| // PR c++/78489 |
| // { dg-do compile { target c++11 } } |
| |
| template <bool P, class T = void> struct enable_if { using type = T; }; |
| template <class T> struct enable_if<false, T> {}; |
| |
| template <class Dummy> struct use_type { using type = int; }; |
| |
| template <bool Pred> |
| struct get_type { |
| static_assert(Pred, ""); |
| using type = int; |
| }; |
| |
| template <bool Val, |
| class = typename enable_if<Val>::type, // Evaluation/Substitution should end here |
| class ValT = typename get_type<Val>::type, // This should not be instantiated |
| typename use_type<ValT>::type = 0 // This NTTP causes ValT to be required |
| > |
| constexpr bool test(int) { return false; } |
| |
| template <bool> |
| constexpr bool test(long) { return true; } |
| |
| static_assert(test<false>(0), ""); // should call test(long) |
