| 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, c++20 |
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| 10 | |
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| 11 | // <ranges> |
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| 12 | |
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| 13 | // Check constraints on the type itself. |
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| 14 | // |
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| 15 | // template <forward_range View, indirect_binary_predicate<iterator_t<View>, iterator_t<View>> Pred> |
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| 16 | // requires view<View> && is_object_v<Pred> |
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| 17 | // class chunk_by_view; |
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| 18 | |
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| 19 | #include <ranges> |
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| 20 | |
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| 21 | #include <concepts> |
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| 22 | #include <cstddef> |
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| 23 | #include <iterator> |
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| 24 | #include <type_traits> |
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| 25 | |
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| 26 | #include "almost_satisfies_types.h" |
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| 27 | #include "test_iterators.h" |
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| 28 | |
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| 29 | template <class View, class Pred> |
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| 30 | concept CanFormChunkByView = requires { typename std::ranges::chunk_by_view<View, Pred>; }; |
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| 31 | |
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| 32 | // chunk_by_view is not valid when the view is not a forward_range |
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| 33 | namespace test_when_view_is_not_a_forward_range { |
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| 34 | |
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| 35 | struct View : std::ranges::view_base { |
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| 36 | ForwardIteratorNotDerivedFrom begin() const; |
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| 37 | ForwardIteratorNotDerivedFrom end() const; |
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| 38 | }; |
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| 39 | struct Pred { |
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| 40 | bool operator()(int, int) const; |
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| 41 | }; |
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| 42 | |
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| 43 | static_assert(!std::ranges::forward_range<View>); |
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| 44 | static_assert(std::indirect_binary_predicate<Pred, int*, int*>); |
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| 45 | static_assert(std::ranges::view<View>); |
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| 46 | static_assert(std::is_object_v<Pred>); |
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| 47 | static_assert(!CanFormChunkByView<View, Pred>); |
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| 48 | |
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| 49 | } // namespace test_when_view_is_not_a_forward_range |
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| 50 | |
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| 51 | // chunk_by_view is not valid when the predicate is not indirect_binary_predicate |
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| 52 | namespace test_when_the_predicate_is_not_indirect_binary_predicate { |
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| 53 | |
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| 54 | struct View : std::ranges::view_base { |
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| 55 | int* begin() const; |
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| 56 | int* end() const; |
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| 57 | }; |
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| 58 | struct Pred {}; |
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| 59 | |
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| 60 | static_assert(std::ranges::forward_range<View>); |
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| 61 | static_assert(!std::indirect_binary_predicate<Pred, int*, int*>); |
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| 62 | static_assert(std::ranges::view<View>); |
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| 63 | static_assert(std::is_object_v<Pred>); |
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| 64 | static_assert(!CanFormChunkByView<View, Pred>); |
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| 65 | |
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| 66 | } // namespace test_when_the_predicate_is_not_indirect_binary_predicate |
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| 67 | |
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| 68 | // chunk_by_view is not valid when the view is not a view |
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| 69 | namespace test_when_the_view_param_is_not_a_view { |
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| 70 | |
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| 71 | struct View { |
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| 72 | int* begin() const; |
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| 73 | int* end() const; |
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| 74 | }; |
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| 75 | struct Pred { |
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| 76 | bool operator()(int, int) const; |
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| 77 | }; |
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| 78 | |
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| 79 | static_assert(std::ranges::input_range<View>); |
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| 80 | static_assert(std::indirect_binary_predicate<Pred, int*, int*>); |
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| 81 | static_assert(!std::ranges::view<View>); |
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| 82 | static_assert(std::is_object_v<Pred>); |
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| 83 | static_assert(!CanFormChunkByView<View, Pred>); |
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| 84 | |
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| 85 | } // namespace test_when_the_view_param_is_not_a_view |
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| 86 | |
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| 87 | // chunk_by_view is not valid when the predicate is not an object type |
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| 88 | namespace test_when_the_predicate_is_not_an_object_type { |
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| 89 | |
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| 90 | struct View : std::ranges::view_base { |
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| 91 | int* begin() const; |
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| 92 | int* end() const; |
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| 93 | }; |
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| 94 | using Pred = bool (&)(int, int); |
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| 95 | |
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| 96 | static_assert(std::ranges::input_range<View>); |
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| 97 | static_assert(std::indirect_binary_predicate<Pred, int*, int*>); |
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| 98 | static_assert(std::ranges::view<View>); |
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| 99 | static_assert(!std::is_object_v<Pred>); |
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| 100 | static_assert(!CanFormChunkByView<View, Pred>); |
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| 101 | |
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| 102 | } // namespace test_when_the_predicate_is_not_an_object_type |
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| 103 | |
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| 104 | // chunk_by_view is valid when all the constraints are satisfied (test the test) |
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| 105 | namespace test_when_all_the_constraints_are_satisfied { |
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| 106 | |
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| 107 | struct View : std::ranges::view_base { |
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| 108 | int* begin() const; |
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| 109 | int* end() const; |
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| 110 | }; |
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| 111 | struct Pred { |
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| 112 | bool operator()(int, int) const; |
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| 113 | }; |
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| 114 | |
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| 115 | static_assert(std::ranges::input_range<View>); |
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| 116 | static_assert(std::indirect_binary_predicate<Pred, int*, int*>); |
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| 117 | static_assert(std::ranges::view<View>); |
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| 118 | static_assert(std::is_object_v<Pred>); |
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| 119 | static_assert(CanFormChunkByView<View, Pred>); |
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| 120 | |
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| 121 | } // namespace test_when_all_the_constraints_are_satisfied |
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| 122 | |
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