_map_citr _map_itr _map_key2entry _size _values begin begin clear const_iterator empty end end EntryType erase erase find find HashMap insert insert iterator operator== operator[] size

const_iterator template<class KeyType , class MappedType , class Hash = std::hash<KeyType>, class Pred = std::equal_to<KeyType>> typedef std::list<EntryType>::const_iterator const_iterator list 中的 const 迭代器类型