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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. template <typename T, typename M>
  6. M membersum(vector<T> array, M (T::*mptr)) {
  7. 	M sum = 0;
  8. 	for (int i=0; i<array.size(); i++) {
  9. 		sum += (array[i].*mptr);
  10. 	}
  11. 	return sum;
  12. }
  13.  
  14. struct Point {
  15. 	Point(int x, int y, float z): x(x), y(y), z(z) {}
  16. 	int x;
  17. 	int y;
  18. 	float z;
  19. };
  20.  
  21. int main() {
  22. 	vector<Point> points;
  23. 	points.push_back(Point(1,2,3.8));
  24. 	points.push_back(Point(1,2,4.5));
  25. 	points.push_back(Point(1,2,1.7));
  26. 	// your code goes here
  27. 	cout << "sum x: " << membersum(points, &Point::x) << endl;
  28. 	cout << "sum y: " << membersum(points, &Point::y) << endl;
  29. 	cout << "sum z: " << membersum(points, &Point::z) << endl;
  30. 	return 0;
  31. }
Success #stdin #stdout 0s 3232KB
comments ()
stdin 
Standard input is empty
stdout 
sum x: 3
sum y: 6
sum z: 10
https://ideone.com/X4aYiY
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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