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  1. #include <iostream>
  2.  
  3. class Bar;
  4. class Foo {
  5. public:
  6.     Foo() : a_(0) {};
  7.     Foo(int a) : a_(a) {};
  8.     Foo(const Bar& bar_);
  9.  
  10.     inline int getA() { return a_; };
  11.     virtual void print();
  12. private:
  13.     int a_;
  14.     Foo* foo;
  15. };
  16.  
  17. class Bar : public Foo {
  18. public:
  19.     Bar() : Foo(), b_(0) {};
  20.     Bar(int a, int b) : Foo(a), b_(b) {};
  21.     inline int getB() { return b_; };
  22.     virtual void print() override { std::cout << "{a: " << getA() << ", b: " << getB() << "}\n"; };
  23. private:
  24.     int b_;
  25. };
  26.  
  27. Foo::Foo(const Bar& bar_) {
  28.     foo = new Bar(bar_);
  29. }
  30.  
  31. void Foo::print() {
  32.     if (foo == 0)
  33.         std::cout << "{a: " << getA() << "}\n";
  34.     else
  35.         foo->print();
  36. };
  37.  
  38. int main() {
  39.     Foo t1 = Bar(10,10);
  40.     Bar t2 = Bar(20,20);
  41.     Foo *t3 = new Bar(30,30);
  42.     t1.print();
  43.     t2.print();
  44.     t3->print();
  45.     delete t3;
  46.     return 0;
  47. }
Success #stdin #stdout 0s 3472KB
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Standard input is empty
stdout
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{a: 10, b: 10}
{a: 20, b: 20}
{a: 30, b: 30}
https://ideone.com/EFP41W
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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