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libcxx: backport llvm/llvm-project#155786

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https://github.com/llvm/llvm-project/pull/155786
This commit is contained in:
Alex Rønne Petersen 2025-10-14 12:10:41 +02:00
parent 10ea69912f
commit bc58b5dc53
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2 changed files with 35 additions and 4 deletions
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14
lib/libcxx/include/__functional/hash.h
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@ -21,6 +21,7 @@
#include <__type_traits/is_enum.h>
#include <__type_traits/is_floating_point.h>
#include <__type_traits/is_integral.h>
#include <__type_traits/is_unqualified.h>
#include <__type_traits/underlying_type.h>
#include <__utility/pair.h>
#include <__utility/swap.h>
@ -355,7 +356,8 @@ struct __hash_impl {
};
template <class _Tp>
struct __hash_impl<_Tp, __enable_if_t<is_enum<_Tp>::value> > : __unary_function<_Tp, size_t> {
struct __hash_impl<_Tp, __enable_if_t<is_enum<_Tp>::value && __is_unqualified_v<_Tp> > >
: __unary_function<_Tp, size_t> {
_LIBCPP_HIDE_FROM_ABI size_t operator()(_Tp __v) const _NOEXCEPT {
using type = __underlying_type_t<_Tp>;
return hash<type>()(static_cast<type>(__v));
@ -363,17 +365,21 @@ struct __hash_impl<_Tp, __enable_if_t<is_enum<_Tp>::value> > : __unary_function<
};
template <class _Tp>
struct __hash_impl<_Tp, __enable_if_t<is_integral<_Tp>::value && (sizeof(_Tp) <= sizeof(size_t))> >
struct __hash_impl<
_Tp,
__enable_if_t<is_integral<_Tp>::value && __is_unqualified_v<_Tp> && (sizeof(_Tp) <= sizeof(size_t))> >
: __unary_function<_Tp, size_t> {
_LIBCPP_HIDE_FROM_ABI size_t operator()(_Tp __v) const _NOEXCEPT { return static_cast<size_t>(__v); }
};
template <class _Tp>
struct __hash_impl<_Tp, __enable_if_t<is_integral<_Tp>::value && (sizeof(_Tp) > sizeof(size_t))> >
struct __hash_impl<_Tp,
__enable_if_t<is_integral<_Tp>::value && __is_unqualified_v<_Tp> && (sizeof(_Tp) > sizeof(size_t))> >
: __scalar_hash<_Tp> {};
template <class _Tp>
struct __hash_impl<_Tp, __enable_if_t<is_floating_point<_Tp>::value> > : __scalar_hash<_Tp> {
struct __hash_impl<_Tp, __enable_if_t<is_floating_point<_Tp>::value && __is_unqualified_v<_Tp> > >
: __scalar_hash<_Tp> {
_LIBCPP_HIDE_FROM_ABI size_t operator()(_Tp __v) const _NOEXCEPT {
// -0.0 and 0.0 should return same hash
if (__v == 0.0f)

25
lib/libcxx/include/__type_traits/is_unqualified.h Normal file
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@ -0,0 +1,25 @@
//===----------------------------------------------------------------------===//
//
// 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___TYPE_TRAITS_IS_UNQUALIFIED_H
#define _LIBCPP___TYPE_TRAITS_IS_UNQUALIFIED_H
#include <__config>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Tp>
inline const bool __is_unqualified_v = __is_same(_Tp, __remove_cvref(_Tp));
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___TYPE_TRAITS_IS_UNQUALIFIED_H