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  1. #include <iostream>
  2. #include <cstring>
  3. using namespace std;
  4.  
  5. #define SIZE (1)
  6. struct arry
  7. {
  8. private:
  9. 	int *n = NULL;
  10. 	int size;
  11. public:
  12. 	arry()	{ n = new int[SIZE]; size = SIZE; }
  13. 	~arry() { delete [] n; }
  14. 	inline int length() const { return size; }
  15. 	int& operator [] (int p) const { return n[p]; }
  16. 	void incSize() {
  17. 		int *temp = new int[size + 1];
  18. 		memcpy(temp, n, sizeof(int) * size);
  19. 		delete [] n;
  20. 		n = temp;
  21. 		size++;
  22. 	}
  23. };
  24.  
  25. int main() {
  26.  
  27. 	arry dyn;
  28.  
  29. 	dyn[0] = 100;
  30.  
  31. 	cout << dyn.length() << endl;
  32.  
  33. 	dyn.incSize();
  34.  
  35. 	cout << dyn.length() << endl;
  36.  
  37. 	dyn[1] = 200;
  38.  
  39. 	cout << dyn[0] << endl;
  40. 	cout << dyn[1] << endl;
  41.  
  42. 	return 0;
  43. }
Success #stdin #stdout 0s 3428KB
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1
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100
200
https://ideone.com/A7TCMo
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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