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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. template<typename T>
  5. struct myIterator : public std::iterator<std::input_iterator_tag, T*>
  6. {
  7.     myIterator(T* data) :
  8.       data(data)
  9.     {}
  10.     T* data;
  11.  
  12.     bool operator==(const myIterator& rhs){return rhs.data == data;}
  13.     bool operator!=(const myIterator& rhs){return rhs.data != data;}
  14.     T* operator*(){return data;}
  15.     T* operator->(){return data;}
  16.  
  17.     myIterator& operator++(){data = &data[1]; return *this; }
  18. };
  19.  
  20. int main() {
  21.  
  22. 	int myData[] = {
  23. 		1, 2, 3,
  24. 		4, 5, 6,
  25. 		7, 8, 9
  26. 	};
  27.  
  28. 	size_t w = 3, h = 3;
  29. 	std::vector<std::vector<int*>> data;
  30. 	data.reserve(w);
  31.  
  32. 	for (size_t i = 0; i < w; ++i)
  33. 	{
  34. 	    data.emplace_back(myIterator<int>(&myData[i * h]),
  35. 	    	myIterator<int>(&myData[(i + 1) * h]));
  36. 	}
  37.  
  38. 	for (const auto& i : data)
  39. 		for (const auto& j : i)
  40. 			std::cout << *j << std::endl;
  41.  
  42. 	std::cout << "or with index access: " << std::endl;
  43.  
  44. 	for (size_t i = 0; i < w; ++i)
  45. 		for (size_t j = 0; j < h; ++j)
  46. 			std::cout << *data[i][j] << std::endl;
  47. }
Success #stdin #stdout 0s 3480KB
comments (?)
stdin
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Standard input is empty
stdout
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1
2
3
4
5
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8
9
or with index access: 
1
2
3
4
5
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9
https://ideone.com/b4HjyD
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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