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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: libcpp-no-concepts
// UNSUPPORTED: gcc-10
// UNSUPPORTED: libcpp-has-no-incomplete-ranges
// template<class R>
// concept bidirectional_range;
#include <ranges>
#include "test_range.h"
namespace stdr = std::ranges;
template <template <class...> class I>
constexpr bool check_bidirectional_range() {
constexpr bool result = stdr::bidirectional_range<test_range<I> >;
static_assert(stdr::bidirectional_range<test_range<I> const> == result);
static_assert(stdr::bidirectional_range<test_non_const_common_range<I> > == result);
static_assert(stdr::bidirectional_range<test_non_const_range<I> > == result);
static_assert(stdr::bidirectional_range<test_common_range<I> > == result);
static_assert(stdr::bidirectional_range<test_common_range<I> const> == result);
static_assert(!stdr::bidirectional_range<test_non_const_common_range<I> const>);
static_assert(!stdr::bidirectional_range<test_non_const_range<I> const>);
return result;
}
static_assert(!check_bidirectional_range<cpp17_input_iterator>());
static_assert(!check_bidirectional_range<cpp20_input_iterator>());
static_assert(!check_bidirectional_range<forward_iterator>());
static_assert(check_bidirectional_range<bidirectional_iterator>());
static_assert(check_bidirectional_range<random_access_iterator>());
static_assert(check_bidirectional_range<contiguous_iterator>());
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