Exam CPP topic 2 question 139 discussion

What will happen when you attempt to compile and run the code below, assuming that you enter the following sequence: 1 2 3 4 quit<enter>?
#include <iostream>
#include <string>
#include <list>
#include <algorithm>

using namespace std;

template<class T>struct Out {
ostream & out;
Out(ostream & o): out(o){}
void operator() (const T & val ) {out<<val<<" "; } };

int main ()
{
list<string> l;
while(cin.good())
{
string s;
cin>>s;
if (s == "quit") break;
l.push_back(s);
}
for_each(l.begin(), l.end(), Out<string>(cout));
return 0;
}
Program will output: