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".

score 12 · Accepted Answer · 2009-03-25 11:28:05Z

12

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.

edited Mar 25, 2009 at 11:28

answered Mar 25, 2009 at 11:20

anon

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3 Comments

sharptooth Over a year ago

Just replace your string with "top" with what Neil suggests.

Pete Kirkham Over a year ago

I wish that I could write a good, simple explanation for when exactly it's required, but in reality most of the time just adding typename before anything which is a type which uses a template parameter is harmless and works.

anon Over a year ago

@pete - that's why I refer them to the faq :-)

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