1 // Testcase from P0136 2 // { dg-do compile { target c++11 } } 3 // { dg-options -fnew-inheriting-ctors } 4 5 struct A { A(int); }; 6 struct B : A { using A::A; }; 7 8 struct C1 : B { using B::B; }; 9 struct C2 : B { using B::B; }; 10 11 struct D1 : C1, C2 { 12 using C1::C1; 13 using C2::C2; 14 }; 15 16 struct V1 : virtual B { using B::B; }; 17 struct V2 : virtual B { using B::B; }; 18 19 struct D2 : V1, V2 { 20 using V1::V1; 21 using V2::V2; 22 }; 23 24 D1 d1(0); // { dg-error "" } ambiguous 25 D2 d2(0); // OK: initializes virtual B base class, which initializes the A base 26 // class then initializes the V1 and V2 base classes as if by a 27 // defaulted default constructor 28