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-no-concepts
11 // UNSUPPORTED: gcc-10
12 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
13 
14 // __non_propagating_cache();
15 
16 #include <ranges>
17 
18 #include <cassert>
19 #include <type_traits>
20 
21 struct HasDefault { HasDefault() = default; };
22 struct NoDefault { NoDefault() = delete; };
23 
24 template <class T>
25 constexpr void test() {
26   using Cache = std::ranges::__non_propagating_cache<T>;
27   static_assert(std::is_nothrow_default_constructible_v<Cache>);
28   Cache cache;
29   assert(!cache.__has_value());
30 }
31 
32 constexpr bool tests() {
33   test<HasDefault>();
34   test<NoDefault>();
35   test<int>();
36   test<char*>();
37   return true;
38 }
39 
40 int main(int, char**) {
41   static_assert(tests());
42   tests();
43   return 0;
44 }
45