100 lines
2.7 KiB
C++
100 lines
2.7 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___ITERATOR_ITER_MOVE_H
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#define _LIBCPP___ITERATOR_ITER_MOVE_H
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#include <__concepts/class_or_enum.h>
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#include <__config>
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#include <__iterator/iterator_traits.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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#if _LIBCPP_STD_VER > 17
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// [iterator.cust.move]
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namespace ranges {
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namespace __iter_move {
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void iter_move();
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template <class _Tp>
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concept __unqualified_iter_move =
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__class_or_enum<remove_cvref_t<_Tp>> &&
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requires (_Tp&& __t) {
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iter_move(std::forward<_Tp>(__t));
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};
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template<class _Tp>
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concept __move_deref =
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!__unqualified_iter_move<_Tp> &&
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requires (_Tp&& __t) {
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*__t;
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requires is_lvalue_reference_v<decltype(*__t)>;
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};
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template<class _Tp>
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concept __just_deref =
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!__unqualified_iter_move<_Tp> &&
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!__move_deref<_Tp> &&
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requires (_Tp&& __t) {
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*__t;
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requires (!is_lvalue_reference_v<decltype(*__t)>);
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};
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// [iterator.cust.move]
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struct __fn {
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template<class _Ip>
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requires __unqualified_iter_move<_Ip>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) operator()(_Ip&& __i) const
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noexcept(noexcept(iter_move(std::forward<_Ip>(__i))))
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{
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return iter_move(std::forward<_Ip>(__i));
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}
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template<class _Ip>
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requires __move_deref<_Ip>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Ip&& __i) const
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noexcept(noexcept(std::move(*std::forward<_Ip>(__i))))
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-> decltype( std::move(*std::forward<_Ip>(__i)))
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{ return std::move(*std::forward<_Ip>(__i)); }
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template<class _Ip>
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requires __just_deref<_Ip>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Ip&& __i) const
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noexcept(noexcept(*std::forward<_Ip>(__i)))
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-> decltype( *std::forward<_Ip>(__i))
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{ return *std::forward<_Ip>(__i); }
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};
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} // namespace __iter_move
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inline namespace __cpo {
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inline constexpr auto iter_move = __iter_move::__fn{};
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} // namespace __cpo
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} // namespace ranges
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template<__dereferenceable _Tp>
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requires requires(_Tp& __t) { { ranges::iter_move(__t) } -> __can_reference; }
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using iter_rvalue_reference_t = decltype(ranges::iter_move(declval<_Tp&>()));
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#endif // _LIBCPP_STD_VER > 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ITERATOR_ITER_MOVE_H
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