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 // template<class T>
13 //  requires is_object_v<T>
14 // class non-propagating-cache;
15 
16 #include <ranges>
17 
18 template<template<class...> class T, class ...Args>
19 concept well_formed = requires {
20   typename T<Args...>;
21 };
22 
23 struct T { };
24 static_assert( well_formed<std::ranges::__non_propagating_cache, int>);
25 static_assert( well_formed<std::ranges::__non_propagating_cache, T>);
26 static_assert( well_formed<std::ranges::__non_propagating_cache, void (*)()>);
27 static_assert(!well_formed<std::ranges::__non_propagating_cache, void>);
28 static_assert(!well_formed<std::ranges::__non_propagating_cache, T&>);
29 static_assert(!well_formed<std::ranges::__non_propagating_cache, void()>);
30