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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. class base
  6. {
  7.    friend class derived; //<======= note this line
  8.    private:
  9.       base()
  10.       {
  11.          cout << "base: ctor()\n";
  12.       }
  13. };
  14.  
  15. class derived: public base
  16. {
  17.    public:
  18.       derived()
  19.       {
  20.          cout << "derived: ctor()\n";
  21.       }
  22. };
  23.  
  24. int main()
  25. {
  26.    derived d;
  27. }
Success #stdin #stdout 0.01s 2724KB
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Standard input is empty
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base: ctor()
derived: ctor()
https://ideone.com/BgHSV
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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