CODEWITHSUNDEEP
c++pointersdynamic
Wellen
Wellen

Reputation: 61

c++ pointers to rows in dynamic matrix

I have a dynamic matrix in a class created by allocating memory in this way:

int **m;   //this in the member head pointer


void allocate_mem(int ***ptr, unsigned r, unsigned c){
    *ptr = new int *[r];
    (*ptr)[0] = new int[r*c];
    for(unsigned i = 1; i < r; i++)
        (*ptr)[i] = (*ptr)[0] + i*c;
}

how can I call the pointers to the rows? I mean, m is the pointer to the array of pointers, *m is the pointer to the first row, but I don't know how to call the pointers to the other row

Upvotes: 0

Views: 583

Answers (1)

Wojtek Surowka
Wojtek Surowka

Reputation: 21013

*m is the pointer to the row with index 0 indeed, but *m is equivalent to m[0]. So for other indexes use m[index]

Upvotes: 3

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