mirror of
https://codeberg.org/ziglang/zig.git
synced 2025-12-06 22:04:21 +00:00
156ab87500
See: * https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319 * https://discourse.llvm.org/t/rfc-project-hand-in-hand-llvm-libc-libc-code-sharing/77701 We're dropping support for C++03 for Zig due to the first change; it would be insane to ship 1018 duplicate header files just for this outdated use case. As a result of the second change, I had to bring in a subset of the headers from llvm-libc since libc++ now depends on these. Hopefully we can continue to get away with not copying the entirety of llvm-libc.
53 lines
1.5 KiB
C++
Vendored
53 lines
1.5 KiB
C++
Vendored
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef _LIBCPP___COMPARE_SYNTH_THREE_WAY_H
|
|
#define _LIBCPP___COMPARE_SYNTH_THREE_WAY_H
|
|
|
|
#include <__compare/ordering.h>
|
|
#include <__compare/three_way_comparable.h>
|
|
#include <__concepts/boolean_testable.h>
|
|
#include <__config>
|
|
#include <__utility/declval.h>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
#if _LIBCPP_STD_VER >= 20
|
|
|
|
// [expos.only.func]
|
|
|
|
_LIBCPP_HIDE_FROM_ABI inline constexpr auto __synth_three_way = []<class _Tp, class _Up>(const _Tp& __t, const _Up& __u)
|
|
requires requires {
|
|
{ __t < __u } -> __boolean_testable;
|
|
{ __u < __t } -> __boolean_testable;
|
|
}
|
|
{
|
|
if constexpr (three_way_comparable_with<_Tp, _Up>) {
|
|
return __t <=> __u;
|
|
} else {
|
|
if (__t < __u)
|
|
return weak_ordering::less;
|
|
if (__u < __t)
|
|
return weak_ordering::greater;
|
|
return weak_ordering::equivalent;
|
|
}
|
|
};
|
|
|
|
template <class _Tp, class _Up = _Tp>
|
|
using __synth_three_way_result _LIBCPP_NODEBUG =
|
|
decltype(std::__synth_three_way(std::declval<_Tp&>(), std::declval<_Up&>()));
|
|
|
|
#endif // _LIBCPP_STD_VER >= 20
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP___COMPARE_SYNTH_THREE_WAY_H
|