Question

How do I make a template specialization that takes 2 parameters versus the normal 1?
I was building a pointer class and now I thought about extending to make an array but if I try something like this:

template<class T,int s> class pointer{};
template<class T> class pointer{};

class mama{};
int main(){
    pointer<mama> m;
}

It gives me an error. Template… redeclared with 1 parameter.

I need it specialized because pointer<mama,10> has size() and operator[] while pointer<mama> doesn’t, it has operator-> and *.

Answer 1

You could make a general template for the array case:

template <class TElem, int size = 0>
class pointer
{
    // stuff to represent an array pointer
};

Then a partial specialization:

template <class TElem>
class pointer<TElem, 0>
{
    // completely different stuff for a non-array pointer
};

By defining a specialized version for the case where size=0, you can actually give that a totally different implementation, but with the same name.

However, it might be clearer just to give it a different name.