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  1. #include <iostream>
  2.  
  3. class A1 {
  4.   public:
  5.   virtual void print() const
  6.   {
  7.     std::cout << "A1::print() called." << std::endl;
  8.   }
  9. };
  10.  
  11. class A2: public A1 {
  12.   public:
  13.   void print() const override
  14.   {
  15.     std::cout << "A2::print() called." << std::endl;
  16.   }
  17. };
  18.  
  19. class B1 {
  20.   public:
  21.   void print() const
  22.   {
  23.     std::cout << "B1::print() called." << std::endl;
  24.   }
  25. };
  26.  
  27. class B2: public B1 {
  28.   public:
  29.   void print() const
  30.   {
  31.     std::cout << "B2::print() called." << std::endl;
  32.   }
  33. };
  34.  
  35. using namespace std;
  36.  
  37. int main(void)
  38. {
  39.   A2 a2;
  40.   cout << "Calling a2.print(): ";
  41.   a2.print();
  42.   A1 &a1 = a2;
  43.   cout << "Calling a1.print(): ";
  44.   a1.print();
  45.   B2 b2;
  46.   cout << "Calling b2.print(): ";
  47.   b2.print();
  48.   B1 &b1 = b2;
  49.   cout << "Calling b1.print(): ";
  50.   b1.print();
  51.   return 0;
  52. }
  53.  
Success #stdin #stdout 0s 16064KB
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stdin
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Standard input is empty
stdout
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Calling a2.print(): A2::print() called.
Calling a1.print(): A2::print() called.
Calling b2.print(): B2::print() called.
Calling b1.print(): B1::print() called.
https://ideone.com/12lj5V
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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