| // PR c++/51989 | |
| // { dg-do compile { target c++11 } } | |
| template <typename T> | |
| struct is_container | |
| { | |
| template <typename U, typename V = decltype(((U*)0)->begin())> | |
| static char test(U* u); | |
| template <typename U> static long test(...); | |
| enum { value = sizeof test<T>(0) == 1 }; | |
| }; | |
| int main() | |
| { | |
| return is_container<void>::value; | |
| } |