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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct IA {
  5. 	virtual void calcA() = 0;
  6. };
  7.  
  8. struct A : public IA {
  9. 	void calcA() { IA::calcA(); }
  10. };
  11.  
  12. int main() {
  13. 	// IA ia; // error: IA is abstract
  14. 	A a;
  15. 	a.calcA();
  16. 	return 0;
  17. }
  18.  
  19. void IA::calcA()  { cout << "default calcA()"; }
Success #stdin #stdout 0s 3296KB
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Standard input is empty
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default calcA()
https://ideone.com/2IAUcl
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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