1 // PR c++/51989 2 // { dg-do compile { target c++11 } } 3 4 template <typename T> 5 struct is_container 6 { 7 template <typename U, typename V = decltype(((U*)0)->begin())> 8 static char test(U* u); 9 10 template <typename U> static long test(...); 11 12 enum { value = sizeof test<T>(0) == 1 }; 13 }; 14 main()15int main() 16 { 17 return is_container<void>::value; 18 } 19