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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class A {
  5. public:
  6.     A() { cout << "A"; }
  7.     A(const A&) { cout << "a"; }
  8. };
  9.  
  10. class B : public virtual A {
  11. public:
  12.     B() { cout << "B"; }
  13.     B(const B&) { cout << "b"; }
  14. };
  15.  
  16. class C : public virtual A {
  17. public:
  18.     C() { cout << "C"; }
  19.     C(const C&) { cout << "c"; }
  20. };
  21.  
  22. class D : public B, C {
  23. public:
  24.     D() { cout << "D"; }
  25.     D(const D&) { cout << "d"; }
  26. };
  27.  
  28. int main()
  29. {
  30.     D d;
  31.     D d2{d}; // or: D d2 = d;
  32.     return 0;
  33. }
Success #stdin #stdout 0s 5480KB
comments (?)
stdin 
Standard input is empty
stdout 
ABCDABCd
https://ideone.com/i2Wckl
language:
C++ 4.3.2 (gcc-4.3.2)
created:
4 years ago
visibility:
public

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