| // PR c++/48557 | |
| // { dg-do compile { target c++11 } } | |
| template<class T> | |
| struct add_rval_ref | |
| { | |
| typedef T&& type; | |
| }; | |
| template<> | |
| struct add_rval_ref<void> | |
| { | |
| typedef void type; | |
| }; | |
| template<class T> | |
| typename add_rval_ref<T>::type create(); | |
| template<class T, class U, | |
| class = decltype(create<T>() + create<U>()) | |
| > | |
| char f(int); | |
| template<class, class> | |
| char (&f(...))[2]; | |
| static_assert(sizeof(f<void, int>(0)) != 1, "Error"); // (a) |