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  1. #include <iostream>
  2. #include <vector>
  3. #include <string>
  4.  
  5. template <class T>
  6. class iterator {
  7. public:
  8. 	iterator() {}
  9. 	iterator(std::vector<T> vec) {
  10. 		container = vec;
  11. 	}
  12. 	bool hasNext() {
  13. 		if (curr_pos == container.size()) {
  14. 			return false;
  15. 		} else {
  16. 			if (curr_pos < container.size()) {
  17. 				return true;
  18. 			}
  19. 		}
  20. 		return false;
  21. 	}
  22. 	T& next(){
  23. 		if (hasNext()) {
  24. 			curr_pos += 1;
  25. 			return container.at(curr_pos-1);	
  26. 		}
  27. 	}
  28. private:
  29. 	std::vector<T> container;
  30. 	int curr_pos = 0;
  31. };
  32.  
  33. int main() {
  34. 	std::vector<int> int_vec {1,2,3,4};
  35. 	iterator<int> int_it(int_vec);
  36. 	while (int_it.hasNext()) {
  37. 		std::cout << int_it.next() << " ";
  38. 	}
  39.  
  40. 	std::cout << std::endl;
  41.  
  42. 	std::vector<std::string> str_vec {"a", "b", "c","d"};
  43. 	iterator<std::string> str_it(str_vec);
  44. 	while(str_it.hasNext()) {
  45. 		std::cout << str_it.next() << " ";
  46. 	}
  47. 	std::cout << std::endl;
  48. 	std::vector<int> empty_vec;
  49. 	iterator<int> empty_it(empty_vec);
  50. 	while(empty_it.hasNext()) {
  51. 		std::cout << empty_it.next() << " ";
  52. 	}
  53. 	return 0;
  54. }
Success #stdin #stdout 0s 3464KB
comments (?)
stdin
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Standard input is empty
stdout
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1 2 3 4 
a b c d
https://ideone.com/8w6qhj
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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