c++ - Cannot pass template argument to std::list<T>::iterator -

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• where , why have put “template” , “typename” keywords? 5 answers

i made container template class follow:

template<typename k, typename v> class hash_table {  public:   class iterator {    private:     list<v> list_;                 // works     list<v>::iterator it_;         // fails: syntax-error "iterator"     list<int>::iterator it2_;      // works   }; //.... } 

can tell me, did wrong @ list<v>::iterator it_;? why should syntax error?

as @songyuanyao sugested, solution put typename before list<v>::iterator in:

template<typename k, typename v> class hash_table {  public:   class iterator {    private:     list<v> list_;                 // works     typename list<v>::iterator it_;         // no more fails     list<int>::iterator it2_;      // works   }; //.... } 

see also: c++ template typename iterator