cpp iterator problem

Question

template<class T>
    class mStack
    {
    private:
       vector<T> a; 
       vector<T>::iterator top;
    public:
       void push(T);
       T pop();
       mStack();
       void printStack();
};

The code with above class is not getting compiled... why? What is the problem? The compiler says "expected ; above top".

Answer 1

You need a typename:

typename vector<T>::iterator top;

This reassures the compiler thar vector<T> really is a type. For a discussion of this and other template gotchas, see the C++ FAQ.