1 // RUN: %clang_cc1 -std=c++11 -verify %s 2 3 namespace std_example { 4 struct A { A(int); }; 5 struct B : A { using A::A; }; 6 7 struct C1 : B { using B::B; }; 8 struct C2 : B { using B::B; }; 9 10 struct D1 : C1, C2 { 11 using C1::C1; // expected-note {{inherited from base class 'C1' here}} 12 using C2::C2; // expected-note {{inherited from base class 'C2' here}} 13 }; 14 15 struct V1 : virtual B { using B::B; }; 16 struct V2 : virtual B { using B::B; }; 17 18 struct D2 : V1, V2 { 19 using V1::V1; 20 using V2::V2; 21 }; 22 23 D1 d1(0); // expected-error {{constructor of 'A' inherited from multiple base class subobjects}} 24 D2 d2(0); // OK: initializes virtual B base class, which initializes the A base class 25 // then initializes the V1 and V2 base classes as if by a defaulted default constructor 26 27 struct M { M(); M(int); }; 28 struct N : M { using M::M; }; 29 struct O : M {}; 30 struct P : N, O { using N::N; using O::O; }; 31 P p(0); // OK: use M(0) to initialize N's base class, 32 // use M() to initialize O's base class 33 } 34