Why do we need typename here?

Question

template
class Set 
{
public:
   void insert(const T& item);
   void remove(const T& item);
private:
   std::list rep;
}

template<         


        

Answer 1

If you are talking of typename used with std::list::iterator:

The typename is used to clarify that iterator is a type defined within class std::list. Without typename, std::list::iterator will be considered a static member. typename is used whenever a name that depends on a template parameter is a type.