double pointer

[cool17]

hey guys

what do u mean by double pointer in c++???

thank

[Banfa]

it means something like

int **

this is a pointer to a pointer to an integer

it could be used in this (very contrieved) way

#include <iostream>

using namespace std;

void allocInt( int **ppi)
{
    *ppi = new int;

    **ppi = 5;
}

void freeInt( int *pi)
{
    delete pi;
}

int main()
{
    int *myInt;

    allocInt(&myInt);

    cout << *myInt << "\n";

    freeInt(myInt);

    return 0;
}

In any function where we want to return a data via a parameter we have to use a pointer to the type we want to return. Since in allocInt we want to return an int * via a parameter we need a pointer to that type int **.

[cool17]

thank you...it really make me understand better now.