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Diffstat (limited to 'gsl/string_span')
| -rw-r--r-- | gsl/string_span | 870 |
1 files changed, 870 insertions, 0 deletions
diff --git a/gsl/string_span b/gsl/string_span new file mode 100644 index 0000000..703bc01 --- /dev/null +++ b/gsl/string_span @@ -0,0 +1,870 @@ +/////////////////////////////////////////////////////////////////////////////// +// +// 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" +#include "gsl_util" +#include "span" +#include <cstdint> +#include <cstring> +#include <string> + +#ifdef _MSC_VER + +// No MSVC does constexpr fully yet +#pragma push_macro("constexpr") +#define constexpr /*constexpr*/ + +#pragma warning(push) + +// blanket turn off warnings from CppCoreCheck for now +// so people aren't annoyed by them when running the tool. +// more targeted suppressions will be added in a future update to the GSL +#pragma warning(disable : 26481 26482 26483 26485 26490 26491 26492 26493 26495) + +// 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 /*noexcept*/ +#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 /*noexcept*/ + +#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_extent> +using basic_zstring = CharT*; + +template <std::ptrdiff_t Extent = dynamic_extent> +using czstring = basic_zstring<const char, Extent>; + +template <std::ptrdiff_t Extent = dynamic_extent> +using cwzstring = basic_zstring<const wchar_t, Extent>; + +template <std::ptrdiff_t Extent = dynamic_extent> +using zstring = basic_zstring<char, Extent>; + +template <std::ptrdiff_t Extent = dynamic_extent> +using wzstring = basic_zstring<wchar_t, Extent>; + +namespace details +{ + inline std::ptrdiff_t string_length(const char *str, std::ptrdiff_t n) + { + if (str == nullptr || n <= 0) + return 0; + + span<const char> str_span{str, n}; + + std::ptrdiff_t len = 0; + while (len < n && str_span[len]) + len++; + + return len; + } + + inline std::ptrdiff_t wstring_length(const wchar_t *str, std::ptrdiff_t n) + { + if (str == nullptr || n <= 0) + return 0; + + span<const wchar_t> str_span{str, n}; + + std::ptrdiff_t len = 0; + while (len < n && str_span[len]) + len++; + + return len; + } +} + +// +// 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_extent> 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_extent> 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_extent> ensure_z(char* const& sz, std::ptrdiff_t max) +{ + auto len = details::string_length(sz, max); + Ensures(sz[len] == 0); + return {sz, len}; +} + +inline span<const char, dynamic_extent> ensure_z(const char* const& sz, std::ptrdiff_t max) +{ + auto len = details::string_length(sz, max); + Ensures(sz[len] == 0); + return {sz, len}; +} + +inline span<wchar_t, dynamic_extent> ensure_z(wchar_t* const& sz, std::ptrdiff_t max) +{ + auto len = details::wstring_length(sz, max); + Ensures(sz[len] == 0); + return {sz, len}; +} + +inline span<const wchar_t, dynamic_extent> ensure_z(const wchar_t* const& sz, std::ptrdiff_t max) +{ + auto len = details::wstring_length(sz, max); + Ensures(sz[len] == 0); + return {sz, len}; +} + +template <typename T, size_t N> +span<T, dynamic_extent> 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_extent> +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 details::string_length(ptr, length); + } + }; + + template <> + struct length_func<wchar_t> + { + std::ptrdiff_t operator()(wchar_t* const ptr, std::ptrdiff_t length) noexcept + { + return details::wstring_length(ptr, length); + } + }; + + template <> + struct length_func<const char> + { + std::ptrdiff_t operator()(const char* const ptr, std::ptrdiff_t length) noexcept + { + return details::string_length(ptr, length); + } + }; + + template <> + struct length_func<const wchar_t> + { + std::ptrdiff_t operator()(const wchar_t* const ptr, std::ptrdiff_t length) noexcept + { + return details::wstring_length(ptr, length); + } + }; +} + +// +// string_span and relatives +// +template <typename CharT, std::ptrdiff_t Extent = dynamic_extent> +class basic_string_span +{ +public: + using element_type = CharT; + 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 index_type = typename impl_type::index_type; + 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() noexcept = default; + + // copy + constexpr basic_string_span(const basic_string_span& other) noexcept = default; + +// move +#ifndef GSL_MSVC_NO_DEFAULT_MOVE_CTOR + constexpr basic_string_span(basic_string_span&& other) noexcept = 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) noexcept = default; + +// move assign +#ifndef GSL_MSVC_NO_DEFAULT_MOVE_CTOR + constexpr basic_string_span& operator=(basic_string_span&& other) noexcept = default; +#else + constexpr basic_string_span& operator=(basic_string_span&& other) noexcept + { + span_ = std::move(other.span_); + return *this; + } +#endif + + // from nullptr + constexpr basic_string_span(std::nullptr_t ptr) noexcept : span_(ptr) {} + + constexpr basic_string_span(pointer ptr, index_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 <size_t N> + constexpr basic_string_span(element_type (&arr)[N]) : span_(remove_z(arr)) + { + } + + template <size_t N, class ArrayElementType = std::remove_const_t<element_type>> + constexpr basic_string_span(std::array<ArrayElementType, N>& arr) noexcept : span_(arr) + { + } + + template <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> + 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::ptrdiff_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 <index_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(index_type count) const + { + return {span_.first(count)}; + } + + template <index_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(index_type count) const + { + return {span_.last(count)}; + } + + template <index_type Offset, index_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(index_type offset, index_type count = dynamic_extent) const + { + return {span_.subspan(offset, count)}; + } + + constexpr reference operator[](index_type idx) const { return span_[idx]; } + constexpr reference operator()(index_type idx) const { return span_[idx]; } + + constexpr pointer data() const { return span_.data(); } + + constexpr index_type length() const noexcept { return span_.size(); } + constexpr index_type size() const noexcept { return span_.size(); } + constexpr index_type size_bytes() const noexcept { return span_.size_bytes(); } + constexpr index_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 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) + { + return {sz, details::length_func<element_type>()(sz, max)}; + } + + template <size_t N> + static impl_type remove_z(element_type (&sz)[N]) + { + return remove_z(&sz[0], narrow_cast<std::ptrdiff_t>(N)); + } + + impl_type span_; +}; + +template <std::ptrdiff_t Extent = dynamic_extent> +using string_span = basic_string_span<char, Extent>; + +template <std::ptrdiff_t Extent = dynamic_extent> +using cstring_span = basic_string_span<const char, Extent>; + +template <std::ptrdiff_t Extent = dynamic_extent> +using wstring_span = basic_string_span<wchar_t, Extent>; + +template <std::ptrdiff_t Extent = dynamic_extent> +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, std::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 + +template <typename CharT, + typename Traits = typename std::char_traits<CharT>, + typename Allocator = std::allocator<CharT>, + typename gCharT, + std::ptrdiff_t Extent> +std::basic_string<CharT, Traits, Allocator> to_basic_string(basic_string_span<gCharT, Extent> view) +{ + return {view.data(), static_cast<size_t>(view.length())}; +} + +// zero-terminated string span, used to convert +// zero-terminated spans to legacy strings +template <typename CharT, std::ptrdiff_t Extent = dynamic_extent> +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 s) noexcept : span_(s) + { + // expects a zero-terminated span + Expects(s[s.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 + { + auto sz = span_.size(); + return span_.first(sz <= 0 ? 0 : sz - 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_extent> +using zstring_span = basic_zstring_span<char, Max>; + +template <std::ptrdiff_t Max = dynamic_extent> +using wzstring_span = basic_zstring_span<wchar_t, Max>; + +template <std::ptrdiff_t Max = dynamic_extent> +using czstring_span = basic_zstring_span<const char, Max>; + +template <std::ptrdiff_t Max = dynamic_extent> +using cwzstring_span = basic_zstring_span<const wchar_t, Max>; + +// operator == +template <class CharT, std::ptrdiff_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) noexcept +{ + gsl::basic_string_span<std::add_const_t<CharT>> 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 <class CharT, std::ptrdiff_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) noexcept +{ + gsl::basic_string_span<std::add_const_t<CharT>> 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 +} + +// operator != +template <typename CharT, std::ptrdiff_t Extent = gsl::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) noexcept +{ + return !(one == other); +} + +template < + typename CharT, std::ptrdiff_t Extent = gsl::dynamic_extent, 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); +} + +// operator< +template <typename CharT, std::ptrdiff_t Extent = gsl::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) 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_extent, 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_extent, 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_extent, 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_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) noexcept +{ + return !(other < one); +} + +template < + typename CharT, std::ptrdiff_t Extent = gsl::dynamic_extent, 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_extent, 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_extent, 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_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) noexcept +{ + return other < one; +} + +template < + typename CharT, std::ptrdiff_t Extent = gsl::dynamic_extent, 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_extent, 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_extent, 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_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) noexcept +{ + return !(one < other); +} + +template < + typename CharT, std::ptrdiff_t Extent = gsl::dynamic_extent, 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_extent, 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_extent, 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 +} // namespace GSL + +#ifdef _MSC_VER + +#pragma warning(pop) + +#undef constexpr +#pragma pop_macro("constexpr") + +// VS 2013 workarounds +#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 |