C++ STL list容器中元素的存取和访问

list容器不提供 at() 和 操作符 operator[] ，对容器中元素的访问有些不便，但是我们可以使用迭代器进行元素的访问，例子如下：

#include <iostream>
#include <list>
#include <algorithm>
using namespace std;

void print(double& Ele){
    cout<<Ele<<",";
}

int main()
{
    list<double> mylist;
    mylist.push_back(11.1);
    mylist.push_back(22.2);
    mylist.push_back(33.3);
    mylist.push_back(44.4);
    int count=mylist.size();
    for_each(mylist.begin(),mylist.end(),print); //for_each遍历mylist
    cout<<endl;
    list<double>::iterator Iter_S;
    Iter_S=mylist.begin();
    cout<<"The Second element is "<<*(++(++Iter_S))<<endl;
    return 0;
}