/////////////////////////////////////////////////////////////////////////////// // // 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. // /////////////////////////////////////////////////////////////////////////////// #pragma once #ifndef GSL_STRING_SPAN_H #define GSL_STRING_SPAN_H #include "gsl_assert.h" #include "gsl_util.h" #include "span.h" #include <cstring> #include <string> #ifdef _MSC_VER // No MSVC does constexpr fully yet #pragma push_macro("constexpr") #define constexpr /* nothing */ // VS 2013 workarounds #if _MSC_VER <= 1800 #define GSL_MSVC_HAS_TYPE_DEDUCTION_BUG #define GSL_MSVC_HAS_SFINAE_SUBSTITUTION_ICE #define GSL_MSVC_NO_CPP14_STD_EQUAL #define GSL_MSVC_NO_DEFAULT_MOVE_CTOR // noexcept is not understood #ifndef GSL_THROW_ON_CONTRACT_VIOLATION #pragma push_macro("noexcept") #define noexcept /* nothing */ #endif #endif // _MSC_VER <= 1800 #endif // _MSC_VER // In order to test the library, we need it to throw exceptions that we can catch #ifdef GSL_THROW_ON_CONTRACT_VIOLATION #ifdef _MSC_VER #pragma push_macro("noexcept") #endif #define noexcept /* nothing */ #endif // GSL_THROW_ON_CONTRACT_VIOLATION namespace gsl { // // czstring and wzstring // // These are "tag" typedef's 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::ptrdiff_t Extent = dynamic_range> using basic_zstring = CharT*; template<std::ptrdiff_t Extent = dynamic_range> using czstring = basic_zstring<const char, Extent>; template<std::ptrdiff_t Extent = dynamic_range> using cwzstring = basic_zstring<const wchar_t, Extent>; template<std::ptrdiff_t Extent = dynamic_range> using zstring = basic_zstring<char, Extent>; template<std::ptrdiff_t Extent = dynamic_range> using wzstring = basic_zstring<wchar_t, Extent>; // // 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> span<T, dynamic_range> ensure_sentinel(T* seq, std::ptrdiff_t max = PTRDIFF_MAX) { auto cur = seq; while ((cur - seq) < max && *cur != Sentinel) ++cur; Ensures(*cur == Sentinel); return{ seq, cur - seq }; } // // ensure_z - creates a span for a czstring or cwzstring. // Will fail fast if a null-terminator cannot be found before // the limit of size_type. // template<typename T> inline span<T, dynamic_range> ensure_z(T* const & sz, std::ptrdiff_t max = PTRDIFF_MAX) { return ensure_sentinel<T, 0>(sz, max); } // TODO (neilmac) there is probably a better template-magic way to get the const and non-const overloads to share an implementation inline span<char, dynamic_range> ensure_z(char* const& sz, std::ptrdiff_t max) { auto len = strnlen(sz, narrow_cast<size_t>(max)); Ensures(sz[len] == 0); return{ sz, static_cast<std::ptrdiff_t>(len) }; } inline span<const char, dynamic_range> ensure_z(const char* const& sz, std::ptrdiff_t max) { auto len = strnlen(sz, narrow_cast<size_t>(max)); Ensures(sz[len] == 0); return{ sz, static_cast<std::ptrdiff_t>(len) }; } inline span<wchar_t, dynamic_range> ensure_z(wchar_t* const& sz, std::ptrdiff_t max) { auto len = wcsnlen(sz, narrow_cast<size_t>(max)); Ensures(sz[len] == 0); return{ sz, static_cast<std::ptrdiff_t>(len) }; } inline span<const wchar_t, dynamic_range> ensure_z(const wchar_t* const& sz, std::ptrdiff_t max) { auto len = wcsnlen(sz, narrow_cast<size_t>(max)); Ensures(sz[len] == 0); return{ sz, static_cast<std::ptrdiff_t>(len) }; } template<typename T, size_t N> span<T, dynamic_range> ensure_z(T(&sz)[N]) { return ensure_z(&sz[0], static_cast<std::ptrdiff_t>(N)); } template<class Cont> span<typename std::remove_pointer<typename Cont::pointer>::type, dynamic_range> ensure_z(Cont& cont) { return ensure_z(cont.data(), static_cast<std::ptrdiff_t>(cont.length())); } template<typename CharT, std::ptrdiff_t> class basic_string_span; namespace details { template <typename T> struct is_basic_string_span_oracle : std::false_type {}; template <typename CharT, std::ptrdiff_t Extent> struct is_basic_string_span_oracle<basic_string_span<CharT, Extent>> : std::true_type {}; template <typename T> struct is_basic_string_span : is_basic_string_span_oracle<std::remove_cv_t<T>> {}; template <typename T> struct length_func {}; template <> struct length_func<char> { std::ptrdiff_t operator()(char* const ptr, std::ptrdiff_t length) noexcept { return narrow_cast<std::ptrdiff_t>(strnlen(ptr, narrow_cast<size_t>(length))); } }; template <> struct length_func<wchar_t> { std::ptrdiff_t operator()(wchar_t* const ptr, std::ptrdiff_t length) noexcept { return narrow_cast<std::ptrdiff_t>(wcsnlen(ptr, narrow_cast<size_t>(length))); } }; template <> struct length_func<const char> { std::ptrdiff_t operator()(const char* const ptr, std::ptrdiff_t length) noexcept { return narrow_cast<std::ptrdiff_t>(strnlen(ptr, narrow_cast<size_t>(length))); } }; template <> struct length_func<const wchar_t> { std::ptrdiff_t operator()(const wchar_t* const ptr, std::ptrdiff_t length) noexcept { return narrow_cast<std::ptrdiff_t>(wcsnlen(ptr, narrow_cast<size_t>(length))); } }; } // // string_span and relatives // // Note that Extent is always single-dimension only // template <typename CharT, std::ptrdiff_t Extent = dynamic_range> class basic_string_span { public: using value_type = CharT; using const_value_type = std::add_const_t<value_type>; using pointer = std::add_pointer_t<value_type>; using reference = std::add_lvalue_reference_t<value_type>; using const_reference = std::add_lvalue_reference_t<const_value_type>; using bounds_type = static_bounds<Extent>; using impl_type = span<value_type, Extent>; using size_type = ptrdiff_t; using iterator = typename impl_type::iterator; using const_iterator = typename impl_type::const_iterator; using reverse_iterator = typename impl_type::reverse_iterator; using const_reverse_iterator = typename impl_type::const_reverse_iterator; // default (empty) constexpr basic_string_span() = default; // copy constexpr basic_string_span(const basic_string_span& other) = default; // move #ifndef GSL_MSVC_NO_DEFAULT_MOVE_CTOR constexpr basic_string_span(basic_string_span&& other) = default; #else constexpr basic_string_span(basic_string_span&& other) : span_(std::move(other.span_)) {} #endif // assign constexpr basic_string_span& operator=(const basic_string_span& other) = default; // move assign #ifndef GSL_MSVC_NO_DEFAULT_MOVE_CTOR constexpr basic_string_span& operator=(basic_string_span&& other) = default; #else constexpr basic_string_span& operator=(basic_string_span&& other) { span_ = std::move(other.span_); return *this; } #endif // from nullptr constexpr basic_string_span(std::nullptr_t ptr) noexcept : span_(ptr) {} // from nullptr and length constexpr basic_string_span(std::nullptr_t ptr, size_type length) noexcept : span_(ptr, length) {} // From static arrays - if 0-terminated, remove 0 from the view // from static arrays and string literals template<size_t N> constexpr basic_string_span(value_type(&arr)[N]) noexcept : span_(remove_z(arr)) {} // Those allow 0s within the length, so we do not remove them // from raw data and length constexpr basic_string_span(pointer ptr, size_type length) noexcept : span_(ptr, length) {} // from string constexpr basic_string_span(std::string& s) noexcept : span_(const_cast<pointer>(s.data()), narrow_cast<std::ptrdiff_t>(s.length())) {} // from containers. Containers must have .size() and .data() function signatures template <typename Cont, typename DataType = typename Cont::value_type, typename Dummy = std::enable_if_t<!details::is_span<Cont>::value && !details::is_basic_string_span<Cont>::value && !(!std::is_const<value_type>::value && std::is_const<Cont>::value) // no converting const containers to non-const span && std::is_convertible<DataType*, value_type*>::value && std::is_same<std::decay_t<decltype(std::declval<Cont>().size(), *std::declval<Cont>().data())>, DataType>::value> > constexpr basic_string_span(Cont& cont) : span_(cont.data(), cont.size()) {} // disallow creation from temporary containers and strings template <typename Cont, typename DataType = typename Cont::value_type, typename Dummy = std::enable_if_t<!details::is_span<Cont>::value && !details::is_basic_string_span<Cont>::value && std::is_convertible<DataType*, value_type*>::value && std::is_same<std::decay_t<decltype(std::declval<Cont>().size(), *std::declval<Cont>().data())>, DataType>::value> > basic_string_span(Cont&& cont) = delete; #ifndef GSL_MSVC_HAS_SFINAE_SUBSTITUTION_ICE // from span template <typename OtherValueType, std::ptrdiff_t OtherExtent, typename Dummy = std::enable_if_t< std::is_convertible<OtherValueType*, value_type*>::value && std::is_convertible<static_bounds<OtherExtent>, bounds_type>::value> > constexpr basic_string_span(span<OtherValueType, OtherExtent> other) noexcept : span_(other) {} #else // from span constexpr basic_string_span(span<value_type, Extent> other) noexcept : span_(other) {} template <typename Dummy = std::enable_if_t<!std::is_same<std::remove_const_t<value_type>, value_type>::value>> constexpr basic_string_span(span<std::remove_const_t<value_type>, Extent> other) noexcept : span_(other) {} #endif // from string_span template <typename OtherValueType, std::ptrdiff_t OtherExtent, typename OtherBounds = static_bounds<OtherExtent>, typename Dummy = std::enable_if_t<std::is_convertible<OtherValueType*, value_type*>::value && std::is_convertible<OtherBounds, bounds_type>::value> > constexpr basic_string_span(basic_string_span<OtherValueType, OtherExtent> other) noexcept : span_(other.data(), other.length()) {} constexpr bool empty() const noexcept { return length() == 0; } // first Count elements template<size_type Count> constexpr basic_string_span<value_type, Count> first() const noexcept { return{ span_.template first<Count>() }; } constexpr basic_string_span<value_type, dynamic_range> first(size_type count) const noexcept { return{ span_.first(count) }; } // last Count elements template<size_type Count> constexpr basic_string_span<value_type, Count> last() const noexcept { return{ span_.template last<Count>() }; } constexpr basic_string_span<value_type, dynamic_range> last(size_type count) const noexcept { return{ span_.last(count) }; } // create a subview of Count elements starting from Offset template<size_type Offset, size_type Count> constexpr basic_string_span<value_type, Count> subspan() const noexcept { return{ span_.template subspan<Offset, Count>() }; } constexpr basic_string_span<value_type, dynamic_range> subspan(size_type offset, size_type count = dynamic_range) const noexcept { return{ span_.subspan(offset, count) }; } constexpr reference operator[](size_type idx) const noexcept { return span_[idx]; } constexpr pointer data() const noexcept { return span_.data(); } // length of the span in elements constexpr size_type length() const noexcept { return span_.size(); } // length of the span in elements constexpr size_type size() const noexcept { return span_.size(); } // length of the span in bytes constexpr size_type size_bytes() const noexcept { return span_.size_bytes(); } // length of the span in bytes constexpr size_type length_bytes() const noexcept { return span_.length_bytes(); } constexpr iterator begin() const noexcept { return span_.begin(); } constexpr iterator end() const noexcept { return span_.end(); } constexpr const_iterator cbegin() const noexcept { return span_.cbegin(); } constexpr const_iterator cend() const noexcept { return span_.cend(); } constexpr reverse_iterator rbegin() const noexcept { return span_.rbegin(); } constexpr reverse_iterator rend() const noexcept { return span_.rend(); } constexpr const_reverse_iterator crbegin() const noexcept { return span_.crbegin(); } constexpr const_reverse_iterator crend() const noexcept { return span_.crend(); } private: static impl_type remove_z(pointer const& sz, std::ptrdiff_t max) noexcept { return{ sz, details::length_func<value_type>()(sz, max)}; } template<size_t N> static impl_type remove_z(value_type(&sz)[N]) noexcept { return remove_z(&sz[0], narrow_cast<std::ptrdiff_t>(N)); } impl_type span_; }; template<std::ptrdiff_t Extent = dynamic_range> using string_span = basic_string_span<char, Extent>; template<std::ptrdiff_t Extent = dynamic_range> using cstring_span = basic_string_span<const char, Extent>; template<std::ptrdiff_t Extent = dynamic_range> using wstring_span = basic_string_span<wchar_t, Extent>; template<std::ptrdiff_t Extent = dynamic_range> using cwstring_span = basic_string_span<const wchar_t, Extent>; // // to_string() allow (explicit) conversions from string_span to string // #ifndef GSL_MSVC_HAS_TYPE_DEDUCTION_BUG template<typename CharT, ptrdiff_t Extent> std::basic_string<typename std::remove_const<CharT>::type> to_string(basic_string_span<CharT, Extent> view) { return{ view.data(), static_cast<size_t>(view.length()) }; } #else inline std::string to_string(cstring_span<> view) { return{ view.data(), static_cast<size_t>(view.length()) }; } inline std::string to_string(string_span<> view) { return{ view.data(), static_cast<size_t>(view.length()) }; } inline std::wstring to_string(cwstring_span<> view) { return{ view.data(), static_cast<size_t>(view.length()) }; } inline std::wstring to_string(wstring_span<> view) { return{ view.data(), static_cast<size_t>(view.length()) }; } #endif // zero-terminated string span, used to convert // zero-terminated spans to legacy strings template<typename CharT, std::ptrdiff_t Extent = dynamic_range> class 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 span) noexcept : span_(span) { // expects a zero-terminated span Expects(span[span.size() - 1] == '\0'); } // copy constexpr basic_zstring_span(const basic_zstring_span& other) = default; // move #ifndef GSL_MSVC_NO_DEFAULT_MOVE_CTOR constexpr basic_zstring_span(basic_zstring_span&& other) = default; #else constexpr basic_zstring_span(basic_zstring_span&& other) : span_(std::move(other.span_)) {} #endif // assign constexpr basic_zstring_span& operator=(const basic_zstring_span& other) = default; // move assign #ifndef GSL_MSVC_NO_DEFAULT_MOVE_CTOR constexpr basic_zstring_span& operator=(basic_zstring_span&& other) = default; #else constexpr basic_zstring_span& operator=(basic_zstring_span&& other) { span_ = std::move(other.span_); return *this; } #endif constexpr bool empty() const noexcept { return span_.size() == 0; } constexpr string_span_type as_string_span() const noexcept { return span_.first(span_.size()-1); } constexpr string_span_type ensure_z() const noexcept { return gsl::ensure_z(span_); } constexpr const_zstring_type assume_z() const noexcept { return span_.data(); } private: impl_type span_; }; template <std::ptrdiff_t Max = dynamic_range> using zstring_span = basic_zstring_span<char, Max>; template <std::ptrdiff_t Max = dynamic_range> using wzstring_span = basic_zstring_span<wchar_t, Max>; template <std::ptrdiff_t Max = dynamic_range> using czstring_span = basic_zstring_span<const char, Max>; template <std::ptrdiff_t Max = dynamic_range> using cwzstring_span = basic_zstring_span<const wchar_t, Max>; } // namespace GSL // operator == template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, 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) noexcept { gsl::basic_string_span<std::add_const_t<CharT>, Extent> tmp(other); #ifdef GSL_MSVC_NO_CPP14_STD_EQUAL return (one.size() == tmp.size()) && std::equal(one.begin(), one.end(), tmp.begin()); #else return std::equal(one.begin(), one.end(), tmp.begin(), tmp.end()); #endif } template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename Dummy = 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) noexcept { gsl::basic_string_span<std::add_const_t<CharT>, Extent> tmp(one); #ifdef GSL_MSVC_NO_CPP14_STD_EQUAL return (tmp.size() == other.size()) && std::equal(tmp.begin(), tmp.end(), other.begin()); #else return std::equal(tmp.begin(), tmp.end(), other.begin(), other.end()); #endif } #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::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename DataType = typename T::value_type, typename Dummy = 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) noexcept { gsl::basic_string_span<std::add_const_t<CharT>, Extent> tmp(other); return std::equal(one.begin(), one.end(), tmp.begin(), tmp.end()); } template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename DataType = typename T::value_type, typename Dummy = 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) noexcept { gsl::basic_string_span<std::add_const_t<CharT>, Extent> tmp(one); return std::equal(tmp.begin(), tmp.end(), other.begin(), other.end()); } #endif // operator != template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, 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) noexcept { return !(one == other); } template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename Dummy = 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) noexcept { 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::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename DataType = typename T::value_type, typename Dummy = 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) noexcept { return !(one == other); } template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename DataType = typename T::value_type, typename Dummy = 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) noexcept { return !(one == other); } #endif // operator< template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, 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) noexcept { 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::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename Dummy = 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) noexcept { 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::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename DataType = typename T::value_type, typename Dummy = 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) noexcept { 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::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename DataType = typename T::value_type, typename Dummy = 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) noexcept { 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::ptrdiff_t Extent = gsl::dynamic_range, 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) noexcept { return !(other < one); } template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename Dummy = 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) noexcept { 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::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename DataType = typename T::value_type, typename Dummy = 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) noexcept { return !(other < one); } template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename DataType = typename T::value_type, typename Dummy = 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) noexcept { return !(other < one); } #endif // operator> template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, 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) noexcept { return other < one; } template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename Dummy = 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) noexcept { 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::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename DataType = typename T::value_type, typename Dummy = 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) noexcept { return other < one; } template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename DataType = typename T::value_type, typename Dummy = 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) noexcept { return other < one; } #endif // operator >= template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, 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) noexcept { return !(one < other); } template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename Dummy = 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) noexcept { 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::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename DataType = typename T::value_type, typename Dummy = 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) noexcept { return !(one < other); } template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_range, typename T, typename DataType = typename T::value_type, typename Dummy = 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) noexcept { return !(one < other); } #endif // VS 2013 workarounds #ifdef _MSC_VER #undef constexpr #pragma pop_macro("constexpr") #if _MSC_VER <= 1800 #ifndef GSL_THROW_ON_CONTRACT_VIOLATION #undef noexcept #pragma pop_macro("noexcept") #endif // GSL_THROW_ON_CONTRACT_VIOLATION #undef GSL_MSVC_HAS_TYPE_DEDUCTION_BUG #undef GSL_MSVC_HAS_SFINAE_SUBSTITUTION_ICE #undef GSL_MSVC_NO_CPP14_STD_EQUAL #undef GSL_MSVC_NO_DEFAULT_MOVE_CTOR #endif // _MSC_VER <= 1800 #endif // _MSC_VER #if defined(GSL_THROW_ON_CONTRACT_VIOLATION) #undef noexcept #ifdef _MSC_VER #pragma pop_macro("noexcept") #endif #endif // GSL_THROW_ON_CONTRACT_VIOLATION #endif // GSL_STRING_SPAN_H