looking for a good pointer info

[CppCoder2010]

Paul is right. If you use the address of operator you are passing a pointer which is by value to the function.

You pass by reference doing the following.

void Function1(int & x)
{
    // notice the & after the type of variable before the name of the variable
   x += 100;
}

If you were passing a pointer by reference like the below, the address that the pointer points at could be modified.

void Function2(int *& pX)
{
    pX += 100; // dangerous, adds 100 integer widths to the pointer variable, not the integer it points at.
}

Which is essentially doing the same thing as a pointer to a pointer, just the address cannot change.

void Function3(int ** pX)
{
    *pX += 100; // we dereference the pointer to a pointer to get a reference to the pointer, this is just the same as the above code.
}