#include <iostream>
#include <list>
using namespace std;
int main ()
{
std::list<int> mylist1, mylist2;
std::list<int>::iterator it;
// set some initial values:
for (int i=1; i<=4; ++i)
mylist1.push_back(i);
cout << "mylist1 contains:";
for (it=mylist1.begin(); it!=mylist1.end(); ++it)
cout << ' ' << *it;
cout << endl; // mylist1: 1 2 3 4
for (int i=1; i<=3; ++i)
mylist2.push_back(i*10);
cout << "mylist2 contains:";
for (it=mylist2.begin(); it!=mylist2.end(); ++it)
cout << ' ' << *it;
cout <<endl; // mylist2: 10 20 30
it = mylist1.begin();
++it;
cout<<"it: "<<*it<<endl; // points to 2
mylist1.splice (it, mylist2); //第一种用法，list1调用splice方法，将list2中的元素插入到it前面，清空list2链表元素
// mylist1: 1 10 20 30 2 3 4
// mylist2 (empty)
// "it" still points to 2 (the 5th element)
cout<<"it: "<<*it<<endl; // points to 2
/*cout << "mylist1 contains:";
for (it=mylist1.begin(); it!=mylist1.end(); ++it)
cout << ' ' << *it;
cout << endl;
cout << "mylist2 contains:";
for (it=mylist2.begin(); it!=mylist2.end(); ++it)
cout << ' ' << *it;
cout << endl;*///这个遍历改变了it所指的值
mylist2.splice (mylist2.begin(),mylist1, it);//第二种用法，list2调用splice方法，将list1中的单个元素插入到list2位置的前面
// mylist1: 1 10 20 30 3 4
// mylist2: 2
// "it" is now invalid.
it = mylist1.begin();
advance(it,3); // 迭代器递增函数，"it" points now to 30
mylist1.splice ( mylist1.begin(), mylist1, it, mylist1.end());//第三种用法，list1调用splice方法，将list1的it位置到end位置插入到list1的begin前面
// mylist1: 30 3 4 1 10 20
cout << "mylist1 contains:";
for (it=mylist1.begin(); it!=mylist1.end(); ++it)
cout << ' ' << *it;
cout << endl;
cout << "mylist2 contains:";
for (it=mylist2.begin(); it!=mylist2.end(); ++it)
cout << ' ' << *it;
cout << endl;
return 0;
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