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  1. #include <iostream>
  2. #include <functional>
  3. using namespace std;
  4.  
  5. int doble(int x) {
  6. 	return x * 2;
  7. }
  8.  
  9. class Doblador {
  10. public:
  11. 	int operator()(int x) {
  12. 		return x * 2;
  13. 	}
  14. };
  15.  
  16. int main() {
  17. 	Doblador d;
  18. 	function<int(int)> f = doble;
  19.  
  20. 	cout << "Doble de 2 = " << f( 2 ) << endl;
  21.  
  22. 	f = d;
  23. 	cout << "Doble de 2 = " << f( 2 ) << endl;
  24.  
  25. 	return 0;
  26. }
Success #stdin #stdout 0s 3460KB
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Standard input is empty
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Doble de 2 = 4
Doble de 2 = 4
https://ideone.com/5lALLH
Demo de function<>
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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