| //===----------------------------------------------------------------------===// |
| // |
| // 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++98, c++03, c++11 |
| // <experimental/type_traits> |
| |
| #include <experimental/type_traits> |
| #include <string> |
| |
| #include "test_macros.h" |
| |
| namespace ex = std::experimental; |
| |
| template <typename T> |
| using hasFoo = typename T::Foo; |
| |
| struct yesFoo { |
| using Foo = int; |
| }; |
| |
| struct noFoo { |
| }; |
| |
| |
| template <typename T, typename Res> |
| void test() { |
| static_assert( std::is_same<Res, typename ex::detected_or <double, hasFoo, T>::type>::value, "" ); |
| static_assert( std::is_same<Res, typename ex::detected_or_t<double, hasFoo, T> >::value, "" ); |
| } |
| |
| int main(int, char**) { |
| test<yesFoo, int>(); |
| test<noFoo, double>(); |
| |
| return 0; |
| } |