1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // UNSUPPORTED: c++03, c++11, c++14, c++17
10 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
11 
12 // __non_propagating_cache();
13 
14 #include <ranges>
15 
16 #include <cassert>
17 #include <type_traits>
18 
19 struct HasDefault { HasDefault() = default; };
20 struct NoDefault { NoDefault() = delete; };
21 
22 template <class T>
test()23 constexpr void test() {
24   using Cache = std::ranges::__non_propagating_cache<T>;
25   static_assert(std::is_nothrow_default_constructible_v<Cache>);
26   Cache cache;
27   assert(!cache.__has_value());
28 }
29 
tests()30 constexpr bool tests() {
31   test<HasDefault>();
32   test<NoDefault>();
33   test<int>();
34   test<char*>();
35   return true;
36 }
37 
main(int,char **)38 int main(int, char**) {
39   static_assert(tests());
40   tests();
41   return 0;
42 }
43