8706d82bd4
https://wg21.link/#support `[[nodiscard]]` should be applied to functions where discarding the return value is most likely a correctness issue. - https://libcxx.llvm.org/CodingGuidelines.html#apply-nodiscard-where-relevant The following was implemented in this patch: - [x] `<compare>` - [x] `<corotine>` - [x] `<initializer_list>` - [x] Integer comparisons --------- Co-authored-by: Hristo Hristov <zingam@outlook.com> Co-authored-by: A. Jiang <de34@live.cn>
94 lines
3.6 KiB
C++
94 lines
3.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___UTILITY_CMP_H
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#define _LIBCPP___UTILITY_CMP_H
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#include <__config>
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#include <__type_traits/integer_traits.h>
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#include <__type_traits/is_signed.h>
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#include <__type_traits/make_unsigned.h>
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#include <limits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 20
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template <typename _Tp, typename _Ip>
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concept __comparison_can_promote_to =
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sizeof(_Tp) < sizeof(_Ip) || (sizeof(_Tp) == sizeof(_Ip) && __signed_integer<_Tp>);
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template <__signed_or_unsigned_integer _Tp, __signed_or_unsigned_integer _Up>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool cmp_equal(_Tp __t, _Up __u) noexcept {
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if constexpr (is_signed_v<_Tp> == is_signed_v<_Up>)
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return __t == __u;
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else if constexpr (__comparison_can_promote_to<_Tp, int> && __comparison_can_promote_to<_Up, int>)
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return static_cast<int>(__t) == static_cast<int>(__u);
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else if constexpr (__comparison_can_promote_to<_Tp, long long> && __comparison_can_promote_to<_Up, long long>)
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return static_cast<long long>(__t) == static_cast<long long>(__u);
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else if constexpr (is_signed_v<_Tp>)
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return __t < 0 ? false : make_unsigned_t<_Tp>(__t) == __u;
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else
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return __u < 0 ? false : __t == make_unsigned_t<_Up>(__u);
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}
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template <__signed_or_unsigned_integer _Tp, __signed_or_unsigned_integer _Up>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool cmp_not_equal(_Tp __t, _Up __u) noexcept {
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return !std::cmp_equal(__t, __u);
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}
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template <__signed_or_unsigned_integer _Tp, __signed_or_unsigned_integer _Up>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool cmp_less(_Tp __t, _Up __u) noexcept {
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if constexpr (is_signed_v<_Tp> == is_signed_v<_Up>)
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return __t < __u;
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else if constexpr (__comparison_can_promote_to<_Tp, int> && __comparison_can_promote_to<_Up, int>)
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return static_cast<int>(__t) < static_cast<int>(__u);
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else if constexpr (__comparison_can_promote_to<_Tp, long long> && __comparison_can_promote_to<_Up, long long>)
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return static_cast<long long>(__t) < static_cast<long long>(__u);
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else if constexpr (is_signed_v<_Tp>)
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return __t < 0 ? true : make_unsigned_t<_Tp>(__t) < __u;
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else
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return __u < 0 ? false : __t < make_unsigned_t<_Up>(__u);
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}
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template <__signed_or_unsigned_integer _Tp, __signed_or_unsigned_integer _Up>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool cmp_greater(_Tp __t, _Up __u) noexcept {
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return std::cmp_less(__u, __t);
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}
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template <__signed_or_unsigned_integer _Tp, __signed_or_unsigned_integer _Up>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool cmp_less_equal(_Tp __t, _Up __u) noexcept {
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return !std::cmp_greater(__t, __u);
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}
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template <__signed_or_unsigned_integer _Tp, __signed_or_unsigned_integer _Up>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool cmp_greater_equal(_Tp __t, _Up __u) noexcept {
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return !std::cmp_less(__t, __u);
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}
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template <__signed_or_unsigned_integer _Tp, __signed_or_unsigned_integer _Up>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool in_range(_Up __u) noexcept {
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return std::cmp_less_equal(__u, numeric_limits<_Tp>::max()) &&
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std::cmp_greater_equal(__u, numeric_limits<_Tp>::min());
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}
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___UTILITY_CMP_H
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