c++ code std::map iterator map

IT 

map<DWORD,MACADDR> arpmap=CAddressHelper::GetARPCache();

   	map<DWORD,MACADDR>::iterator it;

    	for (it = arpmap.begin(); it != arpmap.end(); ++it) {
    		MACADDR &sMac = (*it).second;
    		const DWORD &nIP=(*it).first;
 
    		}



c++ 11
for (auto x: arpmap) {
  cout << x.first << endl;
}