| // { dg-do run } |
| // { dg-options "-std=c++1z -fconcepts" } |
| |
| #include <cassert> |
| |
| template<typename T> |
| concept bool C() { return __is_class(T); } |
| |
| template<typename T> |
| concept bool D() { return C<T>() && __is_empty(T); } |
| |
| struct X { } x; |
| struct Y { int n; } y; |
| |
| int called = 0; |
| |
| template<typename T> |
| struct S { |
| void f() { called = 0; } // #1 |
| void f() requires C<T>() { called = 0; } // #2 |
| |
| void g() requires C<T>() { } // #1 |
| void g() requires D<T>() { } // #2 |
| }; |
| |
| template<> void S<int>::f() { called = 1; } // Spec of #1 |
| template<> void S<X>::f() { called = 2; } // Spec of #2 |
| |
| template<> void S<X>::g() { called = 3; } // Spec of #2 |
| template<> void S<Y>::g() { called = 4; } // Spec of #1 |
| |
| int main() { |
| S<double> sd; |
| S<int> si; |
| S<X> sx; |
| S<Y> sy; |
| |
| sd.f(); |
| assert(called == 0); |
| si.f(); |
| assert(called == 1); |
| sx.f(); |
| assert(called == 2); |
| sy.f(); |
| assert(called == 0); |
| |
| sx.g(); |
| assert(called == 3); |
| sy.g(); |
| assert(called == 4); |
| } |