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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. class Soldier{
  6. public:
  7.     Soldier(char c){
  8.         type = c;
  9.     }
  10. char type;
  11. };
  12.  
  13. int main() {
  14. 	const int armies = 3;
  15. 	const int soldiers_in_army = 5;
  16.  
  17. 	//a 2d vector of armies and its soldiers 
  18. 	vector< vector<Soldier> > *armys = new vector< vector<Soldier> >(armies, vector<Soldier>(soldiers_in_army, Soldier('@')));
  19. 	//making a pointer array 
  20. 	Soldier **deployment = new Soldier*[armies*soldiers_in_army];
  21. 	//test if it works
  22. 	cout << "the third soldier of the second army is of type " << (*armys)[1][2].type << endl;
  23.  
  24. 	//initializing the pointers of the deployment array to make them point to the Object through the vector.  
  25. 	deployment[1 * (armys->size()) + 2] = &(*armys)[1][2];
  26. 	cout << "the third soldier of the second army is of type " << deployment[1 * (armys->size()) + 2]->type << endl;
  27. 	//  (*deployment)[1 * (armys->size()) + 2] = (*armys)[1][2];
  28. 	//    cout << "the third soldier of the first army is of type " << (*deployment)[1 * (armys->size()) + 2].type << endl;	return 0;
  29.  
  30. 	// initialize the whole array of pointers 
  31. 	for(int i = 0; i<armys->size(); i++)
  32. 		for(int j = 0; j<(*armys)[i].size(); j++)
  33. 			deployment[i *soldiers_in_army + j] = &(*armys)[i][j];
  34.  
  35. 	// change some values
  36. 	(*armys)[0][1] = (*armys)[1][1] = (*armys)[2][1] = Soldier('C');  // captain
  37. 	(*armys)[0][4] = (*armys)[1][3] = (*armys)[2][2] = Soldier('H');  // horsemen
  38.  
  39. 	// display original 
  40. 	for(int i = 0; i<armys->size(); i++) {
  41. 		for(int j = 0; j<(*armys)[i].size(); j++)
  42. 			cout << (*armys)[i][j].type << " ";
  43. 		cout << endl;
  44. 	}
  45. 	// display via pointers  
  46. 	for(int i = 0; i<armies*soldiers_in_army; i++) {
  47. 		if(i%soldiers_in_army == 0)
  48. 			cout << endl;
  49. 		cout << deployment[i]->type << " ";
  50. 	}
  51.  
  52. }
Success #stdin #stdout 0s 3416KB
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Standard input is empty
stdout
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the third soldier of the second army is of type @
the third soldier of the second army is of type @
@ C @ @ H 
@ C @ H @ 
@ C H @ @ 

@ C @ @ H 
@ C @ H @ 
@ C H @ @
https://ideone.com/u2ZYo6
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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