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//===----------------------------------------------------------------------===//
//
// 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: gcc-10
// 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;
}
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