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view gcc/testsuite/g++.dg/cpp2a/concepts-pr80471.C @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
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date | Thu, 13 Feb 2020 11:34:05 +0900 |
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// PR c++/80471 // { dg-do compile { target c++14 } } // { dg-additional-options "-fconcepts" } template <class, class> constexpr bool is_same = false; template <class T> constexpr bool is_same<T, T> = true; template<class T> decltype(auto) f(T&& a){return a;} decltype(auto) g(auto&& a){return a;} auto z = [](auto&& a) -> decltype(auto) { return a; }; int main() { int i; static_assert(is_same< decltype(f(i)), int& >, ""); static_assert(is_same< decltype(g(i)), int& >, ""); static_assert(is_same< decltype(z(i)), int& >, ""); }