[C++-sig] boost python references

[david stummer]

Let me simplify my question. In python you can do something like

class Seat:
    position="a"

class Window:
    seat=None

s=Seat()
s2=Seat()
w=Window()
s2 = s
w.seat=s

print s.position
print s2.position
print w.seat.position

s.position="b"

print s.position
print s2.position
print w.seat.position

and the output would be :
a
a
a
b
b
b

indicating that s2 and w.seat reference s. This is what i want. However,
when i try this with c++ classes it doesn't work, i.e.

class Seat
{
public:
    std::string position;
};

Seat::Seat()
{
    position="david";
}

class Window
{
public:
    Seat seat;
};

class_<Seat>("Seat")
    .def_readwrite("position", &Seat::position)
;

class_<Window>("Window")
    .def_readwrite("seat", &Window::seat)
;

when using similar python code above with these classes instead of the
python-defined ones, i get the following output:
a
a
a
b
b
a

The Seat object in the Window object isn't reference: it is a new object.
Why is this?
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