templates and maps
 

I've got the following code:

template <typename T> int Histogram<T>::get_occurances(const T& obj)

{

         map<T,int>::iterator find_occur = frequency.find(obj);

         

         if ( find_occur == this->frequency.end() )

         {

            return 0;

         }

         

         return ( find_occur->second );

}

The following line always gives me an error saying ';' expected before find_occur.

map<T,int>::iterator find_occur = frequency.find(obj);

If I change the first argument of the map to something other than T, then it works fine, but I need the template type. Is there something I'm doing wrong?

Re: templates and maps
 

A type that depends on a template parameter needs to be qualified with the typename keyword.

template <typename T> int Histogram<T>::get_occurances(const T& obj)

{

         typename map<T,int>::iterator find_occur = frequency.find(obj);

         

         if ( find_occur == this->frequency.end() )

         {

            return 0;

         }

         

         return ( find_occur->second );

}

Re: templates and maps
 

Ahhh, thank you. I was actually looking into using a typename, but in a different context. I've never really understood why you have to qualify it with that.


Thanks man.