Is it possible to make a pointer to a column of an existing 2d array

[tr6699]

I have dynamically created a 2d bool array and was wondering if i could create a pointer that points to the second column of the array.

[vmanes]

If you mean can you have a pointer that points to the contents of a column, such that you pass that pointer to a function expecting a 1D array and it will process that column, NOPE.

You can have a pointer which points to the second element of any given row, but will just give you access that that row, starting at that element.

[tr6699]

No, I want to point to the first element of the second column and then traverse to the bottom of the column and do some calculations on the individual elements.

[vmanes]

Then you'll have to deal with the full 2D array, traverse row to row, accessing only the column index you're interested in.

If you have an existing function that takes a 1D parameter and you want it to deal with a column from the 2D, I'd make a copy of the column into a temporary 1D array and pass that to the function.

[Ancient Dragon]

You could do it something like this, which increments the pointer by 2 on every loop iteration.

int main()
{
    int array[10][2] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20};
    int* p = (int *)&array[0][1];
    for(int i = 0; i < 10; i++)
    {
        std::cout << *p << '\n';
        p += 2;
    }
   return 0;
}