Question

I have a C++ function that checks and swaps pointer data. My problem is that once the variables go into the function it works properly with no issues, but whenever I return from the function it seems as if it was never entered as the vales still hold the same information from before entering the function.

Below is a code snippet.

bool Swap(int* pComp, int* pNew)
    {
        pComp = pNew;
        return true;
    }

Any advice is greatly appreciated

Answer 1

Your function doesn’t do anything, as it only affects the local pointer variables that exist within function scope. If you’re trying to swap two pointers, you would have to do:

Swap(int** pComp, int** pNew){
   int* tmp;
   tmp = *pComp;
   *pComp = *pNew;
   *pNew = tmp;
}