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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <vector>
  4.  
  5. class Mensch{
  6. public: 
  7.     void eat(){ std::cout << "Essen\n";}
  8. };
  9.  
  10. class Maus{
  11. public:
  12.     void eat(){ std::cout << "Nagen\n";}
  13. };
  14.  
  15. class Huhn{
  16. public: 
  17.     void eat(){ std::cout << "Picken\n";}
  18. };
  19.  
  20. template <typename T>
  21. void apply_eat(T& t){
  22.     t.eat();
  23. }
  24.  
  25.  
  26. template <typename... Others>
  27. class Zoo;
  28.  
  29. template <typename Animal, typename... Others>
  30. class Zoo<Animal, Others...> : public Zoo<Others...>
  31. {
  32. private:
  33.     std::vector<Animal> animals;
  34. public:
  35.     using Zoo<Others...>::add;
  36.     void add(const Animal& f) {
  37.         animals.push_back(f);
  38.     }
  39.  
  40.     void eat_all(){
  41.         std::for_each(animals.begin(), animals.end(), apply_eat<Animal>);
  42.         animals.clear();
  43.         Zoo<Others...>::eat_all();
  44. 	}
  45. };
  46.  
  47. template <>
  48. class Zoo<>
  49. {
  50. public:
  51.     void add(){}
  52.     void eat_all(){}
  53. };
  54.  
  55.  
  56. int main()
  57. {
  58.     Zoo<Huhn, Maus, Mensch> zoo;
  59.     zoo.add(Mensch());
  60.     zoo.add(Huhn());
  61.     zoo.add(Maus()); 
  62.     zoo.add(Huhn()); 
  63.     zoo.eat_all();
  64.     std::cout << "--------------------\n";
  65.     zoo.add(Maus()); 
  66.     zoo.add(Huhn());zoo.add(Huhn()); zoo.add(Huhn());  
  67.     zoo.eat_all();
  68.     return 0;
  69. }
  70.  
Success #stdin #stdout 0s 4264KB
comments (?)
stdin 
Standard input is empty
stdout 
Picken
Picken
Nagen
Essen
--------------------
Picken
Picken
Picken
Nagen
https://ideone.com/F1lmQY
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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