| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // UNSUPPORTED: c++03, c++11, c++14, c++17 |
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| 10 | |
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| 11 | // template<class R> |
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| 12 | // concept bidirectional_range; |
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| 13 | |
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| 14 | #include <ranges> |
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| 15 | |
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| 16 | #include "test_range.h" |
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| 17 | |
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| 18 | template <template <class...> class I> |
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| 19 | constexpr bool check_bidirectional_range() { |
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| 20 | constexpr bool result = std::ranges::bidirectional_range<test_range<I> >; |
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| 21 | static_assert(std::ranges::bidirectional_range<test_range<I> const> == result); |
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| 22 | static_assert(std::ranges::bidirectional_range<test_non_const_common_range<I> > == result); |
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| 23 | static_assert(std::ranges::bidirectional_range<test_non_const_range<I> > == result); |
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| 24 | static_assert(std::ranges::bidirectional_range<test_common_range<I> > == result); |
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| 25 | static_assert(std::ranges::bidirectional_range<test_common_range<I> const> == result); |
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| 26 | static_assert(!std::ranges::bidirectional_range<test_non_const_common_range<I> const>); |
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| 27 | static_assert(!std::ranges::bidirectional_range<test_non_const_range<I> const>); |
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| 28 | return result; |
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| 29 | } |
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| 30 | |
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| 31 | static_assert(!check_bidirectional_range<cpp17_input_iterator>()); |
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| 32 | static_assert(!check_bidirectional_range<cpp20_input_iterator>()); |
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| 33 | static_assert(!check_bidirectional_range<forward_iterator>()); |
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| 34 | static_assert(check_bidirectional_range<bidirectional_iterator>()); |
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| 35 | static_assert(check_bidirectional_range<random_access_iterator>()); |
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| 36 | static_assert(check_bidirectional_range<contiguous_iterator>()); |
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| 37 | |
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| 38 | // Test ADL-proofing. |
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| 39 | struct Incomplete; |
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| 40 | template<class T> struct Holder { T t; }; |
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| 41 | |
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| 42 | static_assert(!std::ranges::bidirectional_range<Holder<Incomplete>*>); |
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| 43 | static_assert(!std::ranges::bidirectional_range<Holder<Incomplete>*&>); |
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| 44 | static_assert(!std::ranges::bidirectional_range<Holder<Incomplete>*&&>); |
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| 45 | static_assert(!std::ranges::bidirectional_range<Holder<Incomplete>* const>); |
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| 46 | static_assert(!std::ranges::bidirectional_range<Holder<Incomplete>* const&>); |
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| 47 | static_assert(!std::ranges::bidirectional_range<Holder<Incomplete>* const&&>); |
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| 48 | |
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| 49 | static_assert( std::ranges::bidirectional_range<Holder<Incomplete>*[10]>); |
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| 50 | static_assert( std::ranges::bidirectional_range<Holder<Incomplete>*(&)[10]>); |
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| 51 | static_assert( std::ranges::bidirectional_range<Holder<Incomplete>*(&&)[10]>); |
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| 52 | static_assert( std::ranges::bidirectional_range<Holder<Incomplete>* const[10]>); |
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| 53 | static_assert( std::ranges::bidirectional_range<Holder<Incomplete>* const(&)[10]>); |
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| 54 | static_assert( std::ranges::bidirectional_range<Holder<Incomplete>* const(&&)[10]>); |
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| 55 | |
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