流迭代器，好多死循环，有什么用，？？探讨ING－－－－2

#include <iostream>
#include <istream>
#include <vector>
// #include <algorithm>
#include <numeric>
#include <conio.h>
#include <string>
using namespace std;

int main()
{
 ostream_iterator<string> out_iter(cout,"/n");

 istream_iterator<string> cin_it(cin),end_of_steam;

    vector<string> ivec(cin_it,end_of_steam);

 while (cin_it != end_of_steam)
 {
  *out_iter ++ = *cin_it++;
 }

 getch();
 return 0;
}