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  1. #include <iostream>
  2. #include <vector>
  3. #include <algorithm>    // std::remove_if
  4. using namespace std;
  5.  
  6. template <typename T>
  7. class check {
  8. 	public:
  9. 	virtual bool operator()(T x) = 0;
  10.  
  11. 	struct aid{
  12. 		aid(check *p){ _c = p;}
  13. 		check *_c;
  14. 		bool operator()(T x){
  15. 			return _c->operator ()(x);
  16. 		}
  17. 	};
  18.  
  19. 	aid retMe(){
  20. 		return aid(this);
  21. 	}
  22. };
  23.  
  24. int main() {
  25.  
  26. 	int array[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
  27.    std::vector<int> v( array, array+10 );
  28.  
  29.    class even : public check<int>
  30.    {
  31.    	public:
  32.     	virtual bool operator()( int x ) { cout<<"Hi"<<endl; return !( x % 2 ); }
  33.    };
  34.    even e;
  35.  
  36.    remove_if( v.begin(), v.end(), e.retMe()); // no error
  37.  
  38.    return 0;
  39. }
Success #stdin #stdout 0s 3428KB
comments (?)
stdin 
Standard input is empty
stdout 
Hi
Hi
Hi
Hi
Hi
Hi
Hi
Hi
Hi
Hi
https://ideone.com/6SZ4UH
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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