File reading problem

Hi! I have a program with a class that needs to be able to write
itself to a file in clear text format. The file has two integers and
vector of struct objects. The struct has a string that can consist of
one or more words and a few integers. I'm able to create the file
properly, as confimed by viewing it in a text editor, but something
goes wrong when I tried to read it. I've made a test program
illustrating the problem:

#include <fstream>
#include <iostream>
#include <string>
#include <vector>

using namespace std;

struct s_t
{
   s_t() {}
   s_t(const string& si, int xi, int yi) : s(si), x(xi), y(yi) {}
   string s;
   int x, y;

   friend ostream& operator<<(ostream& os, const s_t& rhs);
   friend istream& operator>>(istream& is, s_t& rhs);
};

ostream&
operator<<(ostream& os, const s_t& rhs)
{
   os << rhs.s << endl;
   os << rhs.x << ' ' << rhs.y;

   return os;
}

istream&
operator>>(istream& is, s_t& rhs)
{
   getline(is, rhs.s);

   is >> rhs.x >> rhs.y;

   return is;
}

void
readit()
{
   int x = 0, y = 0;
   vector<s_t> vec;

   ifstream in("foo.txt");

   in >> x >> y;

   {
      s_t temp;

      while (in >> temp) vec.push_back(temp);
   }

   in.close();

   cout << x << ' ' << y << endl;
   cout << vec.size() << endl;
   for (unsigned int i = 0; i < vec.size(); i++)
      cout << vec.at(i) << endl;
}

int
main()
{
   int x = 4711, y = 1337;
   vector<s_t> vec;

   vec.push_back(s_t("foo bar", 33, 22));
   vec.push_back(s_t("bar baz", 11, 99));

   ofstream out("foo.txt");

   out << x << ' ' << y << endl;
   for (unsigned int i = 0; i < vec.size(); i++)
   {
      out << vec.at(i);

      if (i < vec.size() - 1)
         out << endl;
   }

   out.flush();
   out.close();

   readit();
}

When I run it, I get this output:
4711 1337
0

so it reads the first two numbers ok but reading the s_t objects
doesn't work because the vector is empty afterwards...

Any help appreciated.

- E