forked from OSchip/llvm-project
131 lines
3.8 KiB
C++
131 lines
3.8 KiB
C++
// -*- C++ -*-
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
#ifndef _LIBCPP___RANGES_RBEGIN_H
|
|
#define _LIBCPP___RANGES_RBEGIN_H
|
|
|
|
#include <__concepts/class_or_enum.h>
|
|
#include <__concepts/same_as.h>
|
|
#include <__config>
|
|
#include <__iterator/concepts.h>
|
|
#include <__iterator/readable_traits.h>
|
|
#include <__iterator/reverse_iterator.h>
|
|
#include <__ranges/access.h>
|
|
#include <__utility/auto_cast.h>
|
|
#include <type_traits>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_CONCEPTS) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
|
|
|
|
// [ranges.access.rbegin]
|
|
|
|
namespace ranges {
|
|
namespace __rbegin {
|
|
template <class _Tp>
|
|
concept __member_rbegin =
|
|
__can_borrow<_Tp> &&
|
|
__workaround_52970<_Tp> &&
|
|
requires(_Tp&& __t) {
|
|
{ _LIBCPP_AUTO_CAST(__t.rbegin()) } -> input_or_output_iterator;
|
|
};
|
|
|
|
void rbegin(auto&) = delete;
|
|
void rbegin(const auto&) = delete;
|
|
|
|
template <class _Tp>
|
|
concept __unqualified_rbegin =
|
|
!__member_rbegin<_Tp> &&
|
|
__can_borrow<_Tp> &&
|
|
__class_or_enum<remove_cvref_t<_Tp>> &&
|
|
requires(_Tp&& __t) {
|
|
{ _LIBCPP_AUTO_CAST(rbegin(__t)) } -> input_or_output_iterator;
|
|
};
|
|
|
|
template <class _Tp>
|
|
concept __can_reverse =
|
|
__can_borrow<_Tp> &&
|
|
!__member_rbegin<_Tp> &&
|
|
!__unqualified_rbegin<_Tp> &&
|
|
requires(_Tp&& __t) {
|
|
{ ranges::begin(__t) } -> same_as<decltype(ranges::end(__t))>;
|
|
{ ranges::begin(__t) } -> bidirectional_iterator;
|
|
};
|
|
|
|
struct __fn {
|
|
template <class _Tp>
|
|
requires __member_rbegin<_Tp>
|
|
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
|
|
noexcept(noexcept(_LIBCPP_AUTO_CAST(__t.rbegin())))
|
|
{
|
|
return _LIBCPP_AUTO_CAST(__t.rbegin());
|
|
}
|
|
|
|
template <class _Tp>
|
|
requires __unqualified_rbegin<_Tp>
|
|
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
|
|
noexcept(noexcept(_LIBCPP_AUTO_CAST(rbegin(__t))))
|
|
{
|
|
return _LIBCPP_AUTO_CAST(rbegin(__t));
|
|
}
|
|
|
|
template <class _Tp>
|
|
requires __can_reverse<_Tp>
|
|
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
|
|
noexcept(noexcept(ranges::end(__t)))
|
|
{
|
|
return std::make_reverse_iterator(ranges::end(__t));
|
|
}
|
|
|
|
void operator()(auto&&) const = delete;
|
|
};
|
|
} // namespace __rbegin
|
|
|
|
inline namespace __cpo {
|
|
inline constexpr auto rbegin = __rbegin::__fn{};
|
|
} // namespace __cpo
|
|
} // namespace ranges
|
|
|
|
// [range.access.crbegin]
|
|
|
|
namespace ranges {
|
|
namespace __crbegin {
|
|
struct __fn {
|
|
template <class _Tp>
|
|
requires is_lvalue_reference_v<_Tp&&>
|
|
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI
|
|
constexpr auto operator()(_Tp&& __t) const
|
|
noexcept(noexcept(ranges::rbegin(static_cast<const remove_reference_t<_Tp>&>(__t))))
|
|
-> decltype( ranges::rbegin(static_cast<const remove_reference_t<_Tp>&>(__t)))
|
|
{ return ranges::rbegin(static_cast<const remove_reference_t<_Tp>&>(__t)); }
|
|
|
|
template <class _Tp>
|
|
requires is_rvalue_reference_v<_Tp&&>
|
|
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI
|
|
constexpr auto operator()(_Tp&& __t) const
|
|
noexcept(noexcept(ranges::rbegin(static_cast<const _Tp&&>(__t))))
|
|
-> decltype( ranges::rbegin(static_cast<const _Tp&&>(__t)))
|
|
{ return ranges::rbegin(static_cast<const _Tp&&>(__t)); }
|
|
};
|
|
} // namespace __crbegin
|
|
|
|
inline namespace __cpo {
|
|
inline constexpr auto crbegin = __crbegin::__fn{};
|
|
} // namespace __cpo
|
|
} // namespace ranges
|
|
|
|
#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP___RANGES_RBEGIN_H
|