C++标准模板库map的常用操作

 map map1; //方法1： map1.insert(pair(2, "beijing")); //方法2: map1[4] = "changping"; //方法3: map1.insert(map::value_type(1, "huilongguan")); //方法4: map1.insert(make_pair(3, "xierqi"));

 for (map::iterator it=map1.begin(); it!=map1.end(); it++) { cout << it->first << ":" << it->second << endl; }

 string value1 = map1[2]; if (value1.empty()) { cout << "not found" << endl; } //方法2 map::iterator it = map1.find(2); if (it == map1.end()) { cout << "not found" << endl; } else { cout << it->first << ":" << it->second << endl; }

 //修改数据 map1[2] = "tianjin";

 //方法1 map1.erase(1); //方法2 map::iterator it1 = map1.find(2); map1.erase(it1);