v1/__memory/ranges_uninitialized_algorithms.h

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___MEMORY_RANGES_UNINITIALIZED_ALGORITHMS_H
0011 #define _LIBCPP___MEMORY_RANGES_UNINITIALIZED_ALGORITHMS_H
0012
0013 #include <__algorithm/in_out_result.h>
0014 #include <__concepts/constructible.h>
0015 #include <__config>
0016 #include <__iterator/concepts.h>
0017 #include <__iterator/incrementable_traits.h>
0018 #include <__iterator/iter_move.h>
0019 #include <__iterator/iterator_traits.h>
0020 #include <__iterator/readable_traits.h>
0021 #include <__memory/concepts.h>
0022 #include <__memory/uninitialized_algorithms.h>
0023 #include <__ranges/access.h>
0024 #include <__ranges/concepts.h>
0025 #include <__ranges/dangling.h>
0026 #include <__type_traits/remove_reference.h>
0027 #include <__utility/move.h>
0028
0029 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0030 #  pragma GCC system_header
0031 #endif
0032
0033 _LIBCPP_PUSH_MACROS
0034 #include <__undef_macros>
0035
0036 _LIBCPP_BEGIN_NAMESPACE_STD
0037
0038 #if _LIBCPP_STD_VER >= 20
0039
0040 namespace ranges {
0041
0042 // uninitialized_default_construct
0043
0044 struct __uninitialized_default_construct {
0045   template <__nothrow_forward_iterator _ForwardIterator, __nothrow_sentinel_for<_ForwardIterator> _Sentinel>
0046     requires default_initializable<iter_value_t<_ForwardIterator>>
0047   _LIBCPP_HIDE_FROM_ABI _ForwardIterator operator()(_ForwardIterator __first, _Sentinel __last) const {
0048     using _ValueType = remove_reference_t<iter_reference_t<_ForwardIterator>>;
0049     return std::__uninitialized_default_construct<_ValueType>(std::move(__first), std::move(__last));
0050   }
0051
0052   template <__nothrow_forward_range _ForwardRange>
0053     requires default_initializable<range_value_t<_ForwardRange>>
0054   _LIBCPP_HIDE_FROM_ABI borrowed_iterator_t<_ForwardRange> operator()(_ForwardRange&& __range) const {
0055     return (*this)(ranges::begin(__range), ranges::end(__range));
0056   }
0057 };
0058
0059 inline namespace __cpo {
0060 inline constexpr auto uninitialized_default_construct = __uninitialized_default_construct{};
0061 } // namespace __cpo
0062
0063 // uninitialized_default_construct_n
0064
0065 struct __uninitialized_default_construct_n {
0066   template <__nothrow_forward_iterator _ForwardIterator>
0067     requires default_initializable<iter_value_t<_ForwardIterator>>
0068   _LIBCPP_HIDE_FROM_ABI _ForwardIterator
0069   operator()(_ForwardIterator __first, iter_difference_t<_ForwardIterator> __n) const {
0070     using _ValueType = remove_reference_t<iter_reference_t<_ForwardIterator>>;
0071     return std::__uninitialized_default_construct_n<_ValueType>(std::move(__first), __n);
0072   }
0073 };
0074
0075 inline namespace __cpo {
0076 inline constexpr auto uninitialized_default_construct_n = __uninitialized_default_construct_n{};
0077 } // namespace __cpo
0078
0079 // uninitialized_value_construct
0080
0081 struct __uninitialized_value_construct {
0082   template <__nothrow_forward_iterator _ForwardIterator, __nothrow_sentinel_for<_ForwardIterator> _Sentinel>
0083     requires default_initializable<iter_value_t<_ForwardIterator>>
0084   _LIBCPP_HIDE_FROM_ABI _ForwardIterator operator()(_ForwardIterator __first, _Sentinel __last) const {
0085     using _ValueType = remove_reference_t<iter_reference_t<_ForwardIterator>>;
0086     return std::__uninitialized_value_construct<_ValueType>(std::move(__first), std::move(__last));
0087   }
0088
0089   template <__nothrow_forward_range _ForwardRange>
0090     requires default_initializable<range_value_t<_ForwardRange>>
0091   _LIBCPP_HIDE_FROM_ABI borrowed_iterator_t<_ForwardRange> operator()(_ForwardRange&& __range) const {
0092     return (*this)(ranges::begin(__range), ranges::end(__range));
0093   }
0094 };
0095
0096 inline namespace __cpo {
0097 inline constexpr auto uninitialized_value_construct = __uninitialized_value_construct{};
0098 } // namespace __cpo
0099
0100 // uninitialized_value_construct_n
0101
0102 struct __uninitialized_value_construct_n {
0103   template <__nothrow_forward_iterator _ForwardIterator>
0104     requires default_initializable<iter_value_t<_ForwardIterator>>
0105   _LIBCPP_HIDE_FROM_ABI _ForwardIterator
0106   operator()(_ForwardIterator __first, iter_difference_t<_ForwardIterator> __n) const {
0107     using _ValueType = remove_reference_t<iter_reference_t<_ForwardIterator>>;
0108     return std::__uninitialized_value_construct_n<_ValueType>(std::move(__first), __n);
0109   }
0110 };
0111
0112 inline namespace __cpo {
0113 inline constexpr auto uninitialized_value_construct_n = __uninitialized_value_construct_n{};
0114 } // namespace __cpo
0115
0116 // uninitialized_fill
0117
0118 struct __uninitialized_fill {
0119   template <__nothrow_forward_iterator _ForwardIterator, __nothrow_sentinel_for<_ForwardIterator> _Sentinel, class _Tp>
0120     requires constructible_from<iter_value_t<_ForwardIterator>, const _Tp&>
0121   _LIBCPP_HIDE_FROM_ABI _ForwardIterator operator()(_ForwardIterator __first, _Sentinel __last, const _Tp& __x) const {
0122     using _ValueType = remove_reference_t<iter_reference_t<_ForwardIterator>>;
0123     return std::__uninitialized_fill<_ValueType>(std::move(__first), std::move(__last), __x);
0124   }
0125
0126   template <__nothrow_forward_range _ForwardRange, class _Tp>
0127     requires constructible_from<range_value_t<_ForwardRange>, const _Tp&>
0128   _LIBCPP_HIDE_FROM_ABI borrowed_iterator_t<_ForwardRange> operator()(_ForwardRange&& __range, const _Tp& __x) const {
0129     return (*this)(ranges::begin(__range), ranges::end(__range), __x);
0130   }
0131 };
0132
0133 inline namespace __cpo {
0134 inline constexpr auto uninitialized_fill = __uninitialized_fill{};
0135 } // namespace __cpo
0136
0137 // uninitialized_fill_n
0138
0139 struct __uninitialized_fill_n {
0140   template <__nothrow_forward_iterator _ForwardIterator, class _Tp>
0141     requires constructible_from<iter_value_t<_ForwardIterator>, const _Tp&>
0142   _LIBCPP_HIDE_FROM_ABI _ForwardIterator
0143   operator()(_ForwardIterator __first, iter_difference_t<_ForwardIterator> __n, const _Tp& __x) const {
0144     using _ValueType = remove_reference_t<iter_reference_t<_ForwardIterator>>;
0145     return std::__uninitialized_fill_n<_ValueType>(std::move(__first), __n, __x);
0146   }
0147 };
0148
0149 inline namespace __cpo {
0150 inline constexpr auto uninitialized_fill_n = __uninitialized_fill_n{};
0151 } // namespace __cpo
0152
0153 // uninitialized_copy
0154
0155 template <class _InputIterator, class _OutputIterator>
0156 using uninitialized_copy_result = in_out_result<_InputIterator, _OutputIterator>;
0157
0158 struct __uninitialized_copy {
0159   template <input_iterator _InputIterator,
0160             sentinel_for<_InputIterator> _Sentinel1,
0161             __nothrow_forward_iterator _OutputIterator,
0162             __nothrow_sentinel_for<_OutputIterator> _Sentinel2>
0163     requires constructible_from<iter_value_t<_OutputIterator>, iter_reference_t<_InputIterator>>
0164   _LIBCPP_HIDE_FROM_ABI uninitialized_copy_result<_InputIterator, _OutputIterator>
0165   operator()(_InputIterator __ifirst, _Sentinel1 __ilast, _OutputIterator __ofirst, _Sentinel2 __olast) const {
0166     using _ValueType = remove_reference_t<iter_reference_t<_OutputIterator>>;
0167
0168     auto __stop_copying = [&__olast](auto&& __out_iter) -> bool { return __out_iter == __olast; };
0169     auto __result       = std::__uninitialized_copy<_ValueType>(
0170         std::move(__ifirst), std::move(__ilast), std::move(__ofirst), __stop_copying);
0171     return {std::move(__result.first), std::move(__result.second)};
0172   }
0173
0174   template <input_range _InputRange, __nothrow_forward_range _OutputRange>
0175     requires constructible_from<range_value_t<_OutputRange>, range_reference_t<_InputRange>>
0176   _LIBCPP_HIDE_FROM_ABI uninitialized_copy_result<borrowed_iterator_t<_InputRange>, borrowed_iterator_t<_OutputRange>>
0177   operator()(_InputRange&& __in_range, _OutputRange&& __out_range) const {
0178     return (*this)(
0179         ranges::begin(__in_range), ranges::end(__in_range), ranges::begin(__out_range), ranges::end(__out_range));
0180   }
0181 };
0182
0183 inline namespace __cpo {
0184 inline constexpr auto uninitialized_copy = __uninitialized_copy{};
0185 } // namespace __cpo
0186
0187 // uninitialized_copy_n
0188
0189 template <class _InputIterator, class _OutputIterator>
0190 using uninitialized_copy_n_result = in_out_result<_InputIterator, _OutputIterator>;
0191
0192 struct __uninitialized_copy_n {
0193   template <input_iterator _InputIterator,
0194             __nothrow_forward_iterator _OutputIterator,
0195             __nothrow_sentinel_for<_OutputIterator> _Sentinel>
0196     requires constructible_from<iter_value_t<_OutputIterator>, iter_reference_t<_InputIterator>>
0197   _LIBCPP_HIDE_FROM_ABI uninitialized_copy_n_result<_InputIterator, _OutputIterator>
0198   operator()(_InputIterator __ifirst,
0199              iter_difference_t<_InputIterator> __n,
0200              _OutputIterator __ofirst,
0201              _Sentinel __olast) const {
0202     using _ValueType    = remove_reference_t<iter_reference_t<_OutputIterator>>;
0203     auto __stop_copying = [&__olast](auto&& __out_iter) -> bool { return __out_iter == __olast; };
0204     auto __result =
0205         std::__uninitialized_copy_n<_ValueType>(std::move(__ifirst), __n, std::move(__ofirst), __stop_copying);
0206     return {std::move(__result.first), std::move(__result.second)};
0207   }
0208 };
0209
0210 inline namespace __cpo {
0211 inline constexpr auto uninitialized_copy_n = __uninitialized_copy_n{};
0212 } // namespace __cpo
0213
0214 // uninitialized_move
0215
0216 template <class _InputIterator, class _OutputIterator>
0217 using uninitialized_move_result = in_out_result<_InputIterator, _OutputIterator>;
0218
0219 struct __uninitialized_move {
0220   template <input_iterator _InputIterator,
0221             sentinel_for<_InputIterator> _Sentinel1,
0222             __nothrow_forward_iterator _OutputIterator,
0223             __nothrow_sentinel_for<_OutputIterator> _Sentinel2>
0224     requires constructible_from<iter_value_t<_OutputIterator>, iter_rvalue_reference_t<_InputIterator>>
0225   _LIBCPP_HIDE_FROM_ABI uninitialized_move_result<_InputIterator, _OutputIterator>
0226   operator()(_InputIterator __ifirst, _Sentinel1 __ilast, _OutputIterator __ofirst, _Sentinel2 __olast) const {
0227     using _ValueType   = remove_reference_t<iter_reference_t<_OutputIterator>>;
0228     auto __iter_move   = [](auto&& __iter) -> decltype(auto) { return ranges::iter_move(__iter); };
0229     auto __stop_moving = [&__olast](auto&& __out_iter) -> bool { return __out_iter == __olast; };
0230     auto __result      = std::__uninitialized_move<_ValueType>(
0231         std::move(__ifirst), std::move(__ilast), std::move(__ofirst), __stop_moving, __iter_move);
0232     return {std::move(__result.first), std::move(__result.second)};
0233   }
0234
0235   template <input_range _InputRange, __nothrow_forward_range _OutputRange>
0236     requires constructible_from<range_value_t<_OutputRange>, range_rvalue_reference_t<_InputRange>>
0237   _LIBCPP_HIDE_FROM_ABI uninitialized_move_result<borrowed_iterator_t<_InputRange>, borrowed_iterator_t<_OutputRange>>
0238   operator()(_InputRange&& __in_range, _OutputRange&& __out_range) const {
0239     return (*this)(
0240         ranges::begin(__in_range), ranges::end(__in_range), ranges::begin(__out_range), ranges::end(__out_range));
0241   }
0242 };
0243
0244 inline namespace __cpo {
0245 inline constexpr auto uninitialized_move = __uninitialized_move{};
0246 } // namespace __cpo
0247
0248 // uninitialized_move_n
0249
0250 template <class _InputIterator, class _OutputIterator>
0251 using uninitialized_move_n_result = in_out_result<_InputIterator, _OutputIterator>;
0252
0253 struct __uninitialized_move_n {
0254   template <input_iterator _InputIterator,
0255             __nothrow_forward_iterator _OutputIterator,
0256             __nothrow_sentinel_for<_OutputIterator> _Sentinel>
0257     requires constructible_from<iter_value_t<_OutputIterator>, iter_rvalue_reference_t<_InputIterator>>
0258   _LIBCPP_HIDE_FROM_ABI uninitialized_move_n_result<_InputIterator, _OutputIterator>
0259   operator()(_InputIterator __ifirst,
0260              iter_difference_t<_InputIterator> __n,
0261              _OutputIterator __ofirst,
0262              _Sentinel __olast) const {
0263     using _ValueType   = remove_reference_t<iter_reference_t<_OutputIterator>>;
0264     auto __iter_move   = [](auto&& __iter) -> decltype(auto) { return ranges::iter_move(__iter); };
0265     auto __stop_moving = [&__olast](auto&& __out_iter) -> bool { return __out_iter == __olast; };
0266     auto __result      = std::__uninitialized_move_n<_ValueType>(
0267         std::move(__ifirst), __n, std::move(__ofirst), __stop_moving, __iter_move);
0268     return {std::move(__result.first), std::move(__result.second)};
0269   }
0270 };
0271
0272 inline namespace __cpo {
0273 inline constexpr auto uninitialized_move_n = __uninitialized_move_n{};
0274 } // namespace __cpo
0275
0276 } // namespace ranges
0277
0278 #endif // _LIBCPP_STD_VER >= 20
0279
0280 _LIBCPP_END_NAMESPACE_STD
0281
0282 _LIBCPP_POP_MACROS
0283
0284 #endif // _LIBCPP___MEMORY_RANGES_UNINITIALIZED_ALGORITHMS_H