[Valmont]

Templates mate. Templates.

template <typename T> class MyArrayClass
{
public:
	MyArrayClass( int arraySize ); 
private:
	int size; 
	T* array; 

}

And below is how you could define a setItem method:

void dInt::setItem(  int pos, T val )
	{
		if(pos <= size)	
			array[pos] = val;
	}

And so forth. But I warn you, setting up a decent abstract array is hard .
For example, what do you have to do to make this always work?

array[pos] = val;

Try it if you like a challenge .