inserter、back_inserter、front_inserter

分别返回三种类型的iterator：insert_iterator,back_insert_iterator,front_insert_iterator。这三种iterator被设计成允许不同的算法重写elements(例如copy方法)去替代插入操作。

// inserter example#include <iostream>#include <iterator>#include <list>using namespace std;int main () {  list<int> firstlist, secondlist;  for (int i=1; i<=5; i++)  { firstlist.push_back(i); secondlist.push_back(i*10); }  list<int>::iterator it;  it = firstlist.begin(); advance (it,3);  copy (secondlist.begin(),secondlist.end(),inserter(firstlist,it));  for ( it = firstlist.begin(); it!= firstlist.end(); ++it )      cout << *it << " ";  cout << endl;  return 0;}

Output:
1 2 3 10 20 30 40 50 4 5

必须要提到的一点是，这三种迭代器是对容器有要求的，分别要求容器提供insert，push_back，push_front方法才行。