50 lines
1.1 KiB
C++
50 lines
1.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11
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// <experimental/type_traits>
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#include <experimental/type_traits>
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#include <string>
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#include "test_macros.h"
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namespace ex = std::experimental;
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template <typename T>
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using callFoo = decltype(std::declval<T&>().Foo());
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struct yesFoo {
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int Foo() { return 0; }
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};
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struct noFoo {
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};
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struct wrongFoo {
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std::string Foo() { return ""; }
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};
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struct convertibleFoo {
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long Foo() { return 0; }
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};
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template <typename T, typename Res>
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void test() {
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static_assert( std::is_same<Res, typename ex::detected_t<callFoo, T>>::value, "" );
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}
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int main(int, char**) {
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test<yesFoo, int>();
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test<noFoo, ex::nonesuch>(); // lookup failure returns nonesuch
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test<wrongFoo, std::string>();
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return 0;
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}
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