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f332455dd9
This patch separates the destroy algorithms from the primitive construct_at and destroy_at operations, which are conceptually not algorithms. This makes it easier to start using these destroy algorithms from upcoming relocation facilities. As part of this, it also implements `std::destroy_at` for arrays without relying on the `std::destroy` algorithm, which is conceptually a higher-level facility.
73 lines
1.9 KiB
C++
73 lines
1.9 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_RANGES_CONSTRUCT_AT_H
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#define _LIBCPP___MEMORY_RANGES_CONSTRUCT_AT_H
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#include <__concepts/destructible.h>
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#include <__config>
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#include <__iterator/incrementable_traits.h>
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#include <__iterator/iterator_traits.h>
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#include <__memory/concepts.h>
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#include <__memory/construct_at.h>
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#include <__ranges/access.h>
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#include <__ranges/concepts.h>
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#include <__ranges/dangling.h>
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#include <__utility/declval.h>
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#include <__utility/forward.h>
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#include <__utility/move.h>
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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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#if _LIBCPP_STD_VER >= 20
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namespace ranges {
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// construct_at
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struct __construct_at {
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template <class _Tp, class... _Args, class = decltype(::new(std::declval<void*>()) _Tp(std::declval<_Args>()...))>
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_LIBCPP_HIDE_FROM_ABI constexpr _Tp* operator()(_Tp* __location, _Args&&... __args) const {
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return std::construct_at(__location, std::forward<_Args>(__args)...);
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}
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};
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inline namespace __cpo {
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inline constexpr auto construct_at = __construct_at{};
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} // namespace __cpo
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// destroy_at
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struct __destroy_at {
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template <destructible _Tp>
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_LIBCPP_HIDE_FROM_ABI constexpr void operator()(_Tp* __location) const noexcept {
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std::destroy_at(__location);
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}
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};
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inline namespace __cpo {
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inline constexpr auto destroy_at = __destroy_at{};
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} // namespace __cpo
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} // namespace ranges
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___MEMORY_RANGES_CONSTRUCT_AT_H
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