111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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___MEMORY_CONSTRUCT_AT_H
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#define _LIBCPP___MEMORY_CONSTRUCT_AT_H
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#include <__assert>
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#include <__config>
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#include <__iterator/access.h>
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#include <__memory/addressof.h>
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#include <__memory/voidify.h>
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#include <__utility/forward.h>
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#include <__utility/move.h>
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#include <type_traits>
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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_BEGIN_NAMESPACE_STD
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// construct_at
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#if _LIBCPP_STD_VER > 17
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template<class _Tp, class ..._Args, class = decltype(
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::new (declval<void*>()) _Tp(declval<_Args>()...)
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)>
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_LIBCPP_HIDE_FROM_ABI
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constexpr _Tp* construct_at(_Tp* __location, _Args&& ...__args) {
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_LIBCPP_ASSERT(__location, "null pointer given to construct_at");
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return ::new (_VSTD::__voidify(*__location)) _Tp(_VSTD::forward<_Args>(__args)...);
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}
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#endif
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// destroy_at
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// The internal functions are available regardless of the language version (with the exception of the `__destroy_at`
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// taking an array).
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template <class _ForwardIterator>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
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_ForwardIterator __destroy(_ForwardIterator, _ForwardIterator);
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template <class _Tp, typename enable_if<!is_array<_Tp>::value, int>::type = 0>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
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void __destroy_at(_Tp* __loc) {
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_LIBCPP_ASSERT(__loc, "null pointer given to destroy_at");
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__loc->~_Tp();
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}
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#if _LIBCPP_STD_VER > 17
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template <class _Tp, typename enable_if<is_array<_Tp>::value, int>::type = 0>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
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void __destroy_at(_Tp* __loc) {
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_LIBCPP_ASSERT(__loc, "null pointer given to destroy_at");
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_VSTD::__destroy(_VSTD::begin(*__loc), _VSTD::end(*__loc));
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}
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#endif
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template <class _ForwardIterator>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
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_ForwardIterator __destroy(_ForwardIterator __first, _ForwardIterator __last) {
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for (; __first != __last; ++__first)
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_VSTD::__destroy_at(_VSTD::addressof(*__first));
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return __first;
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}
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#if _LIBCPP_STD_VER > 14
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template <class _Tp, enable_if_t<!is_array_v<_Tp>, int> = 0>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
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void destroy_at(_Tp* __loc) {
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_VSTD::__destroy_at(__loc);
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}
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#if _LIBCPP_STD_VER > 17
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template <class _Tp, enable_if_t<is_array_v<_Tp>, int> = 0>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
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void destroy_at(_Tp* __loc) {
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_VSTD::__destroy_at(__loc);
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}
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#endif
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template <class _ForwardIterator>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
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void destroy(_ForwardIterator __first, _ForwardIterator __last) {
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(void)_VSTD::__destroy(_VSTD::move(__first), _VSTD::move(__last));
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}
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template <class _ForwardIterator, class _Size>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
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_ForwardIterator destroy_n(_ForwardIterator __first, _Size __n) {
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for (; __n > 0; (void)++__first, --__n)
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_VSTD::__destroy_at(_VSTD::addressof(*__first));
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return __first;
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}
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#endif // _LIBCPP_STD_VER > 14
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___MEMORY_CONSTRUCT_AT_H
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