e78f53d1e8
This reverts commit 68c04b0ae6.
This disables the IWYU mapping that caused the failure, since
the headers aren't reachable for now.
This is the first part of the "Freezing C++03 headers" proposal
explained in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319/58.
This patch mechanically copies the headers as of the LLVM 19.1 release
into a subdirectory of libc++ so that we can start using these headers
when building in C++03 mode. We are going to be backporting important
changes to that copy of the headers until the LLVM 21 release. After the
LLVM 21 release, only critical bugfixes will be fixed in the C++03 copy
of the headers.
This patch only performs a copy of the headers -- these headers are
still unused by the rest of the codebase.
129 lines
4.3 KiB
C++
129 lines
4.3 KiB
C++
// -*- C++ -*-
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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___MEMORY_CONSTRUCT_AT_H
|
|
#define _LIBCPP___MEMORY_CONSTRUCT_AT_H
|
|
|
|
#include <__assert>
|
|
#include <__config>
|
|
#include <__iterator/access.h>
|
|
#include <__memory/addressof.h>
|
|
#include <__memory/voidify.h>
|
|
#include <__type_traits/enable_if.h>
|
|
#include <__type_traits/is_array.h>
|
|
#include <__utility/declval.h>
|
|
#include <__utility/forward.h>
|
|
#include <__utility/move.h>
|
|
#include <new>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_PUSH_MACROS
|
|
#include <__undef_macros>
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
// construct_at
|
|
|
|
#if _LIBCPP_STD_VER >= 20
|
|
|
|
template <class _Tp, class... _Args, class = decltype(::new(std::declval<void*>()) _Tp(std::declval<_Args>()...))>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr _Tp* construct_at(_Tp* __location, _Args&&... __args) {
|
|
_LIBCPP_ASSERT_NON_NULL(__location != nullptr, "null pointer given to construct_at");
|
|
return ::new (std::__voidify(*__location)) _Tp(std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
#endif
|
|
|
|
template <class _Tp, class... _Args, class = decltype(::new(std::declval<void*>()) _Tp(std::declval<_Args>()...))>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp* __construct_at(_Tp* __location, _Args&&... __args) {
|
|
#if _LIBCPP_STD_VER >= 20
|
|
return std::construct_at(__location, std::forward<_Args>(__args)...);
|
|
#else
|
|
return _LIBCPP_ASSERT_NON_NULL(__location != nullptr, "null pointer given to construct_at"),
|
|
::new (std::__voidify(*__location)) _Tp(std::forward<_Args>(__args)...);
|
|
#endif
|
|
}
|
|
|
|
// destroy_at
|
|
|
|
// The internal functions are available regardless of the language version (with the exception of the `__destroy_at`
|
|
// taking an array).
|
|
|
|
template <class _ForwardIterator>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator __destroy(_ForwardIterator, _ForwardIterator);
|
|
|
|
template <class _Tp, __enable_if_t<!is_array<_Tp>::value, int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __destroy_at(_Tp* __loc) {
|
|
_LIBCPP_ASSERT_NON_NULL(__loc != nullptr, "null pointer given to destroy_at");
|
|
__loc->~_Tp();
|
|
}
|
|
|
|
#if _LIBCPP_STD_VER >= 20
|
|
template <class _Tp, __enable_if_t<is_array<_Tp>::value, int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __destroy_at(_Tp* __loc) {
|
|
_LIBCPP_ASSERT_NON_NULL(__loc != nullptr, "null pointer given to destroy_at");
|
|
std::__destroy(std::begin(*__loc), std::end(*__loc));
|
|
}
|
|
#endif
|
|
|
|
template <class _ForwardIterator>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
|
|
__destroy(_ForwardIterator __first, _ForwardIterator __last) {
|
|
for (; __first != __last; ++__first)
|
|
std::__destroy_at(std::addressof(*__first));
|
|
return __first;
|
|
}
|
|
|
|
template <class _BidirectionalIterator>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _BidirectionalIterator
|
|
__reverse_destroy(_BidirectionalIterator __first, _BidirectionalIterator __last) {
|
|
while (__last != __first) {
|
|
--__last;
|
|
std::__destroy_at(std::addressof(*__last));
|
|
}
|
|
return __last;
|
|
}
|
|
|
|
#if _LIBCPP_STD_VER >= 17
|
|
|
|
template <class _Tp, enable_if_t<!is_array_v<_Tp>, int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void destroy_at(_Tp* __loc) {
|
|
std::__destroy_at(__loc);
|
|
}
|
|
|
|
# if _LIBCPP_STD_VER >= 20
|
|
template <class _Tp, enable_if_t<is_array_v<_Tp>, int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void destroy_at(_Tp* __loc) {
|
|
std::__destroy_at(__loc);
|
|
}
|
|
# endif
|
|
|
|
template <class _ForwardIterator>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void destroy(_ForwardIterator __first, _ForwardIterator __last) {
|
|
(void)std::__destroy(std::move(__first), std::move(__last));
|
|
}
|
|
|
|
template <class _ForwardIterator, class _Size>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator destroy_n(_ForwardIterator __first, _Size __n) {
|
|
for (; __n > 0; (void)++__first, --__n)
|
|
std::__destroy_at(std::addressof(*__first));
|
|
return __first;
|
|
}
|
|
|
|
#endif // _LIBCPP_STD_VER >= 17
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
_LIBCPP_POP_MACROS
|
|
|
|
#endif // _LIBCPP___MEMORY_CONSTRUCT_AT_H
|