forked from OSchip/llvm-project
135 lines
3.8 KiB
C++
135 lines
3.8 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___RANGES_REND_H
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#define _LIBCPP___RANGES_REND_H
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#include <__concepts/class_or_enum.h>
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#include <__concepts/same_as.h>
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#include <__config>
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#include <__iterator/concepts.h>
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#include <__iterator/readable_traits.h>
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#include <__iterator/reverse_iterator.h>
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#include <__ranges/access.h>
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#include <__ranges/rbegin.h>
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#include <__utility/auto_cast.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 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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// [range.access.rend]
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namespace ranges {
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namespace __rend {
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template <class _Tp>
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concept __member_rend =
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__can_borrow<_Tp> &&
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__workaround_52970<_Tp> &&
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requires(_Tp&& __t) {
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ranges::rbegin(__t);
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{ _LIBCPP_AUTO_CAST(__t.rend()) } -> sentinel_for<decltype(ranges::rbegin(__t))>;
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};
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void rend(auto&) = delete;
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void rend(const auto&) = delete;
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template <class _Tp>
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concept __unqualified_rend =
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!__member_rend<_Tp> &&
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__can_borrow<_Tp> &&
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__class_or_enum<remove_cvref_t<_Tp>> &&
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requires(_Tp&& __t) {
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ranges::rbegin(__t);
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{ _LIBCPP_AUTO_CAST(rend(__t)) } -> sentinel_for<decltype(ranges::rbegin(__t))>;
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};
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template <class _Tp>
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concept __can_reverse =
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__can_borrow<_Tp> &&
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!__member_rend<_Tp> &&
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!__unqualified_rend<_Tp> &&
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requires(_Tp&& __t) {
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{ ranges::begin(__t) } -> same_as<decltype(ranges::end(__t))>;
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{ ranges::begin(__t) } -> bidirectional_iterator;
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};
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class __fn {
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public:
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template <class _Tp>
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requires __member_rend<_Tp>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
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noexcept(noexcept(_LIBCPP_AUTO_CAST(__t.rend())))
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{
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return _LIBCPP_AUTO_CAST(__t.rend());
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}
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template <class _Tp>
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requires __unqualified_rend<_Tp>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
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noexcept(noexcept(_LIBCPP_AUTO_CAST(rend(__t))))
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{
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return _LIBCPP_AUTO_CAST(rend(__t));
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}
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template <class _Tp>
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requires __can_reverse<_Tp>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
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noexcept(noexcept(ranges::begin(__t)))
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{
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return std::make_reverse_iterator(ranges::begin(__t));
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}
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void operator()(auto&&) const = delete;
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};
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} // namespace __rend
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inline namespace __cpo {
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inline constexpr auto rend = __rend::__fn{};
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} // namespace __cpo
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} // namespace ranges
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// [range.access.crend]
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namespace ranges {
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namespace __crend {
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struct __fn {
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template <class _Tp>
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requires is_lvalue_reference_v<_Tp&&>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI
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constexpr auto operator()(_Tp&& __t) const
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noexcept(noexcept(ranges::rend(static_cast<const remove_reference_t<_Tp>&>(__t))))
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-> decltype( ranges::rend(static_cast<const remove_reference_t<_Tp>&>(__t)))
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{ return ranges::rend(static_cast<const remove_reference_t<_Tp>&>(__t)); }
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template <class _Tp>
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requires is_rvalue_reference_v<_Tp&&>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI
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constexpr auto operator()(_Tp&& __t) const
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noexcept(noexcept(ranges::rend(static_cast<const _Tp&&>(__t))))
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-> decltype( ranges::rend(static_cast<const _Tp&&>(__t)))
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{ return ranges::rend(static_cast<const _Tp&&>(__t)); }
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};
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} // namespace __crend
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inline namespace __cpo {
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inline constexpr auto crend = __crend::__fn{};
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} // namespace __cpo
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} // namespace ranges
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#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___RANGES_REND_H
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