Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/cpp0x/sfinae53.C @ 158:494b0b89df80 default tip
...
author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
---|---|
date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 04ced10e8804 |
children |
line wrap: on
line source
// 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!" ); }