the iterator of a list class

[Guan Kangle]

I want to define a nested class iterator of the dlist class, thus I coded it as following. I know it is incorrect but I do not know what is the right way...

//template <class T> class dNode;
template <class T>
class dlist{
private:        
    int size;
        //other things
public:
    class iterator;//nested class
        //other things
}

template <class T>      //Problem 1：is this right， that is to say is the                     
                        //iterator class a templated class?
class dlist::iterator{
public:
    iterator();
        func();
}

template <class T>//Problem 2: how can I define the member function of the 
                  //iterator?
dlist<T>::iterator<T>::iterator(){
        //codes
}

any help would be greatly appreciated~