Is it possible to use slot::track with a tr1::shared_ptr instead of a boost::shared_ptr?

For example:

std::tr1::shared_ptr<MyObject> o;

typedef boost::signals2::signal<void(void)> SigType;

SigType s;

// Error: can’t convert std::tr1::shared_ptr<MyObject> to boost::weak_ptr…

s.connect(SigType::slot_type(&MyObject::function, o.get()).track(o));

According to the docs you HAVE to use boost::shared_ptr.  I’m just hoping there’s some traits specialization or something I can provide so that I can get away with using the tr1 version instead (all our code is already written with tr1).

Thanks!

-Nathan