| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // UNSUPPORTED: c++03, c++11 |
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| 10 | // <experimental/type_traits> |
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| 11 | |
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| 12 | #include <experimental/type_traits> |
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| 13 | #include <string> |
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| 14 | |
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| 15 | #include "test_macros.h" |
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| 16 | |
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| 17 | namespace ex = std::experimental; |
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| 18 | |
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| 19 | template <typename T> |
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| 20 | using hasFoo = typename T::Foo; |
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| 21 | |
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| 22 | struct yesFoo { |
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| 23 | using Foo = int; |
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| 24 | }; |
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| 25 | |
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| 26 | struct noFoo { |
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| 27 | }; |
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| 28 | |
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| 29 | |
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| 30 | template <typename T, typename Res> |
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| 31 | void test() { |
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| 32 | static_assert( std::is_same<Res, typename ex::detected_or <double, hasFoo, T>::type>::value, "" ); |
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| 33 | static_assert( std::is_same<Res, typename ex::detected_or_t<double, hasFoo, T> >::value, "" ); |
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| 34 | } |
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| 35 | |
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| 36 | int main(int, char**) { |
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| 37 | test<yesFoo, int>(); |
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| 38 | test<noFoo, double>(); |
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| 39 | |
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| 40 | return 0; |
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| 41 | } |
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| 42 | |
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