| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| |
| // constexpr explicit sentinel(sentinel_t<Base> end); |
| |
| #include <cassert> |
| #include <ranges> |
| #include <tuple> |
| #include <utility> |
| |
| struct Sent { |
| int i; |
| |
| friend constexpr bool operator==(std::tuple<int>*, const Sent&) { return true; } |
| }; |
| |
| struct Range : std::ranges::view_base { |
| std::tuple<int>* begin() const; |
| Sent end(); |
| }; |
| |
| // Test explicit |
| |
| static_assert(std::is_constructible_v<std::ranges::sentinel_t<std::ranges::elements_view<Range, 0>>, Sent>); |
| static_assert(!std::is_convertible_v<Sent, std::ranges::sentinel_t<std::ranges::elements_view<Range, 0>>>); |
| |
| constexpr bool test() { |
| // base is init correctly |
| { |
| using R = std::ranges::elements_view<Range, 0>; |
| using Sentinel = std::ranges::sentinel_t<R>; |
| |
| Sentinel s1(Sent{5}); |
| assert(s1.base().i == 5); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |