mirror of
https://github.com/microsoft/GSL.git
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864 lines
29 KiB
Plaintext
864 lines
29 KiB
Plaintext
///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
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//
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// This code is licensed under the MIT License (MIT).
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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///////////////////////////////////////////////////////////////////////////////
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#pragma once
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#ifndef GSL_STRING_SPAN_H
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#define GSL_STRING_SPAN_H
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#include "gsl_assert"
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#include "gsl_util"
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#include "span"
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#include <cstdint>
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#include <cstring>
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#include <string>
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#ifdef _MSC_VER
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// No MSVC does constexpr fully yet
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#pragma push_macro("constexpr")
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#define constexpr /*constexpr*/
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#pragma warning(push)
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// blanket turn off warnings from CppCoreCheck for now
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// so people aren't annoyed by them when running the tool.
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// more targeted suppressions will be added in a future update to the GSL
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#pragma warning(disable : 26481 26482 26483 26485 26490 26491 26492 26493 26495)
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// VS 2013 workarounds
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#if _MSC_VER <= 1800
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#define GSL_MSVC_HAS_TYPE_DEDUCTION_BUG
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#define GSL_MSVC_HAS_SFINAE_SUBSTITUTION_ICE
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#define GSL_MSVC_NO_CPP14_STD_EQUAL
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#define GSL_MSVC_NO_DEFAULT_MOVE_CTOR
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// noexcept is not understood
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#ifndef GSL_THROW_ON_CONTRACT_VIOLATION
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#pragma push_macro("noexcept")
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#define noexcept /*noexcept*/
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#endif
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#endif // _MSC_VER <= 1800
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#endif // _MSC_VER
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#ifndef __CYGWIN__
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#define GSL_PLATFORM_HAS_STRNLEN
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#endif
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// In order to test the library, we need it to throw exceptions that we can catch
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#ifdef GSL_THROW_ON_CONTRACT_VIOLATION
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#ifdef _MSC_VER
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#pragma push_macro("noexcept")
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#endif
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#define noexcept /*noexcept*/
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#endif // GSL_THROW_ON_CONTRACT_VIOLATION
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namespace gsl
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{
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//
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// czstring and wzstring
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//
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// These are "tag" typedef's for C-style strings (i.e. null-terminated character arrays)
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// that allow static analysis to help find bugs.
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//
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// There are no additional features/semantics that we can find a way to add inside the
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// type system for these types that will not either incur significant runtime costs or
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// (sometimes needlessly) break existing programs when introduced.
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//
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template <typename CharT, std::ptrdiff_t Extent = dynamic_extent>
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using basic_zstring = CharT*;
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template <std::ptrdiff_t Extent = dynamic_extent>
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using czstring = basic_zstring<const char, Extent>;
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template <std::ptrdiff_t Extent = dynamic_extent>
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using cwzstring = basic_zstring<const wchar_t, Extent>;
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template <std::ptrdiff_t Extent = dynamic_extent>
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using zstring = basic_zstring<char, Extent>;
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template <std::ptrdiff_t Extent = dynamic_extent>
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using wzstring = basic_zstring<wchar_t, Extent>;
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namespace details
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{
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inline std::size_t string_length(const char *str, std::size_t n)
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{
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#ifdef GSL_PLATFORM_HAS_STRNLEN
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return strnlen(str, n);
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#else
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if (str == nullptr || n == 0)
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return 0;
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std::size_t len = 0;
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span<const char> str_span{str, n};
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while (len < n && str_span[len])
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len++;
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return len;
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#endif
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}
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}
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//
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// ensure_sentinel()
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//
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// Provides a way to obtain an span from a contiguous sequence
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// that ends with a (non-inclusive) sentinel value.
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//
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// Will fail-fast if sentinel cannot be found before max elements are examined.
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//
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template <typename T, const T Sentinel>
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span<T, dynamic_extent> ensure_sentinel(T* seq, std::ptrdiff_t max = PTRDIFF_MAX)
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{
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auto cur = seq;
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while ((cur - seq) < max && *cur != Sentinel) ++cur;
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Ensures(*cur == Sentinel);
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return {seq, cur - seq};
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}
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//
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// ensure_z - creates a span for a czstring or cwzstring.
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// Will fail fast if a null-terminator cannot be found before
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// the limit of size_type.
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//
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template <typename T>
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inline span<T, dynamic_extent> ensure_z(T* const& sz, std::ptrdiff_t max = PTRDIFF_MAX)
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{
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return ensure_sentinel<T, 0>(sz, max);
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}
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// TODO (neilmac) there is probably a better template-magic way to get the const and non-const
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// overloads to share an implementation
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inline span<char, dynamic_extent> ensure_z(char* const& sz, std::ptrdiff_t max)
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{
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auto len = details::string_length(sz, narrow_cast<size_t>(max));
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Ensures(sz[len] == 0);
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return {sz, static_cast<std::ptrdiff_t>(len)};
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}
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inline span<const char, dynamic_extent> ensure_z(const char* const& sz, std::ptrdiff_t max)
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{
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auto len = details::string_length(sz, narrow_cast<size_t>(max));
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Ensures(sz[len] == 0);
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return {sz, static_cast<std::ptrdiff_t>(len)};
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}
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inline span<wchar_t, dynamic_extent> ensure_z(wchar_t* const& sz, std::ptrdiff_t max)
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{
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auto len = wcsnlen(sz, narrow_cast<size_t>(max));
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Ensures(sz[len] == 0);
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return {sz, static_cast<std::ptrdiff_t>(len)};
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}
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inline span<const wchar_t, dynamic_extent> ensure_z(const wchar_t* const& sz, std::ptrdiff_t max)
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{
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auto len = wcsnlen(sz, narrow_cast<size_t>(max));
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Ensures(sz[len] == 0);
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return {sz, static_cast<std::ptrdiff_t>(len)};
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}
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template <typename T, size_t N>
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span<T, dynamic_extent> ensure_z(T (&sz)[N])
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{
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return ensure_z(&sz[0], static_cast<std::ptrdiff_t>(N));
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}
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template <class Cont>
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span<typename std::remove_pointer<typename Cont::pointer>::type, dynamic_extent>
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ensure_z(Cont& cont)
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{
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return ensure_z(cont.data(), static_cast<std::ptrdiff_t>(cont.length()));
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}
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template <typename CharT, std::ptrdiff_t>
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class basic_string_span;
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namespace details
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{
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template <typename T>
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struct is_basic_string_span_oracle : std::false_type
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{
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};
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template <typename CharT, std::ptrdiff_t Extent>
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struct is_basic_string_span_oracle<basic_string_span<CharT, Extent>> : std::true_type
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{
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};
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template <typename T>
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struct is_basic_string_span : is_basic_string_span_oracle<std::remove_cv_t<T>>
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{
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};
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template <typename T>
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struct length_func
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{
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};
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template <>
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struct length_func<char>
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{
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std::ptrdiff_t operator()(char* const ptr, std::ptrdiff_t length) noexcept
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{
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return narrow_cast<std::ptrdiff_t>(details::string_length(ptr, narrow_cast<size_t>(length)));
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}
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};
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template <>
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struct length_func<wchar_t>
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{
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std::ptrdiff_t operator()(wchar_t* const ptr, std::ptrdiff_t length) noexcept
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{
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return narrow_cast<std::ptrdiff_t>(wcsnlen(ptr, narrow_cast<size_t>(length)));
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}
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};
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template <>
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struct length_func<const char>
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{
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std::ptrdiff_t operator()(const char* const ptr, std::ptrdiff_t length) noexcept
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{
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return narrow_cast<std::ptrdiff_t>(details::string_length(ptr, narrow_cast<size_t>(length)));
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}
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};
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template <>
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struct length_func<const wchar_t>
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{
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std::ptrdiff_t operator()(const wchar_t* const ptr, std::ptrdiff_t length) noexcept
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{
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return narrow_cast<std::ptrdiff_t>(wcsnlen(ptr, narrow_cast<size_t>(length)));
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}
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};
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}
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//
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// string_span and relatives
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//
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template <typename CharT, std::ptrdiff_t Extent = dynamic_extent>
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class basic_string_span
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{
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public:
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using element_type = CharT;
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using pointer = std::add_pointer_t<element_type>;
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using reference = std::add_lvalue_reference_t<element_type>;
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using const_reference = std::add_lvalue_reference_t<std::add_const_t<element_type>>;
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using impl_type = span<element_type, Extent>;
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using index_type = typename impl_type::index_type;
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using iterator = typename impl_type::iterator;
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using const_iterator = typename impl_type::const_iterator;
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using reverse_iterator = typename impl_type::reverse_iterator;
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using const_reverse_iterator = typename impl_type::const_reverse_iterator;
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// default (empty)
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constexpr basic_string_span() noexcept = default;
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// copy
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constexpr basic_string_span(const basic_string_span& other) noexcept = default;
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// move
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#ifndef GSL_MSVC_NO_DEFAULT_MOVE_CTOR
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constexpr basic_string_span(basic_string_span&& other) noexcept = default;
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#else
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constexpr basic_string_span(basic_string_span&& other) : span_(std::move(other.span_)) {}
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#endif
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// assign
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constexpr basic_string_span& operator=(const basic_string_span& other) noexcept = default;
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// move assign
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#ifndef GSL_MSVC_NO_DEFAULT_MOVE_CTOR
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constexpr basic_string_span& operator=(basic_string_span&& other) noexcept = default;
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#else
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constexpr basic_string_span& operator=(basic_string_span&& other) noexcept
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{
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span_ = std::move(other.span_);
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return *this;
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}
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#endif
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// from nullptr
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constexpr basic_string_span(std::nullptr_t ptr) noexcept : span_(ptr) {}
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constexpr basic_string_span(pointer ptr, index_type length) : span_(ptr, length) {}
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constexpr basic_string_span(pointer firstElem, pointer lastElem) : span_(firstElem, lastElem) {}
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// From static arrays - if 0-terminated, remove 0 from the view
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// All other containers allow 0s within the length, so we do not remove them
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template <size_t N>
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constexpr basic_string_span(element_type (&arr)[N]) : span_(remove_z(arr))
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{
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}
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template <size_t N, class ArrayElementType = std::remove_const_t<element_type>>
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constexpr basic_string_span(std::array<ArrayElementType, N>& arr) noexcept : span_(arr)
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{
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}
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template <size_t N, class ArrayElementType = std::remove_const_t<element_type>>
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constexpr basic_string_span(const std::array<ArrayElementType, N>& arr) noexcept : span_(arr)
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{
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}
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// Container signature should work for basic_string after C++17 version exists
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template <class Traits, class Allocator>
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constexpr basic_string_span(std::basic_string<element_type, Traits, Allocator>& str)
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: span_(&str[0], str.length())
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{
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}
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template <class Traits, class Allocator>
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constexpr basic_string_span(const std::basic_string<element_type, Traits, Allocator>& str)
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: span_(&str[0], str.length())
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{
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}
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// from containers. Containers must have a pointer type and data() function signatures
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template <class Container,
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class = std::enable_if_t<
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!details::is_basic_string_span<Container>::value &&
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std::is_convertible<typename Container::pointer, pointer>::value &&
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std::is_convertible<typename Container::pointer,
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decltype(std::declval<Container>().data())>::value>>
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constexpr basic_string_span(Container& cont) : span_(cont)
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{
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}
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template <class Container,
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class = std::enable_if_t<
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!details::is_basic_string_span<Container>::value &&
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std::is_convertible<typename Container::pointer, pointer>::value &&
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std::is_convertible<typename Container::pointer,
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decltype(std::declval<Container>().data())>::value>>
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constexpr basic_string_span(const Container& cont) : span_(cont)
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{
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}
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// from string_span
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template <
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class OtherValueType, std::ptrdiff_t OtherExtent,
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class = std::enable_if_t<std::is_convertible<
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typename basic_string_span<OtherValueType, OtherExtent>::impl_type, impl_type>::value>>
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constexpr basic_string_span(basic_string_span<OtherValueType, OtherExtent> other)
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: span_(other.data(), other.length())
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{
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}
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template <index_type Count>
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constexpr basic_string_span<element_type, Count> first() const
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{
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return {span_.template first<Count>()};
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}
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constexpr basic_string_span<element_type, dynamic_extent> first(index_type count) const
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{
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return {span_.first(count)};
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}
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template <index_type Count>
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constexpr basic_string_span<element_type, Count> last() const
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{
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return {span_.template last<Count>()};
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}
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constexpr basic_string_span<element_type, dynamic_extent> last(index_type count) const
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{
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return {span_.last(count)};
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}
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template <index_type Offset, index_type Count>
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constexpr basic_string_span<element_type, Count> subspan() const
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{
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return {span_.template subspan<Offset, Count>()};
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}
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constexpr basic_string_span<element_type, dynamic_extent>
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subspan(index_type offset, index_type count = dynamic_extent) const
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{
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return {span_.subspan(offset, count)};
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}
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constexpr reference operator[](index_type idx) const { return span_[idx]; }
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constexpr reference operator()(index_type idx) const { return span_[idx]; }
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constexpr pointer data() const { return span_.data(); }
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constexpr index_type length() const noexcept { return span_.size(); }
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constexpr index_type size() const noexcept { return span_.size(); }
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constexpr index_type size_bytes() const noexcept { return span_.size_bytes(); }
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constexpr index_type length_bytes() const noexcept { return span_.length_bytes(); }
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constexpr bool empty() const noexcept { return size() == 0; }
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constexpr iterator begin() const noexcept { return span_.begin(); }
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constexpr iterator end() const noexcept { return span_.end(); }
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constexpr const_iterator cbegin() const noexcept { return span_.cbegin(); }
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constexpr const_iterator cend() const noexcept { return span_.cend(); }
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constexpr reverse_iterator rbegin() const noexcept { return span_.rbegin(); }
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constexpr reverse_iterator rend() const noexcept { return span_.rend(); }
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constexpr const_reverse_iterator crbegin() const noexcept { return span_.crbegin(); }
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constexpr const_reverse_iterator crend() const noexcept { return span_.crend(); }
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private:
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static impl_type remove_z(pointer const& sz, std::ptrdiff_t max)
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{
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return {sz, details::length_func<element_type>()(sz, max)};
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}
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template <size_t N>
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static impl_type remove_z(element_type (&sz)[N])
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{
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return remove_z(&sz[0], narrow_cast<std::ptrdiff_t>(N));
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}
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impl_type span_;
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};
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template <std::ptrdiff_t Extent = dynamic_extent>
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using string_span = basic_string_span<char, Extent>;
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template <std::ptrdiff_t Extent = dynamic_extent>
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using cstring_span = basic_string_span<const char, Extent>;
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template <std::ptrdiff_t Extent = dynamic_extent>
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using wstring_span = basic_string_span<wchar_t, Extent>;
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template <std::ptrdiff_t Extent = dynamic_extent>
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using cwstring_span = basic_string_span<const wchar_t, Extent>;
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//
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// to_string() allow (explicit) conversions from string_span to string
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//
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#ifndef GSL_MSVC_HAS_TYPE_DEDUCTION_BUG
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template <typename CharT, std::ptrdiff_t Extent>
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std::basic_string<typename std::remove_const<CharT>::type>
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to_string(basic_string_span<CharT, Extent> view)
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{
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return {view.data(), static_cast<size_t>(view.length())};
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}
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#else
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inline std::string to_string(cstring_span<> view)
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{
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return {view.data(), static_cast<size_t>(view.length())};
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}
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inline std::string to_string(string_span<> view)
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{
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return {view.data(), static_cast<size_t>(view.length())};
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}
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inline std::wstring to_string(cwstring_span<> view)
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{
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return {view.data(), static_cast<size_t>(view.length())};
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}
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inline std::wstring to_string(wstring_span<> view)
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{
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return {view.data(), static_cast<size_t>(view.length())};
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}
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#endif
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template <typename CharT,
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typename Traits = typename std::char_traits<CharT>,
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typename Allocator = std::allocator<CharT>,
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typename gCharT,
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std::ptrdiff_t Extent>
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std::basic_string<CharT, Traits, Allocator> to_basic_string(basic_string_span<gCharT, Extent> view)
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{
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return {view.data(), static_cast<size_t>(view.length())};
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}
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// zero-terminated string span, used to convert
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// zero-terminated spans to legacy strings
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template <typename CharT, std::ptrdiff_t Extent = dynamic_extent>
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class basic_zstring_span
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{
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public:
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using value_type = CharT;
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using const_value_type = std::add_const_t<CharT>;
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using pointer = std::add_pointer_t<value_type>;
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using const_pointer = std::add_pointer_t<const_value_type>;
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using zstring_type = basic_zstring<value_type, Extent>;
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using const_zstring_type = basic_zstring<const_value_type, Extent>;
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using impl_type = span<value_type, Extent>;
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using string_span_type = basic_string_span<value_type, Extent>;
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constexpr basic_zstring_span(impl_type s) noexcept : span_(s)
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{
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// expects a zero-terminated span
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Expects(s[s.size() - 1] == '\0');
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}
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// copy
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constexpr basic_zstring_span(const basic_zstring_span& other) = default;
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// move
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#ifndef GSL_MSVC_NO_DEFAULT_MOVE_CTOR
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constexpr basic_zstring_span(basic_zstring_span&& other) = default;
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#else
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constexpr basic_zstring_span(basic_zstring_span&& other) : span_(std::move(other.span_)) {}
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#endif
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// assign
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constexpr basic_zstring_span& operator=(const basic_zstring_span& other) = default;
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// move assign
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#ifndef GSL_MSVC_NO_DEFAULT_MOVE_CTOR
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constexpr basic_zstring_span& operator=(basic_zstring_span&& other) = default;
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#else
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constexpr basic_zstring_span& operator=(basic_zstring_span&& other)
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{
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span_ = std::move(other.span_);
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return *this;
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}
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#endif
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constexpr bool empty() const noexcept { return span_.size() == 0; }
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constexpr string_span_type as_string_span() const noexcept
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{
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return span_.first(span_.size() - 1);
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}
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constexpr string_span_type ensure_z() const noexcept { return gsl::ensure_z(span_); }
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constexpr const_zstring_type assume_z() const noexcept { return span_.data(); }
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private:
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impl_type span_;
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};
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template <std::ptrdiff_t Max = dynamic_extent>
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using zstring_span = basic_zstring_span<char, Max>;
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template <std::ptrdiff_t Max = dynamic_extent>
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using wzstring_span = basic_zstring_span<wchar_t, Max>;
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template <std::ptrdiff_t Max = dynamic_extent>
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using czstring_span = basic_zstring_span<const char, Max>;
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template <std::ptrdiff_t Max = dynamic_extent>
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using cwzstring_span = basic_zstring_span<const wchar_t, Max>;
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// operator ==
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template <class CharT, std::ptrdiff_t Extent, class T,
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class = std::enable_if_t<
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details::is_basic_string_span<T>::value ||
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std::is_convertible<T, gsl::basic_string_span<std::add_const_t<CharT>>>::value>>
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bool operator==(const gsl::basic_string_span<CharT, Extent>& one, const T& other) noexcept
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{
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gsl::basic_string_span<std::add_const_t<CharT>> tmp(other);
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#ifdef GSL_MSVC_NO_CPP14_STD_EQUAL
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return (one.size() == tmp.size()) && std::equal(one.begin(), one.end(), tmp.begin());
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#else
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return std::equal(one.begin(), one.end(), tmp.begin(), tmp.end());
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#endif
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}
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template <class CharT, std::ptrdiff_t Extent, class T,
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class = std::enable_if_t<
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!details::is_basic_string_span<T>::value &&
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std::is_convertible<T, gsl::basic_string_span<std::add_const_t<CharT>>>::value>>
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bool operator==(const T& one, const gsl::basic_string_span<CharT, Extent>& other) noexcept
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|
{
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gsl::basic_string_span<std::add_const_t<CharT>> tmp(one);
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#ifdef GSL_MSVC_NO_CPP14_STD_EQUAL
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return (tmp.size() == other.size()) && std::equal(tmp.begin(), tmp.end(), other.begin());
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#else
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return std::equal(tmp.begin(), tmp.end(), other.begin(), other.end());
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#endif
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}
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// operator !=
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template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_extent, typename T,
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typename = std::enable_if_t<std::is_convertible<
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T, gsl::basic_string_span<std::add_const_t<CharT>, Extent>>::value>>
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bool operator!=(gsl::basic_string_span<CharT, Extent> one, const T& other) noexcept
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|
{
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return !(one == other);
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}
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|
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|
template <
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|
typename CharT, std::ptrdiff_t Extent = gsl::dynamic_extent, typename T,
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typename Dummy = std::enable_if_t<
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std::is_convertible<T, gsl::basic_string_span<std::add_const_t<CharT>, Extent>>::value &&
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|
!gsl::details::is_basic_string_span<T>::value>>
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|
bool operator!=(const T& one, gsl::basic_string_span<CharT, Extent> other) noexcept
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|
{
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return !(one == other);
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|
}
|
|
|
|
// operator<
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|
template <typename CharT, std::ptrdiff_t Extent = gsl::dynamic_extent, typename T,
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|
typename = std::enable_if_t<std::is_convertible<
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|
T, gsl::basic_string_span<std::add_const_t<CharT>, Extent>>::value>>
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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);
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|
return std::lexicographical_compare(one.begin(), one.end(), tmp.begin(), tmp.end());
|
|
}
|
|
|
|
template <
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|
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);
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|
return std::lexicographical_compare(tmp.begin(), tmp.end(), other.begin(), other.end());
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|
}
|
|
|
|
#ifndef _MSC_VER
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|
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|
// VS treats temp and const containers as convertible to basic_string_span,
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|
// so the cases below are already covered by the previous operators
|
|
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|
template <
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|
typename CharT, std::ptrdiff_t Extent = gsl::dynamic_extent, typename T,
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|
typename DataType = typename T::value_type,
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|
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 &&
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|
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);
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|
return std::lexicographical_compare(one.begin(), one.end(), tmp.begin(), tmp.end());
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|
}
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|
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|
template <
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|
typename CharT, std::ptrdiff_t Extent = gsl::dynamic_extent, typename T,
|
|
typename DataType = typename T::value_type,
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|
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());
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|
}
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|
#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);
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|
}
|
|
|
|
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
|