c99f5b2af1
Also, improve tests for std::destroy and std::destroy_n so that they check for array support. These changes are part of http://wg21.link/p0896 (the One Ranges proposal). Differential Revision: https://reviews.llvm.org/D106916
91 lines
2.5 KiB
C++
91 lines
2.5 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 <__config>
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#include <__debug>
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#include <__iterator/access.h>
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#include <__memory/addressof.h>
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#include <__utility/forward.h>
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#include <type_traits>
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#include <utility>
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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_PUSH_MACROS
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#include <__undef_macros>
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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_INLINE_VISIBILITY
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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 ((void*)__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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#if _LIBCPP_STD_VER > 14
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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, _ForwardIterator);
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template <class _Tp, _EnableIf<!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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_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, _EnableIf<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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_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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void 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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}
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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
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___MEMORY_CONSTRUCT_AT_H
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