forked from OSchip/llvm-project
95 lines
3.0 KiB
C
95 lines
3.0 KiB
C
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// -*- 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_SWAP_H
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#define _LIBCPP___ITERATOR_ITER_SWAP_H
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#include <__config>
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#include <__iterator/concepts.h>
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#include <__iterator/iter_move.h>
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#include <__iterator/iterator_traits.h>
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#include <__iterator/readable_traits.h>
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#include <__ranges/access.h>
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#include <concepts>
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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_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if !defined(_LIBCPP_HAS_NO_RANGES)
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namespace ranges {
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namespace __iter_swap {
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template<class _I1, class _I2>
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void iter_swap(_I1, _I2) = delete;
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template<class _T1, class _T2>
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concept __unqualified_iter_swap = requires(_T1&& __x, _T2&& __y) {
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iter_swap(_VSTD::forward<_T1>(__x), _VSTD::forward<_T2>(__y));
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};
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template<class _T1, class _T2>
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concept __readable_swappable =
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indirectly_readable<_T1> && indirectly_readable<_T2> &&
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swappable_with<iter_reference_t<_T1>, iter_reference_t<_T2>>;
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struct __fn {
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template <class _T1, class _T2>
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requires __unqualified_iter_swap<_T1, _T2>
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constexpr void operator()(_T1&& __x, _T2&& __y) const
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noexcept(noexcept(iter_swap(_VSTD::forward<_T1>(__x), _VSTD::forward<_T2>(__y))))
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{
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(void)iter_swap(_VSTD::forward<_T1>(__x), _VSTD::forward<_T2>(__y));
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}
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template <class _T1, class _T2>
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requires (!__unqualified_iter_swap<_T1, _T2>) &&
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__readable_swappable<_T1, _T2>
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constexpr void operator()(_T1&& __x, _T2&& __y) const
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noexcept(noexcept(ranges::swap(*_VSTD::forward<_T1>(__x), *_VSTD::forward<_T2>(__y))))
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{
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ranges::swap(*_VSTD::forward<_T1>(__x), *_VSTD::forward<_T2>(__y));
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}
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template <class _T1, class _T2>
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requires (!__unqualified_iter_swap<_T1, _T2> &&
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!__readable_swappable<_T1, _T2>) &&
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indirectly_movable_storable<_T1, _T2> &&
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indirectly_movable_storable<_T2, _T1>
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constexpr void operator()(_T1&& __x, _T2&& __y) const
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noexcept(noexcept(iter_value_t<_T2>(ranges::iter_move(__y))) &&
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noexcept(*__y = ranges::iter_move(__x)) &&
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noexcept(*_VSTD::forward<_T1>(__x) = declval<iter_value_t<_T2>>()))
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{
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iter_value_t<_T2> __old(ranges::iter_move(__y));
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*__y = ranges::iter_move(__x);
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*_VSTD::forward<_T1>(__x) = _VSTD::move(__old);
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}
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};
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} // end namespace __iter_swap
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inline namespace __cpo {
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inline constexpr auto iter_swap = __iter_swap::__fn{};
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} // namespace __cpo
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} // namespace ranges
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#endif // !defined(_LIBCPP_HAS_NO_RANGES)
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___ITERATOR_ITER_SWAP_H
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