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  1. #include <list>
  2. #include <utility>
  3. #include <iostream>
  4.  
  5. #define CALL_MEMBER_FN(object,ptrToMember)  ((object).*(ptrToMember))
  6.  
  7. class Base
  8. {
  9. public:
  10. 	void doForAllDerived()
  11. 	{
  12. 		for (handlerList_t::const_iterator it = _registeredHandlers.begin(); it != _registeredHandlers.end(); ++it )
  13. 		{	
  14. 			PrepFn pFn = (*it);
  15. 			CALL_MEMBER_FN(*this, pFn )( 5 );		
  16. 		}
  17. 	}
  18.  
  19. protected:
  20.     typedef void (Base::*PrepFn)( int n );
  21.  
  22.     void registerPrepFn( PrepFn fn )
  23.     {
  24.         _registeredHandlers.push_back( fn );
  25.     };
  26.  
  27. private:
  28.     typedef std::list< PrepFn > handlerList_t;
  29.     handlerList_t _registeredHandlers;
  30. };
  31.  
  32. class Derived : public Base
  33. {
  34. public:
  35.     Derived(int m) : _m(m) {
  36.         registerPrepFn( static_cast<PrepFn>(&Derived::derivedPrepFn) );
  37.     };
  38.  
  39. protected:
  40.     void derivedPrepFn( int n )
  41.     {
  42. 		std::cout << _m << ", " << n << std::endl;
  43. 	};
  44.  
  45. 	int _m;
  46. };
  47.  
  48. int main() {
  49.     Derived anInstance(20);
  50.     anInstance.doForAllDerived();
  51. }
  52.  
Success #stdin #stdout 0.02s 2856KB
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Standard input is empty
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20, 5
https://ideone.com/R67eZ
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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