Differential D100278 Diff 342544 libcxx/test/std/ranges/range.refinements/bidirectional_range.compile.pass.cpp

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libcxx/test/std/ranges/range.refinements/bidirectional_range.compile.pass.cpp

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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

				// template<range _Rp>
				// 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>());