| 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 | // constexpr auto size() requires sized_range<V> |
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| 12 | // constexpr auto size() const requires sized_range<const V> |
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| 13 | |
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| 14 | #include <ranges> |
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| 15 | |
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| 16 | #include "test_macros.h" |
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| 17 | #include "types.h" |
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| 18 | |
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| 19 | template<class T> |
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| 20 | concept SizeInvocable = requires(T t) { t.size(); }; |
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| 21 | |
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| 22 | constexpr bool test() { |
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| 23 | { |
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| 24 | std::ranges::transform_view transformView(MoveOnlyView{}, PlusOne{}); |
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| 25 | assert(transformView.size() == 8); |
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| 26 | } |
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| 27 | |
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| 28 | { |
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| 29 | const std::ranges::transform_view transformView(MoveOnlyView{globalBuff, 4}, PlusOne{}); |
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| 30 | assert(transformView.size() == 4); |
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| 31 | } |
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| 32 | |
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| 33 | static_assert(!SizeInvocable<std::ranges::transform_view<ForwardView, PlusOne>>); |
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| 34 | |
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| 35 | static_assert(SizeInvocable<std::ranges::transform_view<SizedSentinelNotConstView, PlusOne>>); |
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| 36 | static_assert(!SizeInvocable<const std::ranges::transform_view<SizedSentinelNotConstView, PlusOne>>); |
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| 37 | |
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| 38 | return true; |
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| 39 | } |
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| 40 | |
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| 41 | int main(int, char**) { |
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| 42 | test(); |
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| 43 | static_assert(test()); |
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| 44 | |
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| 45 | return 0; |
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| 46 | } |
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| 47 | |
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