41 lines
1.7 KiB
C++
41 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// UNSUPPORTED: libcpp-no-concepts
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// UNSUPPORTED: libcpp-has-no-incomplete-ranges
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// template<class R>
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// concept bidirectional_range;
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#include <ranges>
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#include "test_range.h"
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namespace stdr = std::ranges;
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template <template <class...> class I>
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constexpr bool check_bidirectional_range() {
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constexpr bool result = stdr::bidirectional_range<test_range<I> >;
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static_assert(stdr::bidirectional_range<test_range<I> const> == result);
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static_assert(stdr::bidirectional_range<test_non_const_common_range<I> > == result);
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static_assert(stdr::bidirectional_range<test_non_const_range<I> > == result);
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static_assert(stdr::bidirectional_range<test_common_range<I> > == result);
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static_assert(stdr::bidirectional_range<test_common_range<I> const> == result);
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static_assert(!stdr::bidirectional_range<test_non_const_common_range<I> const>);
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static_assert(!stdr::bidirectional_range<test_non_const_range<I> const>);
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return result;
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}
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static_assert(!check_bidirectional_range<cpp17_input_iterator>());
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static_assert(!check_bidirectional_range<cpp20_input_iterator>());
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static_assert(!check_bidirectional_range<forward_iterator>());
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static_assert(check_bidirectional_range<bidirectional_iterator>());
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static_assert(check_bidirectional_range<random_access_iterator>());
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static_assert(check_bidirectional_range<contiguous_iterator>());
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