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  1. #include <iostream>
  2.  
  3. class A { 
  4. private:
  5.     int a;
  6. public:
  7.     A(int a) : a(a) { } 
  8.     void print() { std::cout << a; }
  9.  
  10.     A& operator+=(const A &other) {
  11.         a += other.a;
  12.         return *this;
  13.     }   
  14. };
  15.  
  16. class B : public A { 
  17. private:
  18.     int b;
  19. public:
  20.     B(int a, int b) : A(a), b(b) { } 
  21.     void print() { 
  22.     	std::cout << '('; 
  23.     	A::print();
  24.     	std::cout << ", " << b << ')' << std::endl;
  25.     }
  26.  
  27.     B& operator+=(const B &other) {
  28.         A::operator+=(other);
  29.         b += other.b;
  30.         return *this;
  31.     }   
  32. };
  33.  
  34. int main() {
  35.     B b1(1, 2); 
  36.     B b2(3, 4); 
  37.     b1.print();
  38.     b1 += b2; 
  39.     b1.print();
  40.  
  41.     return 0;
  42. }
Success #stdin #stdout 0s 4380KB
comments (?)
stdin 
Standard input is empty
stdout 
(1, 2)
(4, 6)
https://ideone.com/tVqsoE
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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