| 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 | // <ranges> |
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| 12 | // |
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| 13 | // Range adaptors that take predicates should support predicates that return a non-boolean |
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| 14 | // value as long as the returned type is implicitly convertible to bool. |
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| 15 | |
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| 16 | #include <ranges> |
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| 17 | |
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| 18 | #include "boolean_testable.h" |
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| 19 | |
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| 20 | template <std::ranges::view View> |
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| 21 | constexpr void use(View view) { |
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| 22 | // Just use the view in a few ways. Our goal here is to trigger the instantiation |
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| 23 | // of various functions related to the view and its iterators in the hopes that we |
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| 24 | // instantiate functions that might have incorrect implementations w.r.t. predicates. |
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| 25 | auto first = std::ranges::begin(view); |
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| 26 | auto last = std::ranges::end(view); |
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| 27 | ++first; |
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| 28 | --first; |
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| 29 | (void)(first == last); |
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| 30 | (void)(first != last); |
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| 31 | (void)std::ranges::empty(view); |
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| 32 | } |
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| 33 | |
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| 34 | using Value = StrictComparable<int>; |
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| 35 | using Iterator = StrictBooleanIterator<Value*>; |
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| 36 | using Range = std::ranges::subrange<Iterator>; |
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| 37 | auto pred1 = StrictUnaryPredicate; |
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| 38 | auto pred2 = StrictBinaryPredicate; |
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| 39 | |
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| 40 | void f(Range in) { |
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| 41 | (void)pred1; |
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| 42 | (void)pred2; |
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| 43 | |
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| 44 | #if TEST_STD_VER >= 23 |
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| 45 | { |
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| 46 | auto view = std::views::chunk_by(in, pred2); |
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| 47 | use(view); |
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| 48 | } |
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| 49 | #endif |
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| 50 | { |
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| 51 | auto view = std::views::drop_while(in, pred1); |
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| 52 | use(view); |
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| 53 | } |
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| 54 | { |
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| 55 | auto view = std::views::filter(in, pred1); |
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| 56 | use(view); |
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| 57 | } |
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| 58 | { |
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| 59 | auto view = std::views::take_while(in, pred1); |
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| 60 | use(view); |
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| 61 | } |
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| 62 | } |
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| 63 | |
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