_.first();
2707 __str.__set_short_size(0);
2708 traits_type::assign(__str.__get_short_pointer()[0], value_type());
2709
2710 if (__str_was_short && this != &__str)
2711 __str.__annotate_shrink(__str_old_size);
2712 else
2713 // ASan annotations: was long, so object memory is unpoisoned as new.
2714 // Or is same as *this, and __annotate_delete() was called.
2715 __str.__annotate_new(0);
2716
2717 // ASan annotations: Guard against `std::string s; s = std::move(s);`
2718 // You can find more here: https://en.cppreference.com/w/cpp/utility/move
2719 // Quote: "Unless otherwise specified, all standard library objects that have been moved
2720 // from are placed in a "valid but unspecified state", meaning the object's class
2721 // invariants hold (so functions without preconditions, such as the assignment operator,
2722 // can be safely used on the object after it was moved from):"
2723 // Quote: "v = std::move(v); // the value of v is unspecified"
2724 if (!__is_long() && &__str != this)
2725 // If it is long string, delete was never called on original __str's buffer.
2726 __annotate_new(__get_short_size());
2727 }
2728
2729 #endif
2730
2731 template <class _CharT, class _Traits, class _Allocator>
2732 template <class _InputIterator, __enable_if_t<__has_exactly_input_iterator_category<_InputIterator>::value, int> >
2733 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2734 basic_string<_CharT, _Traits, _Allocator>::assign(_InputIterator __first, _InputIterator __last) {
2735 __assign_with_sentinel(__first, __last);
2736 return *this;
2737 }
2738
2739 template <class _CharT, class _Traits, class _Allocator>
2740 template <class _InputIterator, class _Sentinel>
2741 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
2742 basic_string<_CharT, _Traits, _Allocator>::__assign_with_sentinel(_InputIterator __first, _Sentinel __last) {
2743 const basic_string __temp(__init_with_sentinel_tag(), std::move(__first), std::move(__last), __alloc());
2744 assign(__temp.data(), __temp.size());
2745 }
2746
2747 template <class _CharT, class _Traits, class _Allocator>
2748 template <class _ForwardIterator, __enable_if_t<__has_forward_iterator_category<_ForwardIterator>::value, int> >
2749 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2750 basic_string<_CharT, _Traits, _Allocator>::assign(_ForwardIterator __first, _ForwardIterator __last) {
2751 if (__string_is_trivial_iterator<_ForwardIterator>::value) {
2752 size_type __n = static_cast<size_type>(std::distance(__first, __last));
2753 __assign_trivial(__first, __last, __n);
2754 } else {
2755 __assign_with_sentinel(__first, __last);
2756 }
2757
2758 return *this;
2759 }
2760
2761 template <class _CharT, class _Traits, class _Allocator>
2762 template <class _Iterator, class _Sentinel>
2763 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void
2764 basic_string<_CharT, _Traits, _Allocator>::__assign_trivial(_Iterator __first, _Sentinel __last, size_type __n) {
2765 _LIBCPP_ASSERT_INTERNAL(
2766 __string_is_trivial_iterator<_Iterator>::value, "The iterator type given to `__assign_trivial` must be trivial");
2767
2768 size_type __old_size = size();
2769 size_type __cap = capacity();
2770 if (__cap < __n) {
2771 // Unlike `append` functions, if the input range points into the string itself, there is no case that the input
2772 // range could get invalidated by reallocation:
2773 // 1. If the input range is a subset of the string itself, its size cannot exceed the capacity of the string,
2774 // thus no reallocation would happen.
2775 // 2. In the exotic case where the input range is the byte representation of the string itself, the string
2776 // object itself stays valid even if reallocation happens.
2777 size_type __sz = size();
2778 __grow_by_without_replace(__cap, __n - __cap, __sz, 0, __sz);
2779 __annotate_increase(__n);
2780 } else if (__n > __old_size)
2781 __annotate_increase(__n - __old_size);
2782 pointer __p = __get_pointer();
2783 for (; __first != __last; ++__p, (void)++__first)
2784 traits_type::assign(*__p, *__first);
2785 traits_type::assign(*__p, value_type());
2786 __set_size(__n);
2787 if (__n < __old_size)
2788 __annotate_shrink(__old_size);
2789 }
2790
2791 template <class _CharT, class _Traits, class _Allocator>
2792 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2793 basic_string<_CharT, _Traits, _Allocator>::assign(const basic_string& __str, size_type __pos, size_type __n) {
2794 size_type __sz = __str.size();
2795 if (__pos > __sz)
2796 __throw_out_of_range();
2797 return assign(__str.data() + __pos, std::min(__n, __sz - __pos));
2798 }
2799
2800 template <class _CharT, class _Traits, class _Allocator>
2801 template <class _Tp,
2802 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
2803 !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
2804 int> >
2805 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2806 basic_string<_CharT, _Traits, _Allocator>::assign(const _Tp& __t, size_type __pos, size_type __n) {
2807 __self_view __sv = __t;
2808 size_type __sz = __sv.size();
2809 if (__pos > __sz)
2810 __throw_out_of_range();
2811 return assign(__sv.data() + __pos, std::min(__n, __sz - __pos));
2812 }
2813
2814 template <class _CharT, class _Traits, class _Allocator>
2815 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE basic_string<_CharT, _Traits, _Allocator>&
2816 basic_string<_CharT, _Traits, _Allocator>::__assign_external(const value_type* __s) {
2817 return __assign_external(__s, traits_type::length(__s));
2818 }
2819
2820 template <class _CharT, class _Traits, class _Allocator>
2821 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2822 basic_string<_CharT, _Traits, _Allocator>::assign(const value_type* __s) {
2823 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::assign received nullptr");
2824 return __builtin_constant_p(*__s)
2825 ? (__fits_in_sso(traits_type::length(__s)) ? __assign_short(__s, traits_type::length(__s))
2826 : __assign_external(__s, traits_type::length(__s)))
2827 : __assign_external(__s);
2828 }
2829 // append
2830
2831 template <class _CharT, class _Traits, class _Allocator>
2832 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2833 basic_string<_CharT, _Traits, _Allocator>::append(const value_type* __s, size_type __n) {
2834 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::append received nullptr");
2835 size_type __cap = capacity();
2836 size_type __sz = size();
2837 if (__cap - __sz >= __n) {
2838 if (__n) {
2839 __annotate_increase(__n);
2840 value_type* __p = std::__to_address(__get_pointer());
2841 traits_type::copy(__p + __sz, __s, __n);
2842 __sz += __n;
2843 __set_size(__sz);
2844 traits_type::assign(__p[__sz], value_type());
2845 }
2846 } else
2847 __grow_by_and_replace(__cap, __sz + __n - __cap, __sz, __sz, 0, __n, __s);
2848 return *this;
2849 }
2850
2851 template <class _CharT, class _Traits, class _Allocator>
2852 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2853 basic_string<_CharT, _Traits, _Allocator>::append(size_type __n, value_type __c) {
2854 if (__n) {
2855 size_type __cap = capacity();
2856 size_type __sz = size();
2857 if (__cap - __sz < __n)
2858 __grow_by_without_replace(__cap, __sz + __n - __cap, __sz, __sz, 0);
2859 __annotate_increase(__n);
2860 pointer __p = __get_pointer();
2861 traits_type::assign(std::__to_address(__p) + __sz, __n, __c);
2862 __sz += __n;
2863 __set_size(__sz);
2864 traits_type::assign(__p[__sz], value_type());
2865 }
2866 return *this;
2867 }
2868
2869 template <class _CharT, class _Traits, class _Allocator>
2870 _LIBCPP_CONSTEXPR_SINCE_CXX20 inline void
2871 basic_string<_CharT, _Traits, _Allocator>::__append_default_init(size_type __n) {
2872 if (__n) {
2873 size_type __cap = capacity();
2874 size_type __sz = size();
2875 if (__cap - __sz < __n)
2876 __grow_by_without_replace(__cap, __sz + __n - __cap, __sz, __sz, 0);
2877 __annotate_increase(__n);
2878 pointer __p = __get_pointer();
2879 __sz += __n;
2880 __set_size(__sz);
2881 traits_type::assign(__p[__sz], value_type());
2882 }
2883 }
2884
2885 template <class _CharT, class _Traits, class _Allocator>
2886 _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::push_back(value_type __c) {
2887 bool __is_short = !__is_long();
2888 size_type __cap;
2889 size_type __sz;
2890 if (__is_short) {
2891 __cap = __min_cap - 1;
2892 __sz = __get_short_size();
2893 } else {
2894 __cap = __get_long_cap() - 1;
2895 __sz = __get_long_size();
2896 }
2897 if (__sz == __cap) {
2898 __grow_by_without_replace(__cap, 1, __sz, __sz, 0);
2899 __annotate_increase(1);
2900 __is_short = false; // the string is always long after __grow_by
2901 } else
2902 __annotate_increase(1);
2903 pointer __p = __get_pointer();
2904 if (__is_short) {
2905 __p = __get_short_pointer() + __sz;
2906 __set_short_size(__sz + 1);
2907 } else {
2908 __p = __get_long_pointer() + __sz;
2909 __set_long_size(__sz + 1);
2910 }
2911 traits_type::assign(*__p, __c);
2912 traits_type::assign(*++__p, value_type());
2913 }
2914
2915 template <class _CharT, class _Traits, class _Allocator>
2916 template <class _ForwardIterator, __enable_if_t<__has_forward_iterator_category<_ForwardIterator>::value, int> >
2917 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2918 basic_string<_CharT, _Traits, _Allocator>::append(_ForwardIterator __first, _ForwardIterator __last) {
2919 size_type __sz = size();
2920 size_type __cap = capacity();
2921 size_type __n = static_cast<size_type>(std::distance(__first, __last));
2922 if (__n) {
2923 if (__string_is_trivial_iterator<_ForwardIterator>::value && !__addr_in_range(*__first)) {
2924 if (__cap - __sz < __n)
2925 __grow_by_without_replace(__cap, __sz + __n - __cap, __sz, __sz, 0);
2926 __annotate_increase(__n);
2927 auto __end = __copy_non_overlapping_range(__first, __last, std::__to_address(__get_pointer() + __sz));
2928 traits_type::assign(*__end, value_type());
2929 __set_size(__sz + __n);
2930 } else {
2931 const basic_string __temp(__first, __last, __alloc());
2932 append(__temp.data(), __temp.size());
2933 }
2934 }
2935 return *this;
2936 }
2937
2938 template <class _CharT, class _Traits, class _Allocator>
2939 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2940 basic_string<_CharT, _Traits, _Allocator>::append(const basic_string& __str, size_type __pos, size_type __n) {
2941 size_type __sz = __str.size();
2942 if (__pos > __sz)
2943 __throw_out_of_range();
2944 return append(__str.data() + __pos, std::min(__n, __sz - __pos));
2945 }
2946
2947 template <class _CharT, class _Traits, class _Allocator>
2948 template <class _Tp,
2949 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
2950 !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
2951 int> >
2952 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2953 basic_string<_CharT, _Traits, _Allocator>::append(const _Tp& __t, size_type __pos, size_type __n) {
2954 __self_view __sv = __t;
2955 size_type __sz = __sv.size();
2956 if (__pos > __sz)
2957 __throw_out_of_range();
2958 return append(__sv.data() + __pos, std::min(__n, __sz - __pos));
2959 }
2960
2961 template <class _CharT, class _Traits, class _Allocator>
2962 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2963 basic_string<_CharT, _Traits, _Allocator>::append(const value_type* __s) {
2964 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::append received nullptr");
2965 return append(__s, traits_type::length(__s));
2966 }
2967
2968 // insert
2969
2970 template <class _CharT, class _Traits, class _Allocator>
2971 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
2972 basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, const value_type* __s, size_type __n) {
2973 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::insert received nullptr");
2974 size_type __sz = size();
2975 if (__pos > __sz)
2976 __throw_out_of_range();
2977 size_type __cap = capacity();
2978 if (__cap - __sz >= __n) {
2979 if (__n) {
2980 __annotate_increase(__n);
2981 value_type* __p = std::__to_address(__get_pointer());
2982 size_type __n_move = __sz - __pos;
2983 if (__n_move != 0) {
2984 if (std::__is_pointer_in_range(__p + __pos, __p + __sz, __s))
2985 __s += __n;
2986 traits_type::move(__p + __pos + __n, __p + __pos, __n_move);
2987 }
2988 traits_type::move(__p + __pos, __s, __n);
2989 __sz += __n;
2990 __set_size(__sz);
2991 traits_type::assign(__p[__sz], value_type());
2992 }
2993 } else
2994 __grow_by_and_replace(__cap, __sz + __n - __cap, __sz, __pos, 0, __n, __s);
2995 return *this;
2996 }
2997
2998 template <class _CharT, class _Traits, class _Allocator>
2999 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
3000 basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, size_type __n, value_type __c) {
3001 size_type __sz = size();
3002 if (__pos > __sz)
3003 __throw_out_of_range();
3004 if (__n) {
3005 size_type __cap = capacity();
3006 value_type* __p;
3007 if (__cap - __sz >= __n) {
3008 __annotate_increase(__n);
3009 __p = std::__to_address(__get_pointer());
3010 size_type __n_move = __sz - __pos;
3011 if (__n_move != 0)
3012 traits_type::move(__p + __pos + __n, __p + __pos, __n_move);
3013 } else {
3014 __grow_by_without_replace(__cap, __sz + __n - __cap, __sz, __pos, 0, __n);
3015 __p = std::__to_address(__get_long_pointer());
3016 }
3017 traits_type::assign(__p + __pos, __n, __c);
3018 __sz += __n;
3019 __set_size(__sz);
3020 traits_type::assign(__p[__sz], value_type());
3021 }
3022 return *this;
3023 }
3024
3025 template <class _CharT, class _Traits, class _Allocator>
3026 template <class _InputIterator, __enable_if_t<__has_exactly_input_iterator_category<_InputIterator>::value, int> >
3027 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::iterator
3028 basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, _InputIterator __first, _InputIterator __last) {
3029 const basic_string __temp(__first, __last, __alloc());
3030 return insert(__pos, __temp.data(), __temp.data() + __temp.size());
3031 }
3032
3033 template <class _CharT, class _Traits, class _Allocator>
3034 template <class _ForwardIterator, __enable_if_t<__has_forward_iterator_category<_ForwardIterator>::value, int> >
3035 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::iterator
3036 basic_string<_CharT, _Traits, _Allocator>::insert(
3037 const_iterator __pos, _ForwardIterator __first, _ForwardIterator __last) {
3038 auto __n = static_cast<size_type>(std::distance(__first, __last));
3039 return __insert_with_size(__pos, __first, __last, __n);
3040 }
3041
3042 template <class _CharT, class _Traits, class _Allocator>
3043 template <class _Iterator, class _Sentinel>
3044 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::iterator
3045 basic_string<_CharT, _Traits, _Allocator>::__insert_with_size(
3046 const_iterator __pos, _Iterator __first, _Sentinel __last, size_type __n) {
3047 size_type __ip = static_cast<size_type>(__pos - begin());
3048 if (__n == 0)
3049 return begin() + __ip;
3050
3051 if (__string_is_trivial_iterator<_Iterator>::value && !__addr_in_range(*__first)) {
3052 return __insert_from_safe_copy(__n, __ip, __first, __last);
3053 } else {
3054 const basic_string __temp(__init_with_sentinel_tag(), __first, __last, __alloc());
3055 return __insert_from_safe_copy(__n, __ip, __temp.begin(), __temp.end());
3056 }
3057 }
3058
3059 template <class _CharT, class _Traits, class _Allocator>
3060 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
3061 basic_string<_CharT, _Traits, _Allocator>::insert(
3062 size_type __pos1, const basic_string& __str, size_type __pos2, size_type __n) {
3063 size_type __str_sz = __str.size();
3064 if (__pos2 > __str_sz)
3065 __throw_out_of_range();
3066 return insert(__pos1, __str.data() + __pos2, std::min(__n, __str_sz - __pos2));
3067 }
3068
3069 template <class _CharT, class _Traits, class _Allocator>
3070 template <class _Tp,
3071 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
3072 !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
3073 int> >
3074 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
3075 basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos1, const _Tp& __t, size_type __pos2, size_type __n) {
3076 __self_view __sv = __t;
3077 size_type __str_sz = __sv.size();
3078 if (__pos2 > __str_sz)
3079 __throw_out_of_range();
3080 return insert(__pos1, __sv.data() + __pos2, std::min(__n, __str_sz - __pos2));
3081 }
3082
3083 template <class _CharT, class _Traits, class _Allocator>
3084 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
3085 basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, const value_type* __s) {
3086 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::insert received nullptr");
3087 return insert(__pos, __s, traits_type::length(__s));
3088 }
3089
3090 template <class _CharT, class _Traits, class _Allocator>
3091 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::iterator
3092 basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, value_type __c) {
3093 size_type __ip = static_cast<size_type>(__pos - begin());
3094 size_type __sz = size();
3095 size_type __cap = capacity();
3096 value_type* __p;
3097 if (__cap == __sz) {
3098 __grow_by_without_replace(__cap, 1, __sz, __ip, 0, 1);
3099 __p = std::__to_address(__get_long_pointer());
3100 } else {
3101 __annotate_increase(1);
3102 __p = std::__to_address(__get_pointer());
3103 size_type __n_move = __sz - __ip;
3104 if (__n_move != 0)
3105 traits_type::move(__p + __ip + 1, __p + __ip, __n_move);
3106 }
3107 traits_type::assign(__p[__ip], __c);
3108 traits_type::assign(__p[++__sz], value_type());
3109 __set_size(__sz);
3110 return begin() + static_cast<difference_type>(__ip);
3111 }
3112
3113 // replace
3114
3115 template <class _CharT, class _Traits, class _Allocator>
3116 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
3117 basic_string<_CharT, _Traits, _Allocator>::replace(
3118 size_type __pos, size_type __n1, const value_type* __s, size_type __n2)
3119 _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK {
3120 _LIBCPP_ASSERT_NON_NULL(__n2 == 0 || __s != nullptr, "string::replace received nullptr");
3121 size_type __sz = size();
3122 if (__pos > __sz)
3123 __throw_out_of_range();
3124 __n1 = std::min(__n1, __sz - __pos);
3125 size_type __cap = capacity();
3126 if (__cap - __sz + __n1 >= __n2) {
3127 value_type* __p = std::__to_address(__get_pointer());
3128 if (__n1 != __n2) {
3129 if (__n2 > __n1)
3130 __annotate_increase(__n2 - __n1);
3131 size_type __n_move = __sz - __pos - __n1;
3132 if (__n_move != 0) {
3133 if (__n1 > __n2) {
3134 traits_type::move(__p + __pos, __s, __n2);
3135 traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move);
3136 return __null_terminate_at(__p, __sz + (__n2 - __n1));
3137 }
3138 if (std::__is_pointer_in_range(__p + __pos + 1, __p + __sz, __s)) {
3139 if (__p + __pos + __n1 <= __s)
3140 __s += __n2 - __n1;
3141 else // __p + __pos < __s < __p + __pos + __n1
3142 {
3143 traits_type::move(__p + __pos, __s, __n1);
3144 __pos += __n1;
3145 __s += __n2;
3146 __n2 -= __n1;
3147 __n1 = 0;
3148 }
3149 }
3150 traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move);
3151 }
3152 }
3153 traits_type::move(__p + __pos, __s, __n2);
3154 return __null_terminate_at(__p, __sz + (__n2 - __n1));
3155 } else
3156 __grow_by_and_replace(__cap, __sz - __n1 + __n2 - __cap, __sz, __pos, __n1, __n2, __s);
3157 return *this;
3158 }
3159
3160 template <class _CharT, class _Traits, class _Allocator>
3161 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
3162 basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, size_type __n2, value_type __c) {
3163 size_type __sz = size();
3164 if (__pos > __sz)
3165 __throw_out_of_range();
3166 __n1 = std::min(__n1, __sz - __pos);
3167 size_type __cap = capacity();
3168 value_type* __p;
3169 if (__cap - __sz + __n1 >= __n2) {
3170 __p = std::__to_address(__get_pointer());
3171 if (__n1 != __n2) {
3172 if (__n2 > __n1)
3173 __annotate_increase(__n2 - __n1);
3174 size_type __n_move = __sz - __pos - __n1;
3175 if (__n_move != 0)
3176 traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move);
3177 }
3178 } else {
3179 __grow_by_without_replace(__cap, __sz - __n1 + __n2 - __cap, __sz, __pos, __n1, __n2);
3180 __p = std::__to_address(__get_long_pointer());
3181 }
3182 traits_type::assign(__p + __pos, __n2, __c);
3183 return __null_terminate_at(__p, __sz - (__n1 - __n2));
3184 }
3185
3186 template <class _CharT, class _Traits, class _Allocator>
3187 template <class _InputIterator, __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> >
3188 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
3189 basic_string<_CharT, _Traits, _Allocator>::replace(
3190 const_iterator __i1, const_iterator __i2, _InputIterator __j1, _InputIterator __j2) {
3191 const basic_string __temp(__j1, __j2, __alloc());
3192 return replace(__i1, __i2, __temp);
3193 }
3194
3195 template <class _CharT, class _Traits, class _Allocator>
3196 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
3197 basic_string<_CharT, _Traits, _Allocator>::replace(
3198 size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2) {
3199 size_type __str_sz = __str.size();
3200 if (__pos2 > __str_sz)
3201 __throw_out_of_range();
3202 return replace(__pos1, __n1, __str.data() + __pos2, std::min(__n2, __str_sz - __pos2));
3203 }
3204
3205 template <class _CharT, class _Traits, class _Allocator>
3206 template <class _Tp,
3207 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
3208 !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
3209 int> >
3210 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
3211 basic_string<_CharT, _Traits, _Allocator>::replace(
3212 size_type __pos1, size_type __n1, const _Tp& __t, size_type __pos2, size_type __n2) {
3213 __self_view __sv = __t;
3214 size_type __str_sz = __sv.size();
3215 if (__pos2 > __str_sz)
3216 __throw_out_of_range();
3217 return replace(__pos1, __n1, __sv.data() + __pos2, std::min(__n2, __str_sz - __pos2));
3218 }
3219
3220 template <class _CharT, class _Traits, class _Allocator>
3221 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
3222 basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, const value_type* __s) {
3223 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::replace received nullptr");
3224 return replace(__pos, __n1, __s, traits_type::length(__s));
3225 }
3226
3227 // erase
3228
3229 // 'externally instantiated' erase() implementation, called when __n != npos.
3230 // Does not check __pos against size()
3231 template <class _CharT, class _Traits, class _Allocator>
3232 _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE void
3233 basic_string<_CharT, _Traits, _Allocator>::__erase_external_with_move(size_type __pos, size_type __n) {
3234 if (__n) {
3235 size_type __sz = size();
3236 value_type* __p = std::__to_address(__get_pointer());
3237 __n = std::min(__n, __sz - __pos);
3238 size_type __n_move = __sz - __pos - __n;
3239 if (__n_move != 0)
3240 traits_type::move(__p + __pos, __p + __pos + __n, __n_move);
3241 __null_terminate_at(__p, __sz - __n);
3242 }
3243 }
3244
3245 template <class _CharT, class _Traits, class _Allocator>
3246 _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>&
3247 basic_string<_CharT, _Traits, _Allocator>::erase(size_type __pos, size_type __n) {
3248 if (__pos > size())
3249 __throw_out_of_range();
3250 if (__n == npos) {
3251 __erase_to_end(__pos);
3252 } else {
3253 __erase_external_with_move(__pos, __n);
3254 }
3255 return *this;
3256 }
3257
3258 template <class _CharT, class _Traits, class _Allocator>
3259 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::iterator
3260 basic_string<_CharT, _Traits, _Allocator>::erase(const_iterator __pos) {
3261 _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(
3262 __pos != end(), "string::erase(iterator) called with a non-dereferenceable iterator");
3263 iterator __b = begin();
3264 size_type __r = static_cast<size_type>(__pos - __b);
3265 erase(__r, 1);
3266 return __b + static_cast<difference_type>(__r);
3267 }
3268
3269 template <class _CharT, class _Traits, class _Allocator>
3270 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::iterator
3271 basic_string<_CharT, _Traits, _Allocator>::erase(const_iterator __first, const_iterator __last) {
3272 _LIBCPP_ASSERT_VALID_INPUT_RANGE(__first <= __last, "string::erase(first, last) called with invalid range");
3273 iterator __b = begin();
3274 size_type __r = static_cast<size_type>(__first - __b);
3275 erase(__r, static_cast<size_type>(__last - __first));
3276 return __b + static_cast<difference_type>(__r);
3277 }
3278
3279 template <class _CharT, class _Traits, class _Allocator>
3280 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::pop_back() {
3281 _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string::pop_back(): string is already empty");
3282 __erase_to_end(size() - 1);
3283 }
3284
3285 template <class _CharT, class _Traits, class _Allocator>
3286 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::clear() _NOEXCEPT {
3287 size_type __old_size = size();
3288 if (__is_long()) {
3289 traits_type::assign(*__get_long_pointer(), value_type());
3290 __set_long_size(0);
3291 } else {
3292 traits_type::assign(*__get_short_pointer(), value_type());
3293 __set_short_size(0);
3294 }
3295 __annotate_shrink(__old_size);
3296 }
3297
3298 template <class _CharT, class _Traits, class _Allocator>
3299 _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::resize(size_type __n, value_type __c) {
3300 size_type __sz = size();
3301 if (__n > __sz)
3302 append(__n - __sz, __c);
3303 else
3304 __erase_to_end(__n);
3305 }
3306
3307 template <class _CharT, class _Traits, class _Allocator>
3308 _LIBCPP_CONSTEXPR_SINCE_CXX20 inline void
3309 basic_string<_CharT, _Traits, _Allocator>::__resize_default_init(size_type __n) {
3310 size_type __sz = size();
3311 if (__n > __sz) {
3312 __append_default_init(__n - __sz);
3313 } else
3314 __erase_to_end(__n);
3315 }
3316
3317 template <class _CharT, class _Traits, class _Allocator>
3318 _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::reserve(size_type __requested_capacity) {
3319 if (__requested_capacity > max_size())
3320 __throw_length_error();
3321
3322 // Make sure reserve(n) never shrinks. This is technically only required in C++20
3323 // and later (since P0966R1), however we provide consistent behavior in all Standard
3324 // modes because this function is instantiated in the shared library.
3325 if (__requested_capacity <= capacity())
3326 return;
3327
3328 size_type __target_capacity = std::max(__requested_capacity, size());
3329 __target_capacity = __recommend(__target_capacity);
3330 if (__target_capacity == capacity())
3331 return;
3332
3333 __shrink_or_extend(__target_capacity);
3334 }
3335
3336 template <class _CharT, class _Traits, class _Allocator>
3337 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::shrink_to_fit() _NOEXCEPT {
3338 size_type __target_capacity = __recommend(size());
3339 if (__target_capacity == capacity())
3340 return;
3341
3342 __shrink_or_extend(__target_capacity);
3343 }
3344
3345 template <class _CharT, class _Traits, class _Allocator>
3346 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void
3347 basic_string<_CharT, _Traits, _Allocator>::__shrink_or_extend(size_type __target_capacity) {
3348 __annotate_delete();
3349 size_type __cap = capacity();
3350 size_type __sz = size();
3351
3352 pointer __new_data, __p;
3353 bool __was_long, __now_long;
3354 if (__fits_in_sso(__target_capacity)) {
3355 __was_long = true;
3356 __now_long = false;
3357 __new_data = __get_short_pointer();
3358 __p = __get_long_pointer();
3359 } else {
3360 if (__target_capacity > __cap) {
3361 // Extend
3362 // - called from reserve should propagate the exception thrown.
3363 auto __allocation = std::__allocate_at_least(__alloc(), __target_capacity + 1);
3364 __new_data = __allocation.ptr;
3365 __target_capacity = __allocation.count - 1;
3366 } else {
3367 // Shrink
3368 // - called from shrink_to_fit should not throw.
3369 // - called from reserve may throw but is not required to.
3370 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
3371 try {
3372 #endif // _LIBCPP_HAS_NO_EXCEPTIONS
3373 auto __allocation = std::__allocate_at_least(__alloc(), __target_capacity + 1);
3374
3375 // The Standard mandates shrink_to_fit() does not increase the capacity.
3376 // With equal capacity keep the existing buffer. This avoids extra work
3377 // due to swapping the elements.
3378 if (__allocation.count - 1 > __target_capacity) {
3379 __alloc_traits::deallocate(__alloc(), __allocation.ptr, __allocation.count);
3380 __annotate_new(__sz); // Undoes the __annotate_delete()
3381 return;
3382 }
3383 __new_data = __allocation.ptr;
3384 __target_capacity = __allocation.count - 1;
3385 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
3386 } catch (...) {
3387 return;
3388 }
3389 #endif // _LIBCPP_HAS_NO_EXCEPTIONS
3390 }
3391 __begin_lifetime(__new_data, __target_capacity + 1);
3392 __now_long = true;
3393 __was_long = __is_long();
3394 __p = __get_pointer();
3395 }
3396 traits_type::copy(std::__to_address(__new_data), std::__to_address(__p), size() + 1);
3397 if (__was_long)
3398 __alloc_traits::deallocate(__alloc(), __p, __cap + 1);
3399 if (__now_long) {
3400 __set_long_cap(__target_capacity + 1);
3401 __set_long_size(__sz);
3402 __set_long_pointer(__new_data);
3403 } else
3404 __set_short_size(__sz);
3405 __annotate_new(__sz);
3406 }
3407
3408 template <class _CharT, class _Traits, class _Allocator>
3409 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::const_reference
3410 basic_string<_CharT, _Traits, _Allocator>::at(size_type __n) const {
3411 if (__n >= size())
3412 __throw_out_of_range();
3413 return (*this)[__n];
3414 }
3415
3416 template <class _CharT, class _Traits, class _Allocator>
3417 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::reference
3418 basic_string<_CharT, _Traits, _Allocator>::at(size_type __n) {
3419 if (__n >= size())
3420 __throw_out_of_range();
3421 return (*this)[__n];
3422 }
3423
3424 template <class _CharT, class _Traits, class _Allocator>
3425 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3426 basic_string<_CharT, _Traits, _Allocator>::copy(value_type* __s, size_type __n, size_type __pos) const {
3427 size_type __sz = size();
3428 if (__pos > __sz)
3429 __throw_out_of_range();
3430 size_type __rlen = std::min(__n, __sz - __pos);
3431 traits_type::copy(__s, data() + __pos, __rlen);
3432 return __rlen;
3433 }
3434
3435 template <class _CharT, class _Traits, class _Allocator>
3436 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::swap(basic_string& __str)
3437 #if _LIBCPP_STD_VER >= 14
3438 _NOEXCEPT
3439 #else
3440 _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value || __is_nothrow_swappable_v<allocator_type>)
3441 #endif
3442 {
3443 _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR(
3444 __alloc_traits::propagate_on_container_swap::value || __alloc_traits::is_always_equal::value ||
3445 __alloc() == __str.__alloc(),
3446 "swapping non-equal allocators");
3447 if (!__is_long())
3448 __annotate_delete();
3449 if (this != &__str && !__str.__is_long())
3450 __str.__annotate_delete();
3451 std::swap(__r_.first(), __str.__r_.first());
3452 std::__swap_allocator(__alloc(), __str.__alloc());
3453 if (!__is_long())
3454 __annotate_new(__get_short_size());
3455 if (this != &__str && !__str.__is_long())
3456 __str.__annotate_new(__str.__get_short_size());
3457 }
3458
3459 // find
3460
3461 template <class _Traits>
3462 struct _LIBCPP_HIDDEN __traits_eq {
3463 typedef typename _Traits::char_type char_type;
3464 _LIBCPP_HIDE_FROM_ABI bool operator()(const char_type& __x, const char_type& __y) _NOEXCEPT {
3465 return _Traits::eq(__x, __y);
3466 }
3467 };
3468
3469 template <class _CharT, class _Traits, class _Allocator>
3470 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3471 basic_string<_CharT, _Traits, _Allocator>::find(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT {
3472 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::find(): received nullptr");
3473 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n);
3474 }
3475
3476 template <class _CharT, class _Traits, class _Allocator>
3477 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3478 basic_string<_CharT, _Traits, _Allocator>::find(const basic_string& __str, size_type __pos) const _NOEXCEPT {
3479 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __str.data(), __pos, __str.size());
3480 }
3481
3482 template <class _CharT, class _Traits, class _Allocator>
3483 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
3484 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3485 basic_string<_CharT, _Traits, _Allocator>::find(const _Tp& __t, size_type __pos) const _NOEXCEPT {
3486 __self_view __sv = __t;
3487 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __sv.data(), __pos, __sv.size());
3488 }
3489
3490 template <class _CharT, class _Traits, class _Allocator>
3491 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3492 basic_string<_CharT, _Traits, _Allocator>::find(const value_type* __s, size_type __pos) const _NOEXCEPT {
3493 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::find(): received nullptr");
3494 return std::__str_find<value_type, size_type, traits_type, npos>(
3495 data(), size(), __s, __pos, traits_type::length(__s));
3496 }
3497
3498 template <class _CharT, class _Traits, class _Allocator>
3499 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3500 basic_string<_CharT, _Traits, _Allocator>::find(value_type __c, size_type __pos) const _NOEXCEPT {
3501 return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos);
3502 }
3503
3504 // rfind
3505
3506 template <class _CharT, class _Traits, class _Allocator>
3507 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3508 basic_string<_CharT, _Traits, _Allocator>::rfind(
3509 const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT {
3510 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::rfind(): received nullptr");
3511 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n);
3512 }
3513
3514 template <class _CharT, class _Traits, class _Allocator>
3515 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3516 basic_string<_CharT, _Traits, _Allocator>::rfind(const basic_string& __str, size_type __pos) const _NOEXCEPT {
3517 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __str.data(), __pos, __str.size());
3518 }
3519
3520 template <class _CharT, class _Traits, class _Allocator>
3521 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
3522 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3523 basic_string<_CharT, _Traits, _Allocator>::rfind(const _Tp& __t, size_type __pos) const _NOEXCEPT {
3524 __self_view __sv = __t;
3525 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __sv.data(), __pos, __sv.size());
3526 }
3527
3528 template <class _CharT, class _Traits, class _Allocator>
3529 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3530 basic_string<_CharT, _Traits, _Allocator>::rfind(const value_type* __s, size_type __pos) const _NOEXCEPT {
3531 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::rfind(): received nullptr");
3532 return std::__str_rfind<value_type, size_type, traits_type, npos>(
3533 data(), size(), __s, __pos, traits_type::length(__s));
3534 }
3535
3536 template <class _CharT, class _Traits, class _Allocator>
3537 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3538 basic_string<_CharT, _Traits, _Allocator>::rfind(value_type __c, size_type __pos) const _NOEXCEPT {
3539 return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos);
3540 }
3541
3542 // find_first_of
3543
3544 template <class _CharT, class _Traits, class _Allocator>
3545 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3546 basic_string<_CharT, _Traits, _Allocator>::find_first_of(
3547 const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT {
3548 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::find_first_of(): received nullptr");
3549 return std::__str_find_first_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n);
3550 }
3551
3552 template <class _CharT, class _Traits, class _Allocator>
3553 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3554 basic_string<_CharT, _Traits, _Allocator>::find_first_of(const basic_string& __str, size_type __pos) const _NOEXCEPT {
3555 return std::__str_find_first_of<value_type, size_type, traits_type, npos>(
3556 data(), size(), __str.data(), __pos, __str.size());
3557 }
3558
3559 template <class _CharT, class _Traits, class _Allocator>
3560 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
3561 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3562 basic_string<_CharT, _Traits, _Allocator>::find_first_of(const _Tp& __t, size_type __pos) const _NOEXCEPT {
3563 __self_view __sv = __t;
3564 return std::__str_find_first_of<value_type, size_type, traits_type, npos>(
3565 data(), size(), __sv.data(), __pos, __sv.size());
3566 }
3567
3568 template <class _CharT, class _Traits, class _Allocator>
3569 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3570 basic_string<_CharT, _Traits, _Allocator>::find_first_of(const value_type* __s, size_type __pos) const _NOEXCEPT {
3571 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::find_first_of(): received nullptr");
3572 return std::__str_find_first_of<value_type, size_type, traits_type, npos>(
3573 data(), size(), __s, __pos, traits_type::length(__s));
3574 }
3575
3576 template <class _CharT, class _Traits, class _Allocator>
3577 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3578 basic_string<_CharT, _Traits, _Allocator>::find_first_of(value_type __c, size_type __pos) const _NOEXCEPT {
3579 return find(__c, __pos);
3580 }
3581
3582 // find_last_of
3583
3584 template <class _CharT, class _Traits, class _Allocator>
3585 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3586 basic_string<_CharT, _Traits, _Allocator>::find_last_of(
3587 const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT {
3588 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::find_last_of(): received nullptr");
3589 return std::__str_find_last_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n);
3590 }
3591
3592 template <class _CharT, class _Traits, class _Allocator>
3593 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3594 basic_string<_CharT, _Traits, _Allocator>::find_last_of(const basic_string& __str, size_type __pos) const _NOEXCEPT {
3595 return std::__str_find_last_of<value_type, size_type, traits_type, npos>(
3596 data(), size(), __str.data(), __pos, __str.size());
3597 }
3598
3599 template <class _CharT, class _Traits, class _Allocator>
3600 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
3601 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3602 basic_string<_CharT, _Traits, _Allocator>::find_last_of(const _Tp& __t, size_type __pos) const _NOEXCEPT {
3603 __self_view __sv = __t;
3604 return std::__str_find_last_of<value_type, size_type, traits_type, npos>(
3605 data(), size(), __sv.data(), __pos, __sv.size());
3606 }
3607
3608 template <class _CharT, class _Traits, class _Allocator>
3609 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3610 basic_string<_CharT, _Traits, _Allocator>::find_last_of(const value_type* __s, size_type __pos) const _NOEXCEPT {
3611 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::find_last_of(): received nullptr");
3612 return std::__str_find_last_of<value_type, size_type, traits_type, npos>(
3613 data(), size(), __s, __pos, traits_type::length(__s));
3614 }
3615
3616 template <class _CharT, class _Traits, class _Allocator>
3617 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3618 basic_string<_CharT, _Traits, _Allocator>::find_last_of(value_type __c, size_type __pos) const _NOEXCEPT {
3619 return rfind(__c, __pos);
3620 }
3621
3622 // find_first_not_of
3623
3624 template <class _CharT, class _Traits, class _Allocator>
3625 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3626 basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(
3627 const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT {
3628 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::find_first_not_of(): received nullptr");
3629 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n);
3630 }
3631
3632 template <class _CharT, class _Traits, class _Allocator>
3633 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3634 basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(
3635 const basic_string& __str, size_type __pos) const _NOEXCEPT {
3636 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>(
3637 data(), size(), __str.data(), __pos, __str.size());
3638 }
3639
3640 template <class _CharT, class _Traits, class _Allocator>
3641 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
3642 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3643 basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const _Tp& __t, size_type __pos) const _NOEXCEPT {
3644 __self_view __sv = __t;
3645 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>(
3646 data(), size(), __sv.data(), __pos, __sv.size());
3647 }
3648
3649 template <class _CharT, class _Traits, class _Allocator>
3650 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3651 basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const value_type* __s, size_type __pos) const _NOEXCEPT {
3652 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::find_first_not_of(): received nullptr");
3653 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>(
3654 data(), size(), __s, __pos, traits_type::length(__s));
3655 }
3656
3657 template <class _CharT, class _Traits, class _Allocator>
3658 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3659 basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(value_type __c, size_type __pos) const _NOEXCEPT {
3660 return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos);
3661 }
3662
3663 // find_last_not_of
3664
3665 template <class _CharT, class _Traits, class _Allocator>
3666 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3667 basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(
3668 const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT {
3669 _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::find_last_not_of(): received nullptr");
3670 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n);
3671 }
3672
3673 template <class _CharT, class _Traits, class _Allocator>
3674 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3675 basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(
3676 const basic_string& __str, size_type __pos) const _NOEXCEPT {
3677 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>(
3678 data(), size(), __str.data(), __pos, __str.size());
3679 }
3680
3681 template <class _CharT, class _Traits, class _Allocator>
3682 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
3683 _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3684 basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const _Tp& __t, size_type __pos) const _NOEXCEPT {
3685 __self_view __sv = __t;
3686 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>(
3687 data(), size(), __sv.data(), __pos, __sv.size());
3688 }
3689
3690 template <class _CharT, class _Traits, class _Allocator>
3691 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3692 basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const value_type* __s, size_type __pos) const _NOEXCEPT {
3693 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::find_last_not_of(): received nullptr");
3694 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>(
3695 data(), size(), __s, __pos, traits_type::length(__s));
3696 }
3697
3698 template <class _CharT, class _Traits, class _Allocator>
3699 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type
3700 basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(value_type __c, size_type __pos) const _NOEXCEPT {
3701 return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos);
3702 }
3703
3704 // compare
3705
3706 template <class _CharT, class _Traits, class _Allocator>
3707 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
3708 _LIBCPP_CONSTEXPR_SINCE_CXX20 int basic_string<_CharT, _Traits, _Allocator>::compare(const _Tp& __t) const _NOEXCEPT {
3709 __self_view __sv = __t;
3710 size_t __lhs_sz = size();
3711 size_t __rhs_sz = __sv.size();
3712 int __result = traits_type::compare(data(), __sv.data(), std::min(__lhs_sz, __rhs_sz));
3713 if (__result != 0)
3714 return __result;
3715 if (__lhs_sz < __rhs_sz)
3716 return -1;
3717 if (__lhs_sz > __rhs_sz)
3718 return 1;
3719 return 0;
3720 }
3721
3722 template <class _CharT, class _Traits, class _Allocator>
3723 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 int
3724 basic_string<_CharT, _Traits, _Allocator>::compare(const basic_string& __str) const _NOEXCEPT {
3725 return compare(__self_view(__str));
3726 }
3727
3728 template <class _CharT, class _Traits, class _Allocator>
3729 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 int basic_string<_CharT, _Traits, _Allocator>::compare(
3730 size_type __pos1, size_type __n1, const value_type* __s, size_type __n2) const {
3731 _LIBCPP_ASSERT_NON_NULL(__n2 == 0 || __s != nullptr, "string::compare(): received nullptr");
3732 size_type __sz = size();
3733 if (__pos1 > __sz || __n2 == npos)
3734 __throw_out_of_range();
3735 size_type __rlen = std::min(__n1, __sz - __pos1);
3736 int __r = traits_type::compare(data() + __pos1, __s, std::min(__rlen, __n2));
3737 if (__r == 0) {
3738 if (__rlen < __n2)
3739 __r = -1;
3740 else if (__rlen > __n2)
3741 __r = 1;
3742 }
3743 return __r;
3744 }
3745
3746 template <class _CharT, class _Traits, class _Allocator>
3747 template <class _Tp, __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value, int> >
3748 _LIBCPP_CONSTEXPR_SINCE_CXX20 int
3749 basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1, size_type __n1, const _Tp& __t) const {
3750 __self_view __sv = __t;
3751 return compare(__pos1, __n1, __sv.data(), __sv.size());
3752 }
3753
3754 template <class _CharT, class _Traits, class _Allocator>
3755 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 int
3756 basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1, size_type __n1, const basic_string& __str) const {
3757 return compare(__pos1, __n1, __str.data(), __str.size());
3758 }
3759
3760 template <class _CharT, class _Traits, class _Allocator>
3761 template <class _Tp,
3762 __enable_if_t<__can_be_converted_to_string_view<_CharT, _Traits, _Tp>::value &&
3763 !__is_same_uncvref<_Tp, basic_string<_CharT, _Traits, _Allocator> >::value,
3764 int> >
3765 _LIBCPP_CONSTEXPR_SINCE_CXX20 int basic_string<_CharT, _Traits, _Allocator>::compare(
3766 size_type __pos1, size_type __n1, const _Tp& __t, size_type __pos2, size_type __n2) const {
3767 __self_view __sv = __t;
3768 return __self_view(*this).substr(__pos1, __n1).compare(__sv.substr(__pos2, __n2));
3769 }
3770
3771 template <class _CharT, class _Traits, class _Allocator>
3772 _LIBCPP_CONSTEXPR_SINCE_CXX20 int basic_string<_CharT, _Traits, _Allocator>::compare(
3773 size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2) const {
3774 return compare(__pos1, __n1, __self_view(__str), __pos2, __n2);
3775 }
3776
3777 template <class _CharT, class _Traits, class _Allocator>
3778 _LIBCPP_CONSTEXPR_SINCE_CXX20 int
3779 basic_string<_CharT, _Traits, _Allocator>::compare(const value_type* __s) const _NOEXCEPT {
3780 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::compare(): received nullptr");
3781 return compare(0, npos, __s, traits_type::length(__s));
3782 }
3783
3784 template <class _CharT, class _Traits, class _Allocator>
3785 _LIBCPP_CONSTEXPR_SINCE_CXX20 int
3786 basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1, size_type __n1, const value_type* __s) const {
3787 _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::compare(): received nullptr");
3788 return compare(__pos1, __n1, __s, traits_type::length(__s));
3789 }
3790
3791 // __invariants
3792
3793 template <class _CharT, class _Traits, class _Allocator>
3794 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 bool basic_string<_CharT, _Traits, _Allocator>::__invariants() const {
3795 if (size() > capacity())
3796 return false;
3797 if (capacity() < __min_cap - 1)
3798 return false;
3799 if (data() == nullptr)
3800 return false;
3801 if (!_Traits::eq(data()[size()], value_type()))
3802 return false;
3803 return true;
3804 }
3805
3806 // __clear_and_shrink
3807
3808 template <class _CharT, class _Traits, class _Allocator>
3809 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::__clear_and_shrink() _NOEXCEPT {
3810 clear();
3811 if (__is_long()) {
3812 __annotate_delete();
3813 __alloc_traits::deallocate(__alloc(), __get_long_pointer(), capacity() + 1);
3814 __r_.first() = __rep();
3815 }
3816 }
3817
3818 // operator==
3819
3820 template <class _CharT, class _Traits, class _Allocator>
3821 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI bool
3822 operator==(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3823 const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT {
3824 #if _LIBCPP_STD_VER >= 20
3825 return basic_string_view<_CharT, _Traits>(__lhs) == basic_string_view<_CharT, _Traits>(__rhs);
3826 #else
3827 size_t __lhs_sz = __lhs.size();
3828 return __lhs_sz == __rhs.size() && _Traits::compare(__lhs.data(), __rhs.data(), __lhs_sz) == 0;
3829 #endif
3830 }
3831
3832 template <class _Allocator>
3833 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI bool
3834 operator==(const basic_string<char, char_traits<char>, _Allocator>& __lhs,
3835 const basic_string<char, char_traits<char>, _Allocator>& __rhs) _NOEXCEPT {
3836 size_t __sz = __lhs.size();
3837 if (__sz != __rhs.size())
3838 return false;
3839 return char_traits<char>::compare(__lhs.data(), __rhs.data(), __sz) == 0;
3840 }
3841
3842 #if _LIBCPP_STD_VER <= 17
3843 template <class _CharT, class _Traits, class _Allocator>
3844 inline _LIBCPP_HIDE_FROM_ABI bool
3845 operator==(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT {
3846 typedef basic_string<_CharT, _Traits, _Allocator> _String;
3847 _LIBCPP_ASSERT_NON_NULL(__lhs != nullptr, "operator==(char*, basic_string): received nullptr");
3848 size_t __lhs_len = _Traits::length(__lhs);
3849 if (__lhs_len != __rhs.size())
3850 return false;
3851 return __rhs.compare(0, _String::npos, __lhs, __lhs_len) == 0;
3852 }
3853 #endif // _LIBCPP_STD_VER <= 17
3854
3855 template <class _CharT, class _Traits, class _Allocator>
3856 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI bool
3857 operator==(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) _NOEXCEPT {
3858 #if _LIBCPP_STD_VER >= 20
3859 return basic_string_view<_CharT, _Traits>(__lhs) == basic_string_view<_CharT, _Traits>(__rhs);
3860 #else
3861 typedef basic_string<_CharT, _Traits, _Allocator> _String;
3862 _LIBCPP_ASSERT_NON_NULL(__rhs != nullptr, "operator==(basic_string, char*): received nullptr");
3863 size_t __rhs_len = _Traits::length(__rhs);
3864 if (__rhs_len != __lhs.size())
3865 return false;
3866 return __lhs.compare(0, _String::npos, __rhs, __rhs_len) == 0;
3867 #endif
3868 }
3869
3870 #if _LIBCPP_STD_VER >= 20
3871
3872 template <class _CharT, class _Traits, class _Allocator>
3873 _LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3874 const basic_string<_CharT, _Traits, _Allocator>& __rhs) noexcept {
3875 return basic_string_view<_CharT, _Traits>(__lhs) <=> basic_string_view<_CharT, _Traits>(__rhs);
3876 }
3877
3878 template <class _CharT, class _Traits, class _Allocator>
3879 _LIBCPP_HIDE_FROM_ABI constexpr auto
3880 operator<=>(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) {
3881 return basic_string_view<_CharT, _Traits>(__lhs) <=> basic_string_view<_CharT, _Traits>(__rhs);
3882 }
3883
3884 #else // _LIBCPP_STD_VER >= 20
3885
3886 template <class _CharT, class _Traits, class _Allocator>
3887 inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3888 const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT {
3889 return !(__lhs == __rhs);
3890 }
3891
3892 template <class _CharT, class _Traits, class _Allocator>
3893 inline _LIBCPP_HIDE_FROM_ABI bool
3894 operator!=(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT {
3895 return !(__lhs == __rhs);
3896 }
3897
3898 template <class _CharT, class _Traits, class _Allocator>
3899 inline _LIBCPP_HIDE_FROM_ABI bool
3900 operator!=(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) _NOEXCEPT {
3901 return !(__lhs == __rhs);
3902 }
3903
3904 // operator<
3905
3906 template <class _CharT, class _Traits, class _Allocator>
3907 inline _LIBCPP_HIDE_FROM_ABI bool operator<(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3908 const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT {
3909 return __lhs.compare(__rhs) < 0;
3910 }
3911
3912 template <class _CharT, class _Traits, class _Allocator>
3913 inline _LIBCPP_HIDE_FROM_ABI bool
3914 operator<(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) _NOEXCEPT {
3915 return __lhs.compare(__rhs) < 0;
3916 }
3917
3918 template <class _CharT, class _Traits, class _Allocator>
3919 inline _LIBCPP_HIDE_FROM_ABI bool
3920 operator<(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT {
3921 return __rhs.compare(__lhs) > 0;
3922 }
3923
3924 // operator>
3925
3926 template <class _CharT, class _Traits, class _Allocator>
3927 inline _LIBCPP_HIDE_FROM_ABI bool operator>(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3928 const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT {
3929 return __rhs < __lhs;
3930 }
3931
3932 template <class _CharT, class _Traits, class _Allocator>
3933 inline _LIBCPP_HIDE_FROM_ABI bool
3934 operator>(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) _NOEXCEPT {
3935 return __rhs < __lhs;
3936 }
3937
3938 template <class _CharT, class _Traits, class _Allocator>
3939 inline _LIBCPP_HIDE_FROM_ABI bool
3940 operator>(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT {
3941 return __rhs < __lhs;
3942 }
3943
3944 // operator<=
3945
3946 template <class _CharT, class _Traits, class _Allocator>
3947 inline _LIBCPP_HIDE_FROM_ABI bool operator<=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3948 const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT {
3949 return !(__rhs < __lhs);
3950 }
3951
3952 template <class _CharT, class _Traits, class _Allocator>
3953 inline _LIBCPP_HIDE_FROM_ABI bool
3954 operator<=(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) _NOEXCEPT {
3955 return !(__rhs < __lhs);
3956 }
3957
3958 template <class _CharT, class _Traits, class _Allocator>
3959 inline _LIBCPP_HIDE_FROM_ABI bool
3960 operator<=(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT {
3961 return !(__rhs < __lhs);
3962 }
3963
3964 // operator>=
3965
3966 template <class _CharT, class _Traits, class _Allocator>
3967 inline _LIBCPP_HIDE_FROM_ABI bool operator>=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3968 const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT {
3969 return !(__lhs < __rhs);
3970 }
3971
3972 template <class _CharT, class _Traits, class _Allocator>
3973 inline _LIBCPP_HIDE_FROM_ABI bool
3974 operator>=(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) _NOEXCEPT {
3975 return !(__lhs < __rhs);
3976 }
3977
3978 template <class _CharT, class _Traits, class _Allocator>
3979 inline _LIBCPP_HIDE_FROM_ABI bool
3980 operator>=(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT {
3981 return !(__lhs < __rhs);
3982 }
3983 #endif // _LIBCPP_STD_VER >= 20
3984
3985 // operator +
3986
3987 template <class _CharT, class _Traits, class _Allocator>
3988 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
3989 operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3990 const basic_string<_CharT, _Traits, _Allocator>& __rhs) {
3991 using _String = basic_string<_CharT, _Traits, _Allocator>;
3992 auto __lhs_sz = __lhs.size();
3993 auto __rhs_sz = __rhs.size();
3994 _String __r(__uninitialized_size_tag(),
3995 __lhs_sz + __rhs_sz,
3996 _String::__alloc_traits::select_on_container_copy_construction(__lhs.get_allocator()));
3997 auto __ptr = std::__to_address(__r.__get_pointer());
3998 _Traits::copy(__ptr, __lhs.data(), __lhs_sz);
3999 _Traits::copy(__ptr + __lhs_sz, __rhs.data(), __rhs_sz);
4000 _Traits::assign(__ptr + __lhs_sz + __rhs_sz, 1, _CharT());
4001 return __r;
4002 }
4003
4004 template <class _CharT, class _Traits, class _Allocator>
4005 _LIBCPP_HIDDEN _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
4006 operator+(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) {
4007 using _String = basic_string<_CharT, _Traits, _Allocator>;
4008 auto __lhs_sz = _Traits::length(__lhs);
4009 auto __rhs_sz = __rhs.size();
4010 _String __r(__uninitialized_size_tag(),
4011 __lhs_sz + __rhs_sz,
4012 _String::__alloc_traits::select_on_container_copy_construction(__rhs.get_allocator()));
4013 auto __ptr = std::__to_address(__r.__get_pointer());
4014 _Traits::copy(__ptr, __lhs, __lhs_sz);
4015 _Traits::copy(__ptr + __lhs_sz, __rhs.data(), __rhs_sz);
4016 _Traits::assign(__ptr + __lhs_sz + __rhs_sz, 1, _CharT());
4017 return __r;
4018 }
4019
4020 template <class _CharT, class _Traits, class _Allocator>
4021 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
4022 operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) {
4023 using _String = basic_string<_CharT, _Traits, _Allocator>;
4024 typename _String::size_type __rhs_sz = __rhs.size();
4025 _String __r(__uninitialized_size_tag(),
4026 __rhs_sz + 1,
4027 _String::__alloc_traits::select_on_container_copy_construction(__rhs.get_allocator()));
4028 auto __ptr = std::__to_address(__r.__get_pointer());
4029 _Traits::assign(__ptr, 1, __lhs);
4030 _Traits::copy(__ptr + 1, __rhs.data(), __rhs_sz);
4031 _Traits::assign(__ptr + 1 + __rhs_sz, 1, _CharT());
4032 return __r;
4033 }
4034
4035 template <class _CharT, class _Traits, class _Allocator>
4036 inline _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
4037 operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) {
4038 using _String = basic_string<_CharT, _Traits, _Allocator>;
4039 typename _String::size_type __lhs_sz = __lhs.size();
4040 typename _String::size_type __rhs_sz = _Traits::length(__rhs);
4041 _String __r(__uninitialized_size_tag(),
4042 __lhs_sz + __rhs_sz,
4043 _String::__alloc_traits::select_on_container_copy_construction(__lhs.get_allocator()));
4044 auto __ptr = std::__to_address(__r.__get_pointer());
4045 _Traits::copy(__ptr, __lhs.data(), __lhs_sz);
4046 _Traits::copy(__ptr + __lhs_sz, __rhs, __rhs_sz);
4047 _Traits::assign(__ptr + __lhs_sz + __rhs_sz, 1, _CharT());
4048 return __r;
4049 }
4050
4051 template <class _CharT, class _Traits, class _Allocator>
4052 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
4053 operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, _CharT __rhs) {
4054 using _String = basic_string<_CharT, _Traits, _Allocator>;
4055 typename _String::size_type __lhs_sz = __lhs.size();
4056 _String __r(__uninitialized_size_tag(),
4057 __lhs_sz + 1,
4058 _String::__alloc_traits::select_on_container_copy_construction(__lhs.get_allocator()));
4059 auto __ptr = std::__to_address(__r.__get_pointer());
4060 _Traits::copy(__ptr, __lhs.data(), __lhs_sz);
4061 _Traits::assign(__ptr + __lhs_sz, 1, __rhs);
4062 _Traits::assign(__ptr + 1 + __lhs_sz, 1, _CharT());
4063 return __r;
4064 }
4065
4066 #ifndef _LIBCPP_CXX03_LANG
4067
4068 template <class _CharT, class _Traits, class _Allocator>
4069 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
4070 operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) {
4071 return std::move(__lhs.append(__rhs));
4072 }
4073
4074 template <class _CharT, class _Traits, class _Allocator>
4075 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
4076 operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs) {
4077 return std::move(__rhs.insert(0, __lhs));
4078 }
4079
4080 template <class _CharT, class _Traits, class _Allocator>
4081 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
4082 operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs) {
4083 return std::move(__lhs.append(__rhs));
4084 }
4085
4086 template <class _CharT, class _Traits, class _Allocator>
4087 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
4088 operator+(const _CharT* __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs) {
4089 return std::move(__rhs.insert(0, __lhs));
4090 }
4091
4092 template <class _CharT, class _Traits, class _Allocator>
4093 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
4094 operator+(_CharT __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs) {
4095 __rhs.insert(__rhs.begin(), __lhs);
4096 return std::move(__rhs);
4097 }
4098
4099 template <class _CharT, class _Traits, class _Allocator>
4100 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
4101 operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, const _CharT* __rhs) {
4102 return std::move(__lhs.append(__rhs));
4103 }
4104
4105 template <class _CharT, class _Traits, class _Allocator>
4106 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>
4107 operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, _CharT __rhs) {
4108 __lhs.push_back(__rhs);
4109 return std::move(__lhs);
4110 }
4111
4112 #endif // _LIBCPP_CXX03_LANG
4113
4114 #if _LIBCPP_STD_VER >= 26
4115
4116 template <class _CharT, class _Traits, class _Allocator>
4117 _LIBCPP_HIDE_FROM_ABI constexpr basic_string<_CharT, _Traits, _Allocator>
4118 operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
4119 type_identity_t<basic_string_view<_CharT, _Traits>> __rhs) {
4120 using _String = basic_string<_CharT, _Traits, _Allocator>;
4121 typename _String::size_type __lhs_sz = __lhs.size();
4122 typename _String::size_type __rhs_sz = __rhs.size();
4123 _String __r(__uninitialized_size_tag(),
4124 __lhs_sz + __rhs_sz,
4125 _String::__alloc_traits::select_on_container_copy_construction(__lhs.get_allocator()));
4126 auto __ptr = std::__to_address(__r.__get_pointer());
4127 _Traits::copy(__ptr, __lhs.data(), __lhs_sz);
4128 _Traits::copy(__ptr + __lhs_sz, __rhs.data(), __rhs_sz);
4129 _Traits::assign(__ptr + __lhs_sz + __rhs_sz, 1, _CharT());
4130 return __r;
4131 }
4132
4133 template <class _CharT, class _Traits, class _Allocator>
4134 _LIBCPP_HIDE_FROM_ABI constexpr basic_string<_CharT, _Traits, _Allocator>
4135 operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs,
4136 type_identity_t<basic_string_view<_CharT, _Traits>> __rhs) {
4137 __lhs.append(__rhs);
4138 return std::move(__lhs);
4139 }
4140
4141 template <class _CharT, class _Traits, class _Allocator>
4142 _LIBCPP_HIDE_FROM_ABI constexpr basic_string<_CharT, _Traits, _Allocator>
4143 operator+(type_identity_t<basic_string_view<_CharT, _Traits>> __lhs,
4144 const basic_string<_CharT, _Traits, _Allocator>& __rhs) {
4145 using _String = basic_string<_CharT, _Traits, _Allocator>;
4146 typename _String::size_type __lhs_sz = __lhs.size();
4147 typename _String::size_type __rhs_sz = __rhs.size();
4148 _String __r(__uninitialized_size_tag(),
4149 __lhs_sz + __rhs_sz,
4150 _String::__alloc_traits::select_on_container_copy_construction(__rhs.get_allocator()));
4151 auto __ptr = std::__to_address(__r.__get_pointer());
4152 _Traits::copy(__ptr, __lhs.data(), __lhs_sz);
4153 _Traits::copy(__ptr + __lhs_sz, __rhs.data(), __rhs_sz);
4154 _Traits::assign(__ptr + __lhs_sz + __rhs_sz, 1, _CharT());
4155 return __r;
4156 }
4157
4158 template <class _CharT, class _Traits, class _Allocator>
4159 _LIBCPP_HIDE_FROM_ABI constexpr basic_string<_CharT, _Traits, _Allocator>
4160 operator+(type_identity_t<basic_string_view<_CharT, _Traits>> __lhs,
4161 basic_string<_CharT, _Traits, _Allocator>&& __rhs) {
4162 __rhs.insert(0, __lhs);
4163 return std::move(__rhs);
4164 }
4165
4166 #endif // _LIBCPP_STD_VER >= 26
4167
4168 // swap
4169
4170 template <class _CharT, class _Traits, class _Allocator>
4171 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
4172 swap(basic_string<_CharT, _Traits, _Allocator>& __lhs, basic_string<_CharT, _Traits, _Allocator>& __rhs)
4173 _NOEXCEPT_(_NOEXCEPT_(__lhs.swap(__rhs))) {
4174 __lhs.swap(__rhs);
4175 }
4176
4177 _LIBCPP_EXPORTED_FROM_ABI int stoi(const string& __str, size_t* __idx = nullptr, int __base = 10);
4178 _LIBCPP_EXPORTED_FROM_ABI long stol(const string& __str, size_t* __idx = nullptr, int __base = 10);
4179 _LIBCPP_EXPORTED_FROM_ABI unsigned long stoul(const string& __str, size_t* __idx = nullptr, int __base = 10);
4180 _LIBCPP_EXPORTED_FROM_ABI long long stoll(const string& __str, size_t* __idx = nullptr, int __base = 10);
4181 _LIBCPP_EXPORTED_FROM_ABI unsigned long long stoull(const string& __str, size_t* __idx = nullptr, int __base = 10);
4182
4183 _LIBCPP_EXPORTED_FROM_ABI float stof(const string& __str, size_t* __idx = nullptr);
4184 _LIBCPP_EXPORTED_FROM_ABI double stod(const string& __str, size_t* __idx = nullptr);
4185 _LIBCPP_EXPORTED_FROM_ABI long double stold(const string& __str, size_t* __idx = nullptr);
4186
4187 _LIBCPP_EXPORTED_FROM_ABI string to_string(int __val);
4188 _LIBCPP_EXPORTED_FROM_ABI string to_string(unsigned __val);
4189 _LIBCPP_EXPORTED_FROM_ABI string to_string(long __val);
4190 _LIBCPP_EXPORTED_FROM_ABI string to_string(unsigned long __val);
4191 _LIBCPP_EXPORTED_FROM_ABI string to_string(long long __val);
4192 _LIBCPP_EXPORTED_FROM_ABI string to_string(unsigned long long __val);
4193 _LIBCPP_EXPORTED_FROM_ABI string to_string(float __val);
4194 _LIBCPP_EXPORTED_FROM_ABI string to_string(double __val);
4195 _LIBCPP_EXPORTED_FROM_ABI string to_string(long double __val);
4196
4197 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
4198 _LIBCPP_EXPORTED_FROM_ABI int stoi(const wstring& __str, size_t* __idx = nullptr, int __base = 10);
4199 _LIBCPP_EXPORTED_FROM_ABI long stol(const wstring& __str, size_t* __idx = nullptr, int __base = 10);
4200 _LIBCPP_EXPORTED_FROM_ABI unsigned long stoul(const wstring& __str, size_t* __idx = nullptr, int __base = 10);
4201 _LIBCPP_EXPORTED_FROM_ABI long long stoll(const wstring& __str, size_t* __idx = nullptr, int __base = 10);
4202 _LIBCPP_EXPORTED_FROM_ABI unsigned long long stoull(const wstring& __str, size_t* __idx = nullptr, int __base = 10);
4203
4204 _LIBCPP_EXPORTED_FROM_ABI float stof(const wstring& __str, size_t* __idx = nullptr);
4205 _LIBCPP_EXPORTED_FROM_ABI double stod(const wstring& __str, size_t* __idx = nullptr);
4206 _LIBCPP_EXPORTED_FROM_ABI long double stold(const wstring& __str, size_t* __idx = nullptr);
4207
4208 _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(int __val);
4209 _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(unsigned __val);
4210 _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(long __val);
4211 _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(unsigned long __val);
4212 _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(long long __val);
4213 _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(unsigned long long __val);
4214 _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(float __val);
4215 _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(double __val);
4216 _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(long double __val);
4217 #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
4218
4219 template <class _CharT, class _Traits, class _Allocator>
4220 _LIBCPP_TEMPLATE_DATA_VIS const typename basic_string<_CharT, _Traits, _Allocator>::size_type
4221 basic_string<_CharT, _Traits, _Allocator>::npos;
4222
4223 template <class _CharT, class _Allocator>
4224 struct __string_hash : public __unary_function<basic_string<_CharT, char_traits<_CharT>, _Allocator>, size_t> {
4225 _LIBCPP_HIDE_FROM_ABI size_t
4226 operator()(const basic_string<_CharT, char_traits<_CharT>, _Allocator>& __val) const _NOEXCEPT {
4227 return std::__do_string_hash(__val.data(), __val.data() + __val.size());
4228 }
4229 };
4230
4231 template <class _Allocator>
4232 struct hash<basic_string<char, char_traits<char>, _Allocator> > : __string_hash<char, _Allocator> {};
4233
4234 #ifndef _LIBCPP_HAS_NO_CHAR8_T
4235 template <class _Allocator>
4236 struct hash<basic_string<char8_t, char_traits<char8_t>, _Allocator> > : __string_hash<char8_t, _Allocator> {};
4237 #endif
4238
4239 template <class _Allocator>
4240 struct hash<basic_string<char16_t, char_traits<char16_t>, _Allocator> > : __string_hash<char16_t, _Allocator> {};
4241
4242 template <class _Allocator>
4243 struct hash<basic_string<char32_t, char_traits<char32_t>, _Allocator> > : __string_hash<char32_t, _Allocator> {};
4244
4245 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
4246 template <class _Allocator>
4247 struct hash<basic_string<wchar_t, char_traits<wchar_t>, _Allocator> > : __string_hash<wchar_t, _Allocator> {};
4248 #endif
4249
4250 template <class _CharT, class _Traits, class _Allocator>
4251 _LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
4252 operator<<(basic_ostream<_CharT, _Traits>& __os, const basic_string<_CharT, _Traits, _Allocator>& __str);
4253
4254 template <class _CharT, class _Traits, class _Allocator>
4255 _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
4256 operator>>(basic_istream<_CharT, _Traits>& __is, basic_string<_CharT, _Traits, _Allocator>& __str);
4257
4258 template <class _CharT, class _Traits, class _Allocator>
4259 _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
4260 getline(basic_istream<_CharT, _Traits>& __is, basic_string<_CharT, _Traits, _Allocator>& __str, _CharT __dlm);
4261
4262 template <class _CharT, class _Traits, class _Allocator>
4263 inline _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
4264 getline(basic_istream<_CharT, _Traits>& __is, basic_string<_CharT, _Traits, _Allocator>& __str);
4265
4266 template <class _CharT, class _Traits, class _Allocator>
4267 inline _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
4268 getline(basic_istream<_CharT, _Traits>&& __is, basic_string<_CharT, _Traits, _Allocator>& __str, _CharT __dlm);
4269
4270 template <class _CharT, class _Traits, class _Allocator>
4271 inline _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
4272 getline(basic_istream<_CharT, _Traits>&& __is, basic_string<_CharT, _Traits, _Allocator>& __str);
4273
4274 #if _LIBCPP_STD_VER >= 20
4275 template <class _CharT, class _Traits, class _Allocator, class _Up>
4276 inline _LIBCPP_HIDE_FROM_ABI typename basic_string<_CharT, _Traits, _Allocator>::size_type
4277 erase(basic_string<_CharT, _Traits, _Allocator>& __str, const _Up& __v) {
4278 auto __old_size = __str.size();
4279 __str.erase(std::remove(__str.begin(), __str.end(), __v), __str.end());
4280 return __old_size - __str.size();
4281 }
4282
4283 template <class _CharT, class _Traits, class _Allocator, class _Predicate>
4284 inline _LIBCPP_HIDE_FROM_ABI typename basic_string<_CharT, _Traits, _Allocator>::size_type
4285 erase_if(basic_string<_CharT, _Traits, _Allocator>& __str, _Predicate __pred) {
4286 auto __old_size = __str.size();
4287 __str.erase(std::remove_if(__str.begin(), __str.end(), __pred), __str.end());
4288 return __old_size - __str.size();
4289 }
4290 #endif
4291
4292 #if _LIBCPP_STD_VER >= 14
4293 // Literal suffixes for basic_string [basic.string.literals]
4294 inline namespace literals {
4295 inline namespace string_literals {
4296 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<char>
4297 operator""s(const char* __str, size_t __len) {
4298 return basic_string<char>(__str, __len);
4299 }
4300
4301 # ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
4302 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<wchar_t>
4303 operator""s(const wchar_t* __str, size_t __len) {
4304 return basic_string<wchar_t>(__str, __len);
4305 }
4306 # endif
4307
4308 # ifndef _LIBCPP_HAS_NO_CHAR8_T
4309 inline _LIBCPP_HIDE_FROM_ABI constexpr basic_string<char8_t> operator""s(const char8_t* __str, size_t __len) {
4310 return basic_string<char8_t>(__str, __len);
4311 }
4312 # endif
4313
4314 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<char16_t>
4315 operator""s(const char16_t* __str, size_t __len) {
4316 return basic_string<char16_t>(__str, __len);
4317 }
4318
4319 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<char32_t>
4320 operator""s(const char32_t* __str, size_t __len) {
4321 return basic_string<char32_t>(__str, __len);
4322 }
4323 } // namespace string_literals
4324 } // namespace literals
4325
4326 # if _LIBCPP_STD_VER >= 20
4327 template <>
4328 inline constexpr bool __format::__enable_insertable<std::basic_string<char>> = true;
4329 # ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
4330 template <>
4331 inline constexpr bool __format::__enable_insertable<std::basic_string<wchar_t>> = true;
4332 # endif
4333 # endif
4334
4335 #endif
4336
4337 _LIBCPP_END_NAMESPACE_STD
4338
4339 _LIBCPP_POP_MACROS
4340
4341 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
4342 # include <__cxx03/algorithm>
4343 # include <__cxx03/concepts>
4344 # include <__cxx03/cstdlib>
4345 # include <__cxx03/iterator>
4346 # include <__cxx03/new>
4347 # include <__cxx03/type_traits>
4348 # include <__cxx03/typeinfo>
4349 # include <__cxx03/utility>
4350 #endif
4351
4352 #endif // _LIBCPP___CXX03_STRING
