(C++) Passing a pointer into a template

I have two pointers. p1. p2.
p1 and p2 both point to different classes.
The classes have some similar method names,
and I'd like to call a template function twice to avoid repeated code.
Here is my function:

template <class T>
void Function(vector<T> & list, T* item, const string & itemName)

see that middle paramater, "item".. is that how my signature should look if I want the item changed?

..or should I pass it as
T* & item

..or should I pass it as
T** item

the compiler is letting a lot of things slide, but then when I go to bind everything it breaks.

How do I call that function using one of my pointers?
something about casting?? I've tried everything :

---

You should be able to call your code like this:

template <class T>
void Function(std::vector<T> & list, T* item, const std::string & itemName)
{
    list.push_back(T());
    if (item != NULL)
      item->x = 4;
}

struct A
{
    int x;
};
struct B
{
    double x;
};
A a;
B b;
std::vector<A> d;
std::vector<B> i;
Function(d, &a, "foo");
Function(i, &b, "bar");

Note that passing a parameter by reference and by pointer has slightly different meaning, eg pointers can be NULL, see Are there benefits of passing by pointer over passing by reference in C++?.

I wonder if it's desired to pass item by pointer and list by (non-const) reference.

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