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// -*- C++ -*-
//===--------------------- __ranges/concepts.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_CONCEPTS_H
#define _LIBCPP___RANGES_CONCEPTS_H
#include <__config>
#include <__iterator/concepts.h>
#include <__ranges/access.h>
#include <__ranges/size.h>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
// clang-format off
#if !defined(_LIBCPP_HAS_NO_RANGES)
namespace ranges {
// [range.range]
template <class _Tp>
concept range = requires(_Tp& __t) {
ranges::begin(__t); // sometimes equality-preserving
ranges::end(__t);
};
template<class _Range>
concept borrowed_range = range<_Range> &&
(is_lvalue_reference_v<_Range> || enable_borrowed_range<remove_cvref_t<_Range>>);
// `iterator_t` defined in <__ranges/access.h>
template <range _Rp>
using sentinel_t = decltype(ranges::end(declval<_Rp&>()));
template <range _Rp>
using range_difference_t = iter_difference_t<iterator_t<_Rp> >;
template <range _Rp>
using range_value_t = iter_value_t<iterator_t<_Rp> >;
template <range _Rp>
using range_reference_t = iter_reference_t<iterator_t<_Rp> >;
template <range _Rp>
using range_rvalue_reference_t = iter_rvalue_reference_t<iterator_t<_Rp> >;
// [range.sized]
template <class _Tp>
concept sized_range = range<_Tp> && requires(_Tp& __t) { ranges::size(__t); };
// `disable_sized_range` defined in `<__ranges/size.h>`
// [range.refinements], other range refinements
template <class _Tp>
concept input_range = range<_Tp> && input_iterator<iterator_t<_Tp> >;
template <class _Tp>
concept forward_range = input_range<_Tp> && forward_iterator<iterator_t<_Tp> >;
template <class _Tp>
concept bidirectional_range = forward_range<_Tp> && bidirectional_iterator<iterator_t<_Tp> >;
template <class _Tp>
concept random_access_range =
bidirectional_range<_Tp> && random_access_iterator<iterator_t<_Tp> >;
template <class _Tp>
concept common_range = range<_Tp> && same_as<iterator_t<_Tp>, sentinel_t<_Tp> >;
} // namespace ranges
#endif // !defined(_LIBCPP_HAS_NO_RANGES)
// clang-format on
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___RANGES_CONCEPTS_H