C++ iterator for custom template class -

i have nested iterator in custom stack template class. problem nested iterator's constructor not match when create iterator stack in main. wonder problem be.

template <class t> class stack { private:     int top;     t st[100];  public:     class my_iterator     {     public:         my_iterator() : list(0), curr(0) {};      private:          stack<t> list;         int curr;     };  //publics in stack class public:     stack();     void push(t i);     t pop();     void print();     bool is_full();     my_iterator begin() {};  }; 

and create iterator stack following line in main

stack<double>::my_iterator it; 

it looks forgot *:

class my_iterator { public:     my_iterator() : list(0), curr(0) {}; private:     stack<t>* pstack; // pointer stack.     int curr; }; 

of course, need more members (including better constructors) class. should @ least allow create default iterators not point stack in particular.