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  1. #include <iostream>
  2. #include <vector>
  3. #include <algorithm>
  4. using namespace std;
  5.  
  6. class IA {
  7.  public:
  8.   virtual int calcA() = 0;
  9. };
  10.  
  11. class IB: virtual public IA {
  12.  public:
  13.   virtual int calcB() = 0;
  14. };
  15.  
  16. class CalcA_Impl : virtual public IA {
  17.  public:
  18.   virtual int calcA() { cout << "default calcA()\n"; return 0; }
  19. };
  20.  
  21. class A : public CalcA_Impl {};
  22. class B : public IB, public CalcA_Impl  {
  23.  public:
  24.   using CalcA_Impl::calcA;
  25.   //virtual int calcA() { return CalcA_Impl::calcA(); }
  26.   virtual int calcB() { cout << "B::calcB()\n"; return 0; }
  27. };
  28.  
  29. int main() {
  30.     vector<IA*> v;
  31.     v.push_back (new A);
  32.     v.push_back (new B);
  33.     for_each (v.begin(), v.end(), [](IA* ia) {
  34.       ia->calcA();
  35.       IB *b = dynamic_cast<IB*>(ia);
  36.       if (b) {
  37.         b->calcB();
  38.       }
  39.     });
  40. }
Success #stdin #stdout 0s 3476KB
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Standard input is empty
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default calcA()
default calcA()
B::calcB()
https://ideone.com/9gNGTP
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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