76     std::map<int, MapItem*>::const_iterator it = map_.begin();  in First()  local
77     if (it != map_.end())  in First()
79         return it->second;  in First()
86     std::map<int, MapItem*>::const_reverse_iterator it = map_.rbegin();  in Last()  local
87     if (it != map_.rend())  in Last()
89         return it->second;  in Last()
100     std::map<int, MapItem*>::const_iterator it = map_.find(item->item_id_);  in Next()  local
101     if (it != map_.end())  in Next()
103         it++;  in Next()
104         if (it != map_.end())  in Next()
106             return it->second;  in Next()
119     std::map<int, MapItem*>::const_iterator it = map_.find(item->item_id_);  in Previous()  local
120     if ((it != map_.end()) &&  in Previous()
121        (it != map_.begin()))  in Previous()
123         --it;  in Previous()
124         return it->second;  in Previous()
131     std::map<int, MapItem*>::const_iterator it = map_.find(id);  in Find()  local
132     if (it != map_.end())  in Find()
134         return it->second;  in Find()
145     std::map<int, MapItem*>::iterator it = map_.find(item->item_id_);  in Erase()  local
146     if (it != map_.end())  in Erase()
148         delete it->second;  in Erase()
149         map_.erase(it);  in Erase()
157     std::map<int, MapItem*>::iterator it = map_.find(id);  in Erase()  local
158     if (it != map_.end())  in Erase()
160         delete it->second;  in Erase()
161         map_.erase(it);  in Erase()