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  1. #include <iostream>
  2.  
  3. class A
  4. {
  5. public:
  6.    virtual ~A() {}
  7.    void print()
  8.    {
  9.        print_impl();
  10.    }
  11. private:
  12.     virtual void print_impl() = 0;
  13. };
  14.  
  15. class B : public A
  16. {
  17.     void print_impl() { std::cout << "B" << std::endl; }
  18. };
  19.  
  20. int main()
  21. {
  22.     A* b = new B();
  23.     b->print();
  24. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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B
https://ideone.com/uNrb5a
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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