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  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4.  
  5. template<typename T>
  6. class counted_type {
  7. 	static size_t counter;
  8. protected:
  9. 	counted_type(){}
  10. 	static size_t next_id() {
  11. 		return counter += 1;
  12. 	}
  13. public:
  14. 	size_t id = next_id();
  15.  
  16. };
  17. template<typename T>
  18. size_t counted_type<T>::counter = 0;
  19.  
  20. class person: public counted_type<person> {
  21. 	using counted_type<person>::id;
  22.  
  23. 	string first_name, last_name;
  24. public:
  25.  
  26. 	person(string const &fname, string const &lname):
  27. 		first_name(fname), last_name(lname){}
  28.  
  29. 	string to_string() const {
  30. 		return first_name + ", " + last_name + ", " + std::to_string(id);
  31. 	}
  32. };
  33.  
  34. class fruit: public counted_type<fruit> {
  35. 	using counted_type<fruit>::id;
  36.  
  37. 	string kind;
  38. public:
  39. 	fruit(string const &kind): kind(kind){}
  40.  
  41. 	string to_string() const {
  42. 		return kind + ", " + std::to_string(id);
  43. 	}
  44. };
  45.  
  46. int main() {
  47. 	person people[] = {
  48. 		person("John", "Travolta"),
  49. 		person("Rocky", "Balboa"),
  50. 		person("Rick", "Grimes")
  51. 	};
  52.  
  53. 	for(const auto &p: people) {
  54. 		cout << p.to_string() << endl;
  55. 	}
  56.  
  57. 	fruit fruits[] = {
  58. 		fruit("banana"),
  59. 		fruit("apple"),
  60. 		fruit("peach")
  61. 	};
  62.  
  63. 	for(const auto &f: fruits) {
  64. 		cout << f.to_string() << endl;
  65. 	}
  66.  
  67. 	return 0;
  68. }
Success #stdin #stdout 0s 3460KB
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stdin
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Standard input is empty
stdout
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John, Travolta, 1
Rocky, Balboa, 2
Rick, Grimes, 3
banana, 1
apple, 2
peach, 3
https://ideone.com/S2Yc8N
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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