_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

operator[]() template<class KeyType , class MappedType , class Hash = std::hash<KeyType>, class Pred = std::equal_to<KeyType>> MappedType & operator[] ( const KeyType &  key ) [] 运算符重载 [] 运算符重载 参数 [in] key 待查找元素键值 返回 映射值的引用