迭代器iterator

现在接着上篇的，写一来标识vector 的元素的对象迭代器iterator:

还是通过具体代码举例：

下面我讲了一个我暑期团队的故事哦~~：

 #include<iostream>
 #include<vector>
 using namespace std;
 int main()
 {
     vector<string> myteam;
     myteam.push_back("Kai She");
     myteam.push_back("Cai Baobao");
     myteam.push_back("This is me");
 
     vector<string>::iterator myIte;  //迭代器iterator的引用方法
     vector<string>::const_iterator ite; // 常量迭代器，不能引用它来更改它所引用的元素，但是它本身可以更改
 
     cout <<" Your teams are:\n";
     for (ite = myteam.begin(); ite != myteam.end(); ++ite)//遍历容器
         cout << "\t " << *ite << endl;
 
     cout <<" Because Kai She goes to work, Chen Baobao student comes:\n";
     myIte = myteam.begin();//更改元素的值，，，此处表示更改第一个元素的值
     *myIte = "Chen Baobao";//队长走了，换成了另一个队友~~
     cout << "\n Now ,your teams are:\n";
     for ( ite = myteam.begin(); ite != myteam.end(); ++ite)
             cout << *ite << endl;
 
     cout <<"\n The teams name ' " << *myIte << " ' has "
          <<(*myIte).size() << " letters in it.\n";//这个方法不大好
      cout << "\n The teams name ' " << *myIte << " ' has "
            << myIte->size() << " letters in it\n";//第二种方法
 
      cout << "You find a member join in your team\n" ;
      myteam.insert(myteam.begin(),  " Xing Baobao");//添加新的成员，直接加入了一个新成员
 
       cout << " Because you are not excellent enough , you were pop" << endl;
       myteam.erase(myteam.begin() + 2);//我被我的团队踢出去了~~~哈哈
 
      cout <<"\n Your teams :\n";
      for (ite = myteam.begin(); ite != myteam.end(); ++ite)
         cout << *ite << endl;
 
 }

可以顺便看一下运行结果就可以很清楚的理解iterator的用法了~~

具体例子我写的是自己的队员，通过string对象的myIte 的迭代器：用来标识vector中的一个特定元素的值它是vector中引用一种元素的方法；

在遍历容器时：end()成员函数返回容器中最后一个元素之后的迭代器（不是最后一个元素），所以，不能从end（）返回的迭代器中获取值。

在删除一个一个元素时用erase,如果要从在内删除的话，可以在begin()后面直接加数字就行：例如要删除第3个元素：

myteam.erase(myteam.begin() + 2);

所以vector以及iterator的基本用法先写这么点了~~~