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 ///////////////////////////////////////////////////////////////////////////////
 //
 // Copyright (c) 2015 Microsoft Corporation. All rights reserved.
 //
 // This code is licensed under the MIT License (MIT).
 //
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 //
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef GSL_STRING_SPAN_H
 #define GSL_STRING_SPAN_H
 
 #include <gsl/assert>   // for Ensures, Expects
 #include <gsl/span_ext> // for operator!=, operator==, dynamic_extent
 #include <gsl/util>     // for narrow_cast
 
 #include <algorithm> // for equal, lexicographical_compare
 #include <array>     // for array
 #include <cstddef>   // for size_t, nullptr_t
 #include <cstdint>   // for PTRDIFF_MAX
 #include <cstring>
 #include <string>      // for basic_string, allocator, char_traits
 #include <type_traits> // for declval, is_convertible, enable_if_t, add_...
 
 #if defined(_MSC_VER) && !defined(__clang__)
 #pragma warning(push)
 
 // Turn MSVC /analyze rules that generate too much noise. TODO: fix in the tool.
 #pragma warning(disable : 26446) // TODO: bug in parser - attributes and templates
 #pragma warning(disable : 26481) // TODO: suppress does not work inside templates sometimes
 #pragma warning(disable : 4996)  // use of functions & classes marked [[deprecated]]
 #endif                           // _MSC_VER
 
 #if defined(__GNUC__) || defined(__clang__)
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 #endif
 
 namespace gsl
 {
 //
 // czstring and wzstring
 //
 // These are "tag" typedefs for C-style strings (i.e. null-terminated character arrays)
 // that allow static analysis to help find bugs.
 //
 // There are no additional features/semantics that we can find a way to add inside the
 // type system for these types that will not either incur significant runtime costs or
 // (sometimes needlessly) break existing programs when introduced.
 //
 
 template <typename CharT, std::size_t Extent = dynamic_extent>
 using basic_zstring = CharT*;
 
 using czstring = basic_zstring<const char, dynamic_extent>;
 
 using cwzstring = basic_zstring<const wchar_t, dynamic_extent>;
 
 using cu16zstring = basic_zstring<const char16_t, dynamic_extent>;
 
 using cu32zstring = basic_zstring<const char32_t, dynamic_extent>;
 
 using zstring = basic_zstring<char, dynamic_extent>;
 
 using wzstring = basic_zstring<wchar_t, dynamic_extent>;
 
 using u16zstring = basic_zstring<char16_t, dynamic_extent>;
 
 using u32zstring = basic_zstring<char32_t, dynamic_extent>;
 
 namespace details
 {
     template <class CharT>
     [[deprecated("string_span was removed from the C++ Core Guidelines. For more information, see "
                  "isocpp/CppCoreGuidelines PR#1680")]] constexpr std::size_t
     string_length(const CharT* str, std::size_t n)
     {
         if (str == nullptr || n == dynamic_extent) return 0;
 
         const span<const CharT> str_span{str, n};
 
         std::size_t len = 0;
         while (len < n && str_span[len]) len++;
 
         return len;
     }
 } // namespace details
 
 //
 // ensure_sentinel()
 //
 // Provides a way to obtain an span from a contiguous sequence
 // that ends with a (non-inclusive) sentinel value.
 //
 // Will fail-fast if sentinel cannot be found before max elements are examined.
 //
 template <typename T, const T Sentinel>
 [[deprecated("string_span was removed from the C++ Core Guidelines. For more information, see "
              "isocpp/CppCoreGuidelines PR#1680")]] constexpr span<T, dynamic_extent>
 ensure_sentinel(T* seq, std::size_t max = static_cast<std::size_t>(-1))
 {
     Ensures(seq != nullptr);
 
     // clang-format off
     GSL_SUPPRESS(f.23) // TODO: false positive // TODO: suppress does not work
     // clang-format on
     auto cur = seq;
     Ensures(cur != nullptr); // workaround for removing the warning
 
     // clang-format off
     GSL_SUPPRESS(bounds.1) // TODO: suppress does not work
     // clang-format on
     while (static_cast<std::size_t>(cur - seq) < max && *cur != Sentinel) ++cur;
     Ensures(*cur == Sentinel);
     return {seq, static_cast<std::size_t>(cur - seq)};
 }
 
 //
 // ensure_z - creates a span for a zero terminated strings. The span will not contain the zero
 // termination. Will fail fast if a null-terminator cannot be found before the limit of size_type.
 //
 template <typename CharT>
 [[deprecated("string_span was removed from the C++ Core Guidelines. For more information, see "
              "isocpp/CppCoreGuidelines PR#1680")]] constexpr span<CharT, dynamic_extent>
 ensure_z(CharT* const& sz, std::size_t max = static_cast<std::size_t>(-1))
 {
     return ensure_sentinel<CharT, CharT(0)>(sz, max);
 }
 
 template <typename CharT, std::size_t N>
 constexpr span<CharT, dynamic_extent> ensure_z(CharT (&sz)[N])
 {
     return ensure_z(&sz[0], N);
 }
 
 template <class Cont>
 [[deprecated(
     "string_span was removed from the C++ Core Guidelines. For more information, see "
     "isocpp/CppCoreGuidelines PR#1680")]] constexpr span<typename std::
                                                              remove_pointer<
                                                                  typename Cont::pointer>::type,
                                                          dynamic_extent>
 ensure_z(Cont& cont)
 {
     return ensure_z(cont.data(), cont.size());
 }
 
 template <typename CharT, std::size_t>
 class [[deprecated("string_span was removed from the C++ Core Guidelines. For more information, "
                    "see isocpp/CppCoreGuidelines PR#1680")]] basic_string_span;
 
 namespace details
 {
     template <typename T>
     struct [[deprecated(
         "string_span was removed from the C++ Core Guidelines. For more information, "
         "see isocpp/CppCoreGuidelines PR#1680")]] is_basic_string_span_oracle : std::false_type{};
 
     template <typename CharT, std::size_t Extent>
     struct [[deprecated(
         "string_span was removed from the C++ Core Guidelines. For more information, see "
         "isocpp/CppCoreGuidelines PR#1680")]] is_basic_string_span_oracle<basic_string_span<CharT,
                                                                                             Extent>>
         : std::true_type{};
 
     template <typename T>
     struct [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                         "information, see isocpp/CppCoreGuidelines PR#1680")]] is_basic_string_span
         : is_basic_string_span_oracle<std::remove_cv_t<T>>{};
 } // namespace details
 
 //
 // string_span and relatives
 //
 template <typename CharT, std::size_t Extent = dynamic_extent>
 class [[deprecated("string_span was removed from the C++ Core Guidelines. For more information, "
                    "see isocpp/CppCoreGuidelines PR#1680")]] basic_string_span
 {
 public:
     using element_type = CharT;
     using value_type = std::remove_cv_t<element_type>;
     using pointer = std::add_pointer_t<element_type>;
     using reference = std::add_lvalue_reference_t<element_type>;
     using const_reference = std::add_lvalue_reference_t<std::add_const_t<element_type>>;
     using impl_type = span<element_type, Extent>;
 
     using size_type = typename impl_type::size_type;
     using iterator = typename impl_type::iterator;
     using reverse_iterator = typename impl_type::reverse_iterator;
 
     // default (empty)
     constexpr basic_string_span() noexcept = default;
 
     // copy
     constexpr basic_string_span(const basic_string_span& other) noexcept = default;
 
     // assign
     constexpr basic_string_span& operator=(const basic_string_span& other) noexcept = default;
 
     constexpr basic_string_span(pointer ptr, size_type length) : span_(ptr, length) {}
     constexpr basic_string_span(pointer firstElem, pointer lastElem) : span_(firstElem, lastElem) {}
 
     // From static arrays - if 0-terminated, remove 0 from the view
     // All other containers allow 0s within the length, so we do not remove them
     template <std::size_t N>
     constexpr basic_string_span(element_type(&arr)[N]) : span_(remove_z(arr))
     {}
 
     template <std::size_t N, class ArrayElementType = std::remove_const_t<element_type>>
     constexpr basic_string_span(std::array<ArrayElementType, N> & arr) noexcept : span_(arr)
     {}
 
     template <std::size_t N, class ArrayElementType = std::remove_const_t<element_type>>
     constexpr basic_string_span(const std::array<ArrayElementType, N>& arr) noexcept : span_(arr)
     {}
 
     // Container signature should work for basic_string after C++17 version exists
     template <class Traits, class Allocator>
     // GSL_SUPPRESS(bounds.4) // TODO: parser bug
     constexpr basic_string_span(std::basic_string<element_type, Traits, Allocator> & str)
         : span_(&str[0], str.length())
     {}
 
     template <class Traits, class Allocator>
     constexpr basic_string_span(const std::basic_string<element_type, Traits, Allocator>& str)
         : span_(&str[0], str.length())
     {}
 
     // from containers. Containers must have a pointer type and data() function signatures
     template <class Container,
               class = std::enable_if_t<
                   !details::is_basic_string_span<Container>::value &&
                   std::is_convertible<typename Container::pointer, pointer>::value &&
                   std::is_convertible<typename Container::pointer,
                                       decltype(std::declval<Container>().data())>::value>>
     constexpr basic_string_span(Container & cont) : span_(cont)
     {}
 
     template <class Container,
               class = std::enable_if_t<
                   !details::is_basic_string_span<Container>::value &&
                   std::is_convertible<typename Container::pointer, pointer>::value &&
                   std::is_convertible<typename Container::pointer,
                                       decltype(std::declval<Container>().data())>::value>>
     constexpr basic_string_span(const Container& cont) : span_(cont)
     {}
 
     // from string_span
     template <
         class OtherValueType, std::size_t OtherExtent,
         class = std::enable_if_t<std::is_convertible<
             typename basic_string_span<OtherValueType, OtherExtent>::impl_type, impl_type>::value>>
     constexpr basic_string_span(basic_string_span<OtherValueType, OtherExtent> other)
         : span_(other.data(), other.length())
     {}
 
     template <size_type Count>
     constexpr basic_string_span<element_type, Count> first() const
     {
         return {span_.template first<Count>()};
     }
 
     constexpr basic_string_span<element_type, dynamic_extent> first(size_type count) const
     {
         return {span_.first(count)};
     }
 
     template <size_type Count>
     constexpr basic_string_span<element_type, Count> last() const
     {
         return {span_.template last<Count>()};
     }
 
     constexpr basic_string_span<element_type, dynamic_extent> last(size_type count) const
     {
         return {span_.last(count)};
     }
 
     template <size_type Offset, size_type Count>
     constexpr basic_string_span<element_type, Count> subspan() const
     {
         return {span_.template subspan<Offset, Count>()};
     }
 
     constexpr basic_string_span<element_type, dynamic_extent> subspan(
         size_type offset, size_type count = dynamic_extent) const
     {
         return {span_.subspan(offset, count)};
     }
 
     constexpr reference operator[](size_type idx) const { return span_[idx]; }
     constexpr reference operator()(size_type idx) const { return span_[idx]; }
 
     constexpr pointer data() const { return span_.data(); }
 
     constexpr size_type length() const noexcept { return span_.size(); }
     constexpr size_type size() const noexcept { return span_.size(); }
     constexpr size_type size_bytes() const noexcept { return span_.size_bytes(); }
     constexpr size_type length_bytes() const noexcept { return span_.length_bytes(); }
     constexpr bool empty() const noexcept { return size() == 0; }
 
     constexpr iterator begin() const noexcept { return span_.begin(); }
     constexpr iterator end() const noexcept { return span_.end(); }
 
     constexpr reverse_iterator rbegin() const noexcept { return span_.rbegin(); }
     constexpr reverse_iterator rend() const noexcept { return span_.rend(); }
 
 private:
     static constexpr impl_type remove_z(pointer const& sz, std::size_t max)
     {
         return impl_type(sz, details::string_length(sz, max));
     }
 
     template <std::size_t N>
     static constexpr impl_type remove_z(element_type(&sz)[N])
     {
         return remove_z(&sz[0], N);
     }
 
     impl_type span_;
 };
 
 template <std::size_t Extent = dynamic_extent>
 using string_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                                "information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_string_span<char, Extent>;
 
 template <std::size_t Extent = dynamic_extent>
 using cstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                                 "information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_string_span<const char, Extent>;
 
 template <std::size_t Extent = dynamic_extent>
 using wstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                                 "information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_string_span<wchar_t, Extent>;
 
 template <std::size_t Extent = dynamic_extent>
 using cwstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                                  "information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_string_span<const wchar_t, Extent>;
 
 template <std::size_t Extent = dynamic_extent>
 using u16string_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                                   "information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_string_span<char16_t, Extent>;
 
 template <std::size_t Extent = dynamic_extent>
 using cu16string_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                                    "information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_string_span<const char16_t, Extent>;
 
 template <std::size_t Extent = dynamic_extent>
 using u32string_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                                   "information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_string_span<char32_t, Extent>;
 
 template <std::size_t Extent = dynamic_extent>
 using cu32string_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                                    "information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_string_span<const char32_t, Extent>;
 
 //
 // to_string() allow (explicit) conversions from string_span to string
 //
 
 template <typename CharT, std::size_t Extent>
 constexpr std::basic_string<typename std::remove_const<CharT>::type>
 to_string(basic_string_span<CharT, Extent> view)
 {
     return {view.data(), narrow_cast<std::size_t>(view.length())};
 }
 
 template <typename CharT, typename Traits = typename std::char_traits<CharT>,
           typename Allocator = std::allocator<CharT>, typename gCharT, std::size_t Extent>
 constexpr std::basic_string<CharT, Traits, Allocator>
 to_basic_string(basic_string_span<gCharT, Extent> view)
 {
     return {view.data(), narrow_cast<std::size_t>(view.length())};
 }
 
 template <class ElementType, std::size_t Extent>
 constexpr basic_string_span<const byte, details::calculate_byte_size<ElementType, Extent>::value>
 as_bytes(basic_string_span<ElementType, Extent> s) noexcept
 {
     // clang-format off
     GSL_SUPPRESS(type.1)
     // clang-format on
     return {reinterpret_cast<const byte*>(s.data()), s.size_bytes()};
 }
 
 template <class ElementType, std::size_t Extent,
           class = std::enable_if_t<!std::is_const<ElementType>::value>>
 constexpr basic_string_span<byte, details::calculate_byte_size<ElementType, Extent>::value>
 as_writable_bytes(basic_string_span<ElementType, Extent> s) noexcept
 {
     // clang-format off
     GSL_SUPPRESS(type.1)
     // clang-format on
     return {reinterpret_cast<byte*>(s.data()), s.size_bytes()};
 }
 
 // zero-terminated string span, used to convert
 // zero-terminated spans to legacy strings
 template <typename CharT, std::size_t Extent = dynamic_extent>
 class [[deprecated("string_span was removed from the C++ Core Guidelines. For more information, "
                    "see isocpp/CppCoreGuidelines PR#1680")]] basic_zstring_span
 {
 public:
     using value_type = CharT;
     using const_value_type = std::add_const_t<CharT>;
 
     using pointer = std::add_pointer_t<value_type>;
     using const_pointer = std::add_pointer_t<const_value_type>;
 
     using zstring_type = basic_zstring<value_type, Extent>;
     using const_zstring_type = basic_zstring<const_value_type, Extent>;
 
     using impl_type = span<value_type, Extent>;
     using string_span_type = basic_string_span<value_type, Extent>;
 
     constexpr basic_zstring_span(impl_type s) : span_(s)
     {
         // expects a zero-terminated span
         Expects(s.size() > 0);
         Expects(s[s.size() - 1] == value_type{});
     }
 
     // copy
     constexpr basic_zstring_span(const basic_zstring_span& other) = default;
 
     // move
     constexpr basic_zstring_span(basic_zstring_span && other) = default;
 
     // assign
     constexpr basic_zstring_span& operator=(const basic_zstring_span& other) = default;
 
     // move assign
     constexpr basic_zstring_span& operator=(basic_zstring_span&& other) = default;
 
     constexpr bool empty() const noexcept { return false; }
 
     constexpr string_span_type as_string_span() const noexcept
     {
         return {span_.data(), span_.size() - 1};
     }
     constexpr string_span_type ensure_z() const { return gsl::ensure_z(span_); }
 
     constexpr const_zstring_type assume_z() const noexcept { return span_.data(); }
 
 private:
     impl_type span_;
 };
 
 template <std::size_t Max = dynamic_extent>
 using zstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                                 "information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_zstring_span<char, Max>;
 
 template <std::size_t Max = dynamic_extent>
 using wzstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                                  "information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_zstring_span<wchar_t, Max>;
 
 template <std::size_t Max = dynamic_extent>
 using u16zstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                                    "information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_zstring_span<char16_t, Max>;
 
 template <std::size_t Max = dynamic_extent>
 using u32zstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                                    "information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_zstring_span<char32_t, Max>;
 
 template <std::size_t Max = dynamic_extent>
 using czstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                                  "information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_zstring_span<const char, Max>;
 
 template <std::size_t Max = dynamic_extent>
 using cwzstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
                                   "information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_zstring_span<const wchar_t, Max>;
 
 template <std::size_t Max = dynamic_extent>
 using cu16zstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For "
                                     "more information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_zstring_span<const char16_t, Max>;
 
 template <std::size_t Max = dynamic_extent>
 using cu32zstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For "
                                     "more information, see isocpp/CppCoreGuidelines PR#1680")]] =
     basic_zstring_span<const char32_t, Max>;
 
 // operator ==
 template <class CharT, std::size_t Extent, class T,
           class = std::enable_if_t<
               details::is_basic_string_span<T>::value ||
               std::is_convertible<T, gsl::basic_string_span<std::add_const_t<CharT>>>::value>>
 bool operator==(const gsl::basic_string_span<CharT, Extent>& one, const T& other)
 {
     const gsl::basic_string_span<std::add_const_t<CharT>> tmp(other);
     return std::equal(one.begin(), one.end(), tmp.begin(), tmp.end());
 }
 
 template <class CharT, std::size_t Extent, class T,
           class = std::enable_if_t<
               !details::is_basic_string_span<T>::value &&
               std::is_convertible<T, gsl::basic_string_span<std::add_const_t<CharT>>>::value>>
 bool operator==(const T& one, const gsl::basic_string_span<CharT, Extent>& other)
 {
     const gsl::basic_string_span<std::add_const_t<CharT>> tmp(one);
     return std::equal(tmp.begin(), tmp.end(), other.begin(), other.end());
 }
 
 // operator !=
 template <typename CharT, std::size_t Extent = dynamic_extent, typename T,
           typename = std::enable_if_t<std::is_convertible<
               T, gsl::basic_string_span<std::add_const_t<CharT>, Extent>>::value>>
 bool operator!=(gsl::basic_string_span<CharT, Extent> one, const T& other)
 {
     return !(one == other);
 }
 
 template <
     typename CharT, std::size_t Extent = dynamic_extent, typename T,
     typename = std::enable_if_t<
         std::is_convertible<T, gsl::basic_string_span<std::add_const_t<CharT>, Extent>>::value &&
         !gsl::details::is_basic_string_span<T>::value>>
 bool operator!=(const T& one, gsl::basic_string_span<CharT, Extent> other)
 {
     return !(one == other);
 }
 
 // operator<
 template <typename CharT, std::size_t Extent = dynamic_extent, typename T,
           typename = std::enable_if_t<std::is_convertible<
               T, gsl::basic_string_span<std::add_const_t<CharT>, Extent>>::value>>
 bool operator<(gsl::basic_string_span<CharT, Extent> one, const T& other)
 {
     const gsl::basic_string_span<std::add_const_t<CharT>, Extent> tmp(other);
     return std::lexicographical_compare(one.begin(), one.end(), tmp.begin(), tmp.end());
 }
 
 template <
     typename CharT, std::size_t Extent = dynamic_extent, typename T,
     typename = std::enable_if_t<
         std::is_convertible<T, gsl::basic_string_span<std::add_const_t<CharT>, Extent>>::value &&
         !gsl::details::is_basic_string_span<T>::value>>
 bool operator<(const T& one, gsl::basic_string_span<CharT, Extent> other)
 {
     gsl::basic_string_span<std::add_const_t<CharT>, Extent> tmp(one);
     return std::lexicographical_compare(tmp.begin(), tmp.end(), other.begin(), other.end());
 }
 
 #ifndef _MSC_VER
 
 // VS treats temp and const containers as convertible to basic_string_span,
 // so the cases below are already covered by the previous operators
 
 template <
     typename CharT, std::size_t Extent = dynamic_extent, typename T,
     typename DataType = typename T::value_type,
     typename = std::enable_if_t<
         !gsl::details::is_span<T>::value && !gsl::details::is_basic_string_span<T>::value &&
         std::is_convertible<DataType*, CharT*>::value &&
         std::is_same<std::decay_t<decltype(std::declval<T>().size(), *std::declval<T>().data())>,
                      DataType>::value>>
 bool operator<(gsl::basic_string_span<CharT, Extent> one, const T& other)
 {
     gsl::basic_string_span<std::add_const_t<CharT>, Extent> tmp(other);
     return std::lexicographical_compare(one.begin(), one.end(), tmp.begin(), tmp.end());
 }
 
 template <
     typename CharT, std::size_t Extent = dynamic_extent, typename T,
     typename DataType = typename T::value_type,
     typename = std::enable_if_t<
         !gsl::details::is_span<T>::value && !gsl::details::is_basic_string_span<T>::value &&
         std::is_convertible<DataType*, CharT*>::value &&
         std::is_same<std::decay_t<decltype(std::declval<T>().size(), *std::declval<T>().data())>,
                      DataType>::value>>
 bool operator<(const T& one, gsl::basic_string_span<CharT, Extent> other)
 {
     gsl::basic_string_span<std::add_const_t<CharT>, Extent> tmp(one);
     return std::lexicographical_compare(tmp.begin(), tmp.end(), other.begin(), other.end());
 }
 #endif
 
 // operator <=
 template <typename CharT, std::size_t Extent = dynamic_extent, typename T,
           typename = std::enable_if_t<std::is_convertible<
               T, gsl::basic_string_span<std::add_const_t<CharT>, Extent>>::value>>
 bool operator<=(gsl::basic_string_span<CharT, Extent> one, const T& other)
 {
     return !(other < one);
 }
 
 template <
     typename CharT, std::size_t Extent = dynamic_extent, typename T,
     typename = std::enable_if_t<
         std::is_convertible<T, gsl::basic_string_span<std::add_const_t<CharT>, Extent>>::value &&
         !gsl::details::is_basic_string_span<T>::value>>
 bool operator<=(const T& one, gsl::basic_string_span<CharT, Extent> other)
 {
     return !(other < one);
 }
 
 #ifndef _MSC_VER
 
 // VS treats temp and const containers as convertible to basic_string_span,
 // so the cases below are already covered by the previous operators
 
 template <
     typename CharT, std::size_t Extent = dynamic_extent, typename T,
     typename DataType = typename T::value_type,
     typename = std::enable_if_t<
         !gsl::details::is_span<T>::value && !gsl::details::is_basic_string_span<T>::value &&
         std::is_convertible<DataType*, CharT*>::value &&
         std::is_same<std::decay_t<decltype(std::declval<T>().size(), *std::declval<T>().data())>,
                      DataType>::value>>
 bool operator<=(gsl::basic_string_span<CharT, Extent> one, const T& other)
 {
     return !(other < one);
 }
 
 template <
     typename CharT, std::size_t Extent = dynamic_extent, typename T,
     typename DataType = typename T::value_type,
     typename = std::enable_if_t<
         !gsl::details::is_span<T>::value && !gsl::details::is_basic_string_span<T>::value &&
         std::is_convertible<DataType*, CharT*>::value &&
         std::is_same<std::decay_t<decltype(std::declval<T>().size(), *std::declval<T>().data())>,
                      DataType>::value>>
 bool operator<=(const T& one, gsl::basic_string_span<CharT, Extent> other)
 {
     return !(other < one);
 }
 #endif
 
 // operator>
 template <typename CharT, std::size_t Extent = dynamic_extent, typename T,
           typename = std::enable_if_t<std::is_convertible<
               T, gsl::basic_string_span<std::add_const_t<CharT>, Extent>>::value>>
 bool operator>(gsl::basic_string_span<CharT, Extent> one, const T& other)
 {
     return other < one;
 }
 
 template <
     typename CharT, std::size_t Extent = dynamic_extent, typename T,
     typename = std::enable_if_t<
         std::is_convertible<T, gsl::basic_string_span<std::add_const_t<CharT>, Extent>>::value &&
         !gsl::details::is_basic_string_span<T>::value>>
 bool operator>(const T& one, gsl::basic_string_span<CharT, Extent> other)
 {
     return other < one;
 }
 
 #ifndef _MSC_VER
 
 // VS treats temp and const containers as convertible to basic_string_span,
 // so the cases below are already covered by the previous operators
 
 template <
     typename CharT, std::size_t Extent = dynamic_extent, typename T,
     typename DataType = typename T::value_type,
     typename = std::enable_if_t<
         !gsl::details::is_span<T>::value && !gsl::details::is_basic_string_span<T>::value &&
         std::is_convertible<DataType*, CharT*>::value &&
         std::is_same<std::decay_t<decltype(std::declval<T>().size(), *std::declval<T>().data())>,
                      DataType>::value>>
 bool operator>(gsl::basic_string_span<CharT, Extent> one, const T& other)
 {
     return other < one;
 }
 
 template <
     typename CharT, std::size_t Extent = dynamic_extent, typename T,
     typename DataType = typename T::value_type,
     typename = std::enable_if_t<
         !gsl::details::is_span<T>::value && !gsl::details::is_basic_string_span<T>::value &&
         std::is_convertible<DataType*, CharT*>::value &&
         std::is_same<std::decay_t<decltype(std::declval<T>().size(), *std::declval<T>().data())>,
                      DataType>::value>>
 bool operator>(const T& one, gsl::basic_string_span<CharT, Extent> other)
 {
     return other < one;
 }
 #endif
 
 // operator >=
 template <typename CharT, std::size_t Extent = dynamic_extent, typename T,
           typename = std::enable_if_t<std::is_convertible<
               T, gsl::basic_string_span<std::add_const_t<CharT>, Extent>>::value>>
 bool operator>=(gsl::basic_string_span<CharT, Extent> one, const T& other)
 {
     return !(one < other);
 }
 
 template <
     typename CharT, std::size_t Extent = dynamic_extent, typename T,
     typename = std::enable_if_t<
         std::is_convertible<T, gsl::basic_string_span<std::add_const_t<CharT>, Extent>>::value &&
         !gsl::details::is_basic_string_span<T>::value>>
 bool operator>=(const T& one, gsl::basic_string_span<CharT, Extent> other)
 {
     return !(one < other);
 }
 
 #ifndef _MSC_VER
 
 // VS treats temp and const containers as convertible to basic_string_span,
 // so the cases below are already covered by the previous operators
 
 template <
     typename CharT, std::size_t Extent = dynamic_extent, typename T,
     typename DataType = typename T::value_type,
     typename = std::enable_if_t<
         !gsl::details::is_span<T>::value && !gsl::details::is_basic_string_span<T>::value &&
         std::is_convertible<DataType*, CharT*>::value &&
         std::is_same<std::decay_t<decltype(std::declval<T>().size(), *std::declval<T>().data())>,
                      DataType>::value>>
 bool operator>=(gsl::basic_string_span<CharT, Extent> one, const T& other)
 {
     return !(one < other);
 }
 
 template <
     typename CharT, std::size_t Extent = dynamic_extent, typename T,
     typename DataType = typename T::value_type,
     typename = std::enable_if_t<
         !gsl::details::is_span<T>::value && !gsl::details::is_basic_string_span<T>::value &&
         std::is_convertible<DataType*, CharT*>::value &&
         std::is_same<std::decay_t<decltype(std::declval<T>().size(), *std::declval<T>().data())>,
                      DataType>::value>>
 bool operator>=(const T& one, gsl::basic_string_span<CharT, Extent> other)
 {
     return !(one < other);
 }
 #endif
 } // namespace gsl
 
 #if defined(_MSC_VER) && !defined(__clang__)
 #pragma warning(pop)
 
 #endif // _MSC_VER
 
 #if defined(__GNUC__) || defined(__clang__)
 #pragma GCC diagnostic pop
 #endif
 #endif // GSL_STRING_SPAN_H

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