Swapping addresses of pointers in C++

Question

How can one swap pointer addresses within a function with a signature?

Let\'s say:

int weight, height;
void swap(int* a, int* b);

S

Answer 1

If you want to swap the addresses that the pointers are pointing to, not just the values stored at that address, you'll need to pass the pointers by reference (or pointer to pointer).

#include 
void swap(int*& a, int*& b)
{
    int* c = a;
    a = b;
    b = c;
}

int main()
{
    int a, b;
    int* pa = &a;
    int* pb = &b;

    swap(pa, pb);

    assert(pa == &b);  //pa now stores the address of b
    assert(pb == &a);  //pb now stores the address of a
}

Or you can use the STL swap function and pass it the pointers.

#include 

std::swap(pa, pb);

Your question doesn't seem very clear, though.