clang/test/CXX/special/class.init/class.inhctor.init/p2.cpp

   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 }