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// -*- 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_ACCESS_H
#define _LIBCPP___RANGES_ACCESS_H
#include <__concepts/class_or_enum.h>
#include <__config>
#include <__iterator/concepts.h>
#include <__iterator/readable_traits.h>
#include <__ranges/enable_borrowed_range.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 _LIBCPP_STD_VER > 17
namespace ranges {
template <class _Tp>
concept __can_borrow =
is_lvalue_reference_v<_Tp> || enable_borrowed_range<remove_cvref_t<_Tp>>;
} // namespace ranges
// [range.access.begin]
namespace ranges {
namespace __begin {
template <class _Tp>
concept __member_begin =
__can_borrow<_Tp> &&
__workaround_52970<_Tp> &&
requires(_Tp&& __t) {
{ _LIBCPP_AUTO_CAST(__t.begin()) } -> input_or_output_iterator;
};
void begin(auto&) = delete;
void begin(const auto&) = delete;
template <class _Tp>
concept __unqualified_begin =
!__member_begin<_Tp> &&
__can_borrow<_Tp> &&
__class_or_enum<remove_cvref_t<_Tp>> &&
requires(_Tp && __t) {
{ _LIBCPP_AUTO_CAST(begin(__t)) } -> input_or_output_iterator;
};
struct __fn {
template <class _Tp>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp (&__t)[]) const noexcept
requires (sizeof(_Tp) >= 0) // Disallow incomplete element types.
{
return __t + 0;
}
template <class _Tp, size_t _Np>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp (&__t)[_Np]) const noexcept
requires (sizeof(_Tp) >= 0) // Disallow incomplete element types.
{
return __t + 0;
}
template <class _Tp>
requires __member_begin<_Tp>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
noexcept(noexcept(_LIBCPP_AUTO_CAST(__t.begin())))
{
return _LIBCPP_AUTO_CAST(__t.begin());
}
template <class _Tp>
requires __unqualified_begin<_Tp>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
noexcept(noexcept(_LIBCPP_AUTO_CAST(begin(__t))))
{
return _LIBCPP_AUTO_CAST(begin(__t));
}
void operator()(auto&&) const = delete;
};
} // namespace __begin
inline namespace __cpo {
inline constexpr auto begin = __begin::__fn{};
} // namespace __cpo
} // namespace ranges
// [range.range]
namespace ranges {
template <class _Tp>
using iterator_t = decltype(ranges::begin(declval<_Tp&>()));
} // namespace ranges
// [range.access.end]
namespace ranges {
namespace __end {
template <class _Tp>
concept __member_end =
__can_borrow<_Tp> &&
__workaround_52970<_Tp> &&
requires(_Tp&& __t) {
typename iterator_t<_Tp>;
{ _LIBCPP_AUTO_CAST(__t.end()) } -> sentinel_for<iterator_t<_Tp>>;
};
void end(auto&) = delete;
void end(const auto&) = delete;
template <class _Tp>
concept __unqualified_end =
!__member_end<_Tp> &&
__can_borrow<_Tp> &&
__class_or_enum<remove_cvref_t<_Tp>> &&
requires(_Tp && __t) {
typename iterator_t<_Tp>;
{ _LIBCPP_AUTO_CAST(end(__t)) } -> sentinel_for<iterator_t<_Tp>>;
};
struct __fn {
template <class _Tp, size_t _Np>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp (&__t)[_Np]) const noexcept
requires (sizeof(_Tp) >= 0) // Disallow incomplete element types.
{
return __t + _Np;
}
template <class _Tp>
requires __member_end<_Tp>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
noexcept(noexcept(_LIBCPP_AUTO_CAST(__t.end())))
{
return _LIBCPP_AUTO_CAST(__t.end());
}
template <class _Tp>
requires __unqualified_end<_Tp>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
noexcept(noexcept(_LIBCPP_AUTO_CAST(end(__t))))
{
return _LIBCPP_AUTO_CAST(end(__t));
}
void operator()(auto&&) const = delete;
};
} // namespace __end
inline namespace __cpo {
inline constexpr auto end = __end::__fn{};
} // namespace __cpo
} // namespace ranges
// [range.access.cbegin]
namespace ranges {
namespace __cbegin {
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::begin(static_cast<const remove_reference_t<_Tp>&>(__t))))
-> decltype( ranges::begin(static_cast<const remove_reference_t<_Tp>&>(__t)))
{ return ranges::begin(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::begin(static_cast<const _Tp&&>(__t))))
-> decltype( ranges::begin(static_cast<const _Tp&&>(__t)))
{ return ranges::begin(static_cast<const _Tp&&>(__t)); }
};
} // namespace __cbegin
inline namespace __cpo {
inline constexpr auto cbegin = __cbegin::__fn{};
} // namespace __cpo
} // namespace ranges
// [range.access.cend]
namespace ranges {
namespace __cend {
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::end(static_cast<const remove_reference_t<_Tp>&>(__t))))
-> decltype( ranges::end(static_cast<const remove_reference_t<_Tp>&>(__t)))
{ return ranges::end(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::end(static_cast<const _Tp&&>(__t))))
-> decltype( ranges::end(static_cast<const _Tp&&>(__t)))
{ return ranges::end(static_cast<const _Tp&&>(__t)); }
};
} // namespace __cend
inline namespace __cpo {
inline constexpr auto cend = __cend::__fn{};
} // namespace __cpo
} // namespace ranges
#endif // _LIBCPP_STD_VER > 17
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___RANGES_ACCESS_H
|
