#include <iostream>
#include <list>
using namespace std;
template<class T>
void exchange(list<T>& l1, typename list<T>::iterator p1, list<T>& l2, typename list<T>::iterator p2) {
list<T> temp;
temp.splice(temp.begin(), l1, p1, l1.end());
l1.splice(l1.end(), l2, p2, l2.end());
l2.splice(l2.end(), temp, temp.begin(), temp.end());
}
typedef list<int> INTLIST;
int main() {
INTLIST l1, l2;
for (int i = 0; i < 4; i++)
l1.push_back(i);
for (int i = 6; i < 12; i++)
l2.push_back(i);
INTLIST::iterator li;
cout << "交换前" << endl;
cout << "l1: ";
for (li = l1.begin(); li != l1.end(); li++)
cout << *li << ' ';
cout << endl;
cout << "l2: ";
for (li = l2.begin(); li != l2.end(); li++)
cout << *li << ' ';
cout << endl;
INTLIST::iterator p1, p2;
p1 = l1.begin();
p2 = l2.begin();
exchange(l1, ++(++p1), l2, ++p2);
cout << "交换后" << endl;
cout << "l1: ";
for (li = l1.begin(); li != l1.end(); li++)
cout << *li << ' ';
cout << endl;
cout << "l2: ";
for (li = l2.begin(); li != l2.end(); li++)
cout << *li << ' ';
cout << endl;
return 0;
}
