Another Template Function

Here's another template
 template  <typename  T>
 T  sum(const  vector<T>  &v)
 {
         T  result  =  0;
         for  (typename vector<T>::size_type
                              i  =  0;  i  <  v.size();  ++i)
                 result  +=  v[i];
         return  result;
 }