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view gcc/testsuite/g++.dg/cpp0x/sfinae53.C @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
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// PR c++/59204 // { dg-do compile { target c++11 } } template< class T > using void_t = void; template< class T, class = void > struct has_type { constexpr static bool value = false; }; template< class T > struct has_type<T, void_t<typename T::type>> { constexpr static bool value = true; }; struct yes { using type = int; }; struct no { }; int main( ) { static_assert( has_type<yes>::value, "false negative!" ); static_assert( not has_type<no >::value, "false positive!" ); }