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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. template <typename T> class Coor;
  6. template <typename T> T getX(const Coor<T>& c);
  7. template <typename T> T getY(const Coor<T>& c);
  8.  
  9. template <typename T>
  10. class Coor {
  11.     friend T getX<>(const Coor<T>& c);
  12.     friend T getY<>(const Coor<T>& c);
  13.   private:
  14.     T x;
  15.     T y;
  16.   public:
  17.     Coor(const T& a, const T& b) : x(a), y(b) {}
  18. };
  19.  
  20. template <typename T>
  21. T getX(const Coor<T>& c) {
  22.     return c.x;
  23. }
  24.  
  25. template <typename T>
  26. T getY(const Coor<T>& c) {
  27.     return c.y;
  28. }
  29.  
  30. int main() {
  31.     Coor<int> coor(0, 1);
  32.     Coor<double> dcoor(0.123, 12.345);
  33.     cout << getX(coor) << ", " << getY(coor) << endl;
  34.     cout << getX(dcoor) << ", " << getY(dcoor) << endl;
  35.     return 0;
  36. }
Success #stdin #stdout 0s 2896KB
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stdin
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Standard input is empty
stdout
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0, 1
0.123, 12.345
https://ideone.com/TlITUy
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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