2 dimmensional dynamic array of pointers

[Liborac_]

HI. Is there a way how to create 2-dimmensional dynamic array of pointers ? Thanks in advance.

[Chris Losinger]

#include < vector > ... std::vector< CMyType * > my_dynamic_array; Image Toolkits | Image Processing | Cleek

[Anonymous]

int a = 17; int* (*pi)[32] = new int* [32][32]; pi[31][31] = &a; cout << *pi[31][31] << endl; delete [] pi;

[Alton Williams]

Declare as such: int **myArray These ways to allocate them myArray = new[] int [rows][cols]; or myArray = new[] int[rows * cols]; myArray = (int *) malloc(sizeof(int( rows * cols))); int counter myArray = new[] int* [rows] for (counter = 0; counter < rows; counter++) { myArray[counter] = new[] int [cols]; } don't forget to check if the memory has been allocated (if(myArray) ). This presents you using and dereferencing a NULL pointer. Good luck, Alton

[Rick York]

I like to access the data with the double bracket-style syntax, data[x][y], so this is what I do :

void **Allocate2DArray( int xdim, int ydim, int itemsize )
{
int x;
void **data = (void **)calloc( xdim, sizeof(void *) );
if( data == NULL )
return NULL;
for( x = 0; x < xdim; x++ )

= calloc( ydim, itemsize );

}

This allocates an array of pointers in which each item in the array is a pointer. This is obviously C-style allocation. It can be converted to C++ style using new without too much effort.

[Liborac_]

Thanks a lot ;)

[Axter]

Check out following link for safer ways to create a 2 dimensional dynamic array in C++. http://www.tek-tips.com/faqs.cfm?fid=5575[^] Top ten member of C++ Expert Exchange. http://www.experts-exchange.com/Cplusplus