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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class PierwszyDelegat {
  5. public:
  6.     virtual void callBack() = 0;
  7. };
  8.  
  9. class Pierwsza {
  10.     protected:
  11.         PierwszyDelegat *delegat;
  12.     public:
  13.         Pierwsza() : delegat(nullptr) {}
  14.         virtual ~Pierwsza() {}
  15.         void wykonajCallback(){ if (delegat) delegat->callBack(); }
  16. };
  17.  
  18. class Druga : public Pierwsza, public PierwszyDelegat {
  19.     public:
  20.         Druga() {
  21.             delegat =  this;    
  22.         }
  23.         void callBack() { cout << "Test" << endl; }
  24. };
  25.  
  26. int main(){
  27.     Pierwsza *obj = new Druga();
  28.     obj->wykonajCallback();
  29.     delete obj;
  30.     return 0;
  31. }
  32.  
Success #stdin #stdout 0s 3228KB
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Standard input is empty
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Test
https://ideone.com/rbYSwI
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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