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  1. #include <fstream>
  2. #include <vector>
  3. #include <list>
  4. #include <math.h>
  5. #include <iostream>
  6. #include <memory>
  7. using namespace std;
  8.  
  9. template <class T>
  10. class Factory {
  11. protected:
  12.     int num;
  13. public:
  14.     Factory(int num) : num(num) {}
  15.     virtual T * create() {
  16.         return new T(num);
  17.     }
  18. };
  19.  
  20. class Integer {
  21.     int num;
  22. public:
  23.     Integer(int num) : num(num) {}
  24. };
  25.  
  26. class Pair {
  27.     int num1, num2;
  28. public:
  29.     Pair(int num1, int num2 = 42) : num1(num1), num2(num2) {}
  30. };
  31.  
  32. class ExtendedFactory : public Factory<Pair> {
  33. protected:
  34.     int num2;
  35. public:
  36.     ExtendedFactory(int num1, int num2) : Factory(num1), num2(num2) {}
  37.     virtual Pair * create() {
  38.         return new Pair(num, 24);
  39.     }
  40. };
  41.  
  42. int main()
  43. {
  44.     Factory<Integer> ints(42);
  45.     ints.create();
  46.     return 0;
  47. }
Success #stdin #stdout 0s 3456KB
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https://ideone.com/yQu8rh
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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