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
10 // <experimental/type_traits>
11
12 #include <experimental/type_traits>
13 #include <string>
14
15 #include "test_macros.h"
16
17 namespace ex = std::experimental;
18
19 template <typename T>
20 using hasFoo = typename T::Foo;
21
22 struct yesFoo {
23 using Foo = int;
24 };
25
26 struct noFoo {
27 };
28
29
30 template <typename T, typename Res>
test()31 void test() {
32 static_assert( std::is_same<Res, typename ex::detected_or <double, hasFoo, T>::type>::value, "" );
33 static_assert( std::is_same<Res, typename ex::detected_or_t<double, hasFoo, T> >::value, "" );
34 }
35
main(int,char **)36 int main(int, char**) {
37 test<yesFoo, int>();
38 test<noFoo, double>();
39
40 return 0;
41 }
42