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  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4.  
  5. class Base {
  6.  public:
  7.  virtual string toString() const {
  8.    return "base";
  9.  }
  10. };
  11.  
  12. class Child : public Base {
  13.  public:
  14.   virtual string toString()  const {
  15.    return "child";
  16.   }
  17.  
  18.   friend ostream& operator<<(ostream& out, const Base& b);
  19. };
  20.  
  21. ostream& operator<<(ostream& out, const Base& b) {
  22. 	out << b.toString();
  23. 	return out;
  24. }
  25.  
  26. int main() {
  27. 	Child c;
  28. 	cout << c;
  29. 	return 0;
  30. }
Success #stdin #stdout 0s 3456KB
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Standard input is empty
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child
https://ideone.com/EmP1oP
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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