| 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 explicit elements_view(V base); |
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| 12 | |
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| 13 | #include <cassert> |
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| 14 | #include <ranges> |
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| 15 | #include <tuple> |
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| 16 | #include <type_traits> |
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| 17 | #include <utility> |
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| 18 | |
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| 19 | #include "MoveOnly.h" |
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| 20 | |
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| 21 | struct View : std::ranges::view_base { |
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| 22 | MoveOnly mo; |
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| 23 | std::tuple<int>* begin() const; |
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| 24 | std::tuple<int>* end() const; |
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| 25 | }; |
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| 26 | |
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| 27 | // Test Explicit |
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| 28 | static_assert(std::is_constructible_v<std::ranges::elements_view<View, 0>, View>); |
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| 29 | static_assert(!std::is_convertible_v<View, std::ranges::elements_view<View, 0>>); |
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| 30 | |
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| 31 | constexpr bool test() { |
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| 32 | { |
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| 33 | std::ranges::elements_view<View, 0> ev{View{{}, MoveOnly{5}}}; |
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| 34 | assert(std::move(ev).base().mo.get() == 5); |
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| 35 | } |
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| 36 | |
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| 37 | return true; |
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| 38 | } |
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| 39 | |
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| 40 | int main(int, char**) { |
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| 41 | test(); |
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| 42 | static_assert(test()); |
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| 43 | return 0; |
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| 44 | } |
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| 45 | |
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