c++ - Getting compilation error while trying to get const_iterator to find the element exist in the set or not - 


template <class t> node<t>* linkedlist<t>::findcommonnode_hash(linkedlist<t>* list_2)  {           unordered_set<node<t>*>* set = new unordered_set<node<t>*>();          node<t>* curr_list_1 = head->next;          node<t>* curr_list_2 = list_2->head->next;          unordered_set<node<t>*>::const_iterator itr = set->find(curr_list_1);          if(itr == set->end())          {              set->insert(curr_list_1);          }          else             return curr_list_1;          unordered_set<node<t>*>::const_iterator itr1 = set->find(curr_list_2);          if((itr1 == set->end()))          {              set->insert(curr_list_2);          }          else             return curr_list_2;          return nullptr; }

ide: codeblock c++11 . getting below error when trying const_iterator find element exist in set or not.

 c:\education\datastructure_algorithms\list\list.cpp|252| error: need 'typename' before 'std::unordered_set<node<t>*>:: const_iterator' because 'std::unordered_set<node<t>*>' dependent scope|

as error message suggests have add typename keyword because const_iterator dependent name in case.

like this:

typename unordered_set<node<t>*>::const_iterator itr = set->find(curr_list_1);

and of course same other similar line.

anyway code doesn't seem make sense, guess that's because it's work in progress.


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