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 <first <<":" <second <

 string value1 = map1[2];
 if (value1.empty())
 {
 cout <<"not found" <::iterator it = map1.find(2);
 if (it == map1.end())
 {
 cout <<"not found" <first <<":" <second <

 //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);