c++ - how to return index of element in vector -

given vector

vector<classx *> myvec; 

how return index i of 1 of elements in following function;

size_t nearestelement(classy const& p){      size_t i(0);      double d = distance(myvec[i]->position(), p);      (auto const& element : myvec){          if(distance(element->position(), p) < d){             = ???; // index of current element          }      return i;      } } 

where position() function defined in classx , distance not std::distance function, function defined self.

change range based regular for, or add indexing variable current for:

int index = 0; (auto const& element : myvec){                if(distance(element->position(), p) < d){         = index; // index of current element      }      index++ ...