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1// -*- C++ -*-2//===----------------------------------------------------------------------===//3//4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.5// See https://llvm.org/LICENSE.txt for license information.6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception7//8//===----------------------------------------------------------------------===//9 10#ifndef _LIBCPP___ITERATOR_ITER_MOVE_H11#define _LIBCPP___ITERATOR_ITER_MOVE_H12 13#include <__concepts/class_or_enum.h>14#include <__config>15#include <__iterator/iterator_traits.h>16#include <__type_traits/is_reference.h>17#include <__type_traits/is_referenceable.h>18#include <__type_traits/remove_cvref.h>19#include <__utility/declval.h>20#include <__utility/forward.h>21#include <__utility/move.h>22 23#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)24# pragma GCC system_header25#endif26 27_LIBCPP_PUSH_MACROS28#include <__undef_macros>29 30_LIBCPP_BEGIN_NAMESPACE_STD31 32#if _LIBCPP_STD_VER >= 2033 34// [iterator.cust.move]35 36namespace ranges {37namespace __iter_move {38 39void iter_move() = delete;40 41template <class _Tp>42concept __unqualified_iter_move = __class_or_enum<remove_cvref_t<_Tp>> && requires(_Tp&& __t) {43 // NOLINTNEXTLINE(libcpp-robust-against-adl) iter_swap ADL calls should only be made through ranges::iter_swap44 iter_move(std::forward<_Tp>(__t));45};46 47template <class _Tp>48concept __move_deref = !__unqualified_iter_move<_Tp> && requires(_Tp&& __t) {49 *__t;50 requires is_lvalue_reference_v<decltype(*__t)>;51};52 53template <class _Tp>54concept __just_deref = !__unqualified_iter_move<_Tp> && !__move_deref<_Tp> && requires(_Tp&& __t) {55 *__t;56 requires(!is_lvalue_reference_v<decltype(*__t)>);57};58 59// [iterator.cust.move]60 61struct __fn {62 // NOLINTBEGIN(libcpp-robust-against-adl) iter_move ADL calls should only be made through ranges::iter_move63 template <class _Ip>64 requires __unqualified_iter_move<_Ip>65 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) operator()(_Ip&& __i) const66 noexcept(noexcept(iter_move(std::forward<_Ip>(__i)))) {67 return iter_move(std::forward<_Ip>(__i));68 }69 // NOLINTEND(libcpp-robust-against-adl)70 71 template <class _Ip>72 requires __move_deref<_Ip>73 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Ip&& __i) const74 noexcept(noexcept(std::move(*std::forward<_Ip>(__i)))) -> decltype(std::move(*std::forward<_Ip>(__i))) {75 return std::move(*std::forward<_Ip>(__i));76 }77 78 template <class _Ip>79 requires __just_deref<_Ip>80 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Ip&& __i) const81 noexcept(noexcept(*std::forward<_Ip>(__i))) -> decltype(*std::forward<_Ip>(__i)) {82 return *std::forward<_Ip>(__i);83 }84};85} // namespace __iter_move86 87inline namespace __cpo {88inline constexpr auto iter_move = __iter_move::__fn{};89} // namespace __cpo90} // namespace ranges91 92template <__dereferenceable _Tp>93 requires requires(_Tp& __t) {94 { ranges::iter_move(__t) } -> __referenceable;95 }96using iter_rvalue_reference_t = decltype(ranges::iter_move(std::declval<_Tp&>()));97 98#endif // _LIBCPP_STD_VER >= 2099 100_LIBCPP_END_NAMESPACE_STD101 102_LIBCPP_POP_MACROS103 104#endif // _LIBCPP___ITERATOR_ITER_MOVE_H105