368faacac7
This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9, which were related to the original commit). As landed, 5aaefa51 had unintended consequences on some downstream bots and didn't have proper coverage upstream due to a few subtle things. Implementing this is something we should do in libc++, however we'll first need to address a few issues listed in https://reviews.llvm.org/D106124#3349710. Differential Revision: https://reviews.llvm.org/D120683
125 lines
3.4 KiB
C++
125 lines
3.4 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/readable_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_BEGIN_NAMESPACE_STD
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#if !defined(_LIBCPP_HAS_NO_CONCEPTS) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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namespace ranges {
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// construct_at
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namespace __construct_at {
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struct __fn {
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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* operator()(_Tp* __location, _Args&& ...__args) const {
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return _VSTD::construct_at(__location, _VSTD::forward<_Args>(__args)...);
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}
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};
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} // namespace __construct_at
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inline namespace __cpo {
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inline constexpr auto construct_at = __construct_at::__fn{};
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} // namespace __cpo
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// destroy_at
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namespace __destroy_at {
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struct __fn {
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template <destructible _Tp>
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_LIBCPP_HIDE_FROM_ABI
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constexpr void operator()(_Tp* __location) const noexcept {
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_VSTD::destroy_at(__location);
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}
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};
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} // namespace __destroy_at
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inline namespace __cpo {
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inline constexpr auto destroy_at = __destroy_at::__fn{};
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} // namespace __cpo
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// destroy
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namespace __destroy {
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struct __fn {
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template <__nothrow_input_iterator _InputIterator, __nothrow_sentinel_for<_InputIterator> _Sentinel>
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requires destructible<iter_value_t<_InputIterator>>
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_LIBCPP_HIDE_FROM_ABI
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constexpr _InputIterator operator()(_InputIterator __first, _Sentinel __last) const noexcept {
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return _VSTD::__destroy(_VSTD::move(__first), _VSTD::move(__last));
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}
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template <__nothrow_input_range _InputRange>
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requires destructible<range_value_t<_InputRange>>
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_LIBCPP_HIDE_FROM_ABI
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constexpr borrowed_iterator_t<_InputRange> operator()(_InputRange&& __range) const noexcept {
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return (*this)(ranges::begin(__range), ranges::end(__range));
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}
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};
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} // namespace __destroy
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inline namespace __cpo {
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inline constexpr auto destroy = __destroy::__fn{};
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} // namespace __cpo
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// destroy_n
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namespace __destroy_n {
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struct __fn {
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template <__nothrow_input_iterator _InputIterator>
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requires destructible<iter_value_t<_InputIterator>>
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_LIBCPP_HIDE_FROM_ABI
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constexpr _InputIterator operator()(_InputIterator __first, iter_difference_t<_InputIterator> __n) const noexcept {
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return _VSTD::destroy_n(_VSTD::move(__first), __n);
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}
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};
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} // namespace __destroy_n
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inline namespace __cpo {
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inline constexpr auto destroy_n = __destroy_n::__fn{};
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} // namespace __cpo
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} // namespace ranges
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#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___MEMORY_RANGES_CONSTRUCT_AT_H
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