Thread: Passing double pointer by reference

Hi all

I have a 2D array created by double pointer. I would like to pass my double pointer by reference to a function. However, I tried something like function_name(int **&matrix) but it shows compilation error. So I wonder if there is any alternative way of passing the double pointer by reference?

I also tried to use triple pointer in order to pass the double pointer by reference but it doesn't work.

My code is something like this for the triple pointer.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void print(int** a)
{
    int i, j;
    for(i = 0; i <2; i++){
        for(j=0;j<2;j++)
            printf("%d ", a[i][j]);
        printf("\n");
    }
}

void fill(int*** a)
{
    int i, j;
    *a = (int**) malloc(sizeof(int*) * 2);
    for( i = 0; i < 2; i++)
        *a[i] = (int*) malloc(sizeof(int)*2);

    for(i = 0; i <2; i++)
        for(j=0;j<2;j++)
            *a[i][j] = 9;
}


int main(int argc, char *argv[])
{
    int **a;

    fill(&a);
    print(a);
    return 0;
}

Anyone can help me?