| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // UNSUPPORTED: libcpp-no-concepts |
| // UNSUPPORTED: libcpp-has-no-incomplete-ranges |
| |
| // std::ranges::dangling; |
| |
| #include <ranges> |
| |
| #include <concepts> |
| #include <type_traits> |
| |
| static_assert(std::is_empty_v<std::ranges::dangling>); |
| |
| template<int> struct S { }; |
| static_assert(std::is_nothrow_constructible_v<std::ranges::dangling>); |
| static_assert(std::is_nothrow_constructible_v<std::ranges::dangling, S<0>>); |
| static_assert(std::is_nothrow_constructible_v<std::ranges::dangling, S<0>, S<1>>); |
| static_assert(std::is_nothrow_constructible_v<std::ranges::dangling, S<0>, S<1>, S<2>>); |
| |
| constexpr bool test_dangling() { |
| [[maybe_unused]] auto a = std::ranges::dangling(); |
| [[maybe_unused]] auto b = std::ranges::dangling(S<0>()); |
| [[maybe_unused]] auto c = std::ranges::dangling(S<0>(), S<1>()); |
| [[maybe_unused]] auto d = std::ranges::dangling(S<0>(), S<1>(), S<2>()); |
| return true; |
| } |
| |
| int main(int, char**) { |
| static_assert(test_dangling()); |
| test_dangling(); |
| return 0; |
| } |