forked from OSchip/llvm-project
86 lines
2.4 KiB
C++
86 lines
2.4 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 <__config>
|
|
#include <__debug>
|
|
#include <__iterator/access.h>
|
|
#include <__memory/addressof.h>
|
|
#include <__utility/forward.h>
|
|
#include <type_traits>
|
|
#include <utility>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
#pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
// construct_at
|
|
|
|
#if _LIBCPP_STD_VER > 17
|
|
|
|
template<class _Tp, class ..._Args, class = decltype(
|
|
::new (declval<void*>()) _Tp(declval<_Args>()...)
|
|
)>
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr _Tp* construct_at(_Tp* __location, _Args&& ...__args) {
|
|
_LIBCPP_ASSERT(__location, "null pointer given to construct_at");
|
|
return ::new ((void*)__location) _Tp(_VSTD::forward<_Args>(__args)...);
|
|
}
|
|
|
|
#endif
|
|
|
|
// destroy_at
|
|
|
|
#if _LIBCPP_STD_VER > 14
|
|
|
|
template <class _ForwardIterator>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
|
|
void destroy(_ForwardIterator, _ForwardIterator);
|
|
|
|
template <class _Tp, enable_if_t<!is_array_v<_Tp>, int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
|
|
void destroy_at(_Tp* __loc) {
|
|
_LIBCPP_ASSERT(__loc, "null pointer given to destroy_at");
|
|
__loc->~_Tp();
|
|
}
|
|
|
|
#if _LIBCPP_STD_VER > 17
|
|
template <class _Tp, enable_if_t<is_array_v<_Tp>, int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
|
|
void destroy_at(_Tp* __loc) {
|
|
_LIBCPP_ASSERT(__loc, "null pointer given to destroy_at");
|
|
_VSTD::destroy(_VSTD::begin(*__loc), _VSTD::end(*__loc));
|
|
}
|
|
#endif
|
|
|
|
template <class _ForwardIterator>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
|
|
void destroy(_ForwardIterator __first, _ForwardIterator __last) {
|
|
for (; __first != __last; ++__first)
|
|
_VSTD::destroy_at(_VSTD::addressof(*__first));
|
|
}
|
|
|
|
template <class _ForwardIterator, class _Size>
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
|
|
_ForwardIterator destroy_n(_ForwardIterator __first, _Size __n) {
|
|
for (; __n > 0; (void)++__first, --__n)
|
|
_VSTD::destroy_at(_VSTD::addressof(*__first));
|
|
return __first;
|
|
}
|
|
|
|
#endif
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP___MEMORY_CONSTRUCT_AT_H
|