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// -*- C++ -*-
//===------------------------ __ranges/access.h ---------------------------===//
//
// 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 <__config>
#include <__iterator/concepts.h>
#include <__iterator/readable_traits.h>
#include <__ranges/enable_borrowed_range.h>
#include <__utility/as_const.h>
#include <__utility/decay_copy.h>
#include <__utility/forward.h>
#include <concepts>
#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_RANGES)
// clang-format off
namespace ranges {
template <class _Tp>
concept __can_borrow =
is_lvalue_reference_v<_Tp> || enable_borrowed_range<remove_cvref_t<_Tp> >;
template<class _Tp>
concept __is_complete = requires { sizeof(_Tp); };
} // namespace ranges
// [range.access.begin]
namespace ranges::__begin {
template <class _Tp>
concept __member_begin =
__can_borrow<_Tp> &&
requires(_Tp&& __t) {
{ _VSTD::__decay_copy(__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) {
{ _VSTD::__decay_copy(begin(__t)) } -> input_or_output_iterator;
};
struct __fn {
template <class _Tp>
requires is_array_v<remove_cv_t<_Tp>>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp& __t) const noexcept {
constexpr bool __complete = __is_complete<iter_value_t<_Tp> >;
if constexpr (__complete) { // used to disable cryptic diagnostic
return __t + 0;
}
else {
static_assert(__complete, "`std::ranges::begin` is SFINAE-unfriendly on arrays of an incomplete type.");
}
}
template <class _Tp>
requires __member_begin<_Tp>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
noexcept(noexcept(_VSTD::__decay_copy(__t.begin())))
{
return __t.begin();
}
template <class _Tp>
requires __unqualified_begin<_Tp>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
noexcept(noexcept(_VSTD::__decay_copy(begin(__t))))
{
return begin(__t);
}
void operator()(auto&&) const = delete;
};
} // namespace ranges::__begin
namespace ranges {
inline namespace __cpo {
inline constexpr auto begin = __begin::__fn{};
} // namespace __cpo
template <class _Tp>
using iterator_t = decltype(ranges::begin(declval<_Tp&>()));
} // namespace ranges
// [range.access.end]
namespace ranges::__end {
template <class _Tp>
concept __member_end =
__can_borrow<_Tp> &&
requires(_Tp&& __t) {
typename iterator_t<_Tp>;
{ _VSTD::__decay_copy(_VSTD::forward<_Tp>(__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>;
{ _VSTD::__decay_copy(end(_VSTD::forward<_Tp>(__t))) } -> sentinel_for<iterator_t<_Tp> >;
};
class __fn {
public:
template <class _Tp, size_t _Np>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp (&__t)[_Np]) const noexcept {
constexpr bool __complete = __is_complete<remove_cv_t<_Tp> >;
if constexpr (__complete) { // used to disable cryptic diagnostic
return __t + _Np;
}
else {
static_assert(__complete, "`std::ranges::end` is SFINAE-unfriendly on arrays of an incomplete type.");
}
}
template <class _Tp>
requires __member_end<_Tp>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
noexcept(noexcept(_VSTD::__decay_copy(__t.end())))
{
return _VSTD::forward<_Tp>(__t).end();
}
template <class _Tp>
requires __unqualified_end<_Tp>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
noexcept(noexcept(_VSTD::__decay_copy(end(__t))))
{
return end(__t);
}
void operator()(auto&&) const = delete;
};
} // namespace ranges::__end
namespace ranges::inline __cpo {
inline constexpr auto end = __end::__fn{};
} // namespace ranges::__cpo
namespace ranges::__cbegin {
struct __fn {
template <class _Tp>
requires invocable<decltype(ranges::begin), _Tp const&>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp& __t) const
noexcept(noexcept(ranges::begin(_VSTD::as_const(__t))))
{
return ranges::begin(_VSTD::as_const(__t));
}
template <class _Tp>
requires is_rvalue_reference_v<_Tp> && invocable<decltype(ranges::begin), _Tp const&&>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
noexcept(noexcept(ranges::begin(static_cast<_Tp const&&>(__t))))
{
return ranges::begin(static_cast<_Tp const&&>(__t));
}
};
} // namespace ranges::__cbegin
namespace ranges::inline __cpo {
inline constexpr auto cbegin = __cbegin::__fn{};
} // namespace ranges::__cpo
namespace ranges::__cend {
struct __fn {
template <class _Tp>
requires invocable<decltype(ranges::end), _Tp const&>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp& __t) const
noexcept(noexcept(ranges::end(_VSTD::as_const(__t))))
{
return ranges::end(_VSTD::as_const(__t));
}
template <class _Tp>
requires is_rvalue_reference_v<_Tp> && invocable<decltype(ranges::end), _Tp const&&>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
noexcept(noexcept(ranges::end(static_cast<_Tp const&&>(__t))))
{
return ranges::end(static_cast<_Tp const&&>(__t));
}
};
} // namespace ranges::__cend
namespace ranges::inline __cpo {
inline constexpr auto cend = __cend::__fn{};
} // namespace ranges::__cpo
// clang-format off
#endif // !defined(_LIBCPP_HAS_NO_RANGES)
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___RANGES_ACCESS_H
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