Problem with boost::shared_ptr auto conversion

Hello,
I'm pretty new to luabind and got a problem with boost::shared_ptr:

If you have the following functions:
Foo getFoo();
void setFoo(boost::shared_ptr<Foo> foo);

which are registered with luabind:
     luabind::class_<Foo, boost::shared_ptr<Foo> >("Foo"),
     luabind::def("getFoo", &getFoo),
     luabind::def("setFoo", &setFoo)

this lua-code doesn't work:
setFoo(getFoo());

Why? All other conversions are handled completely automatically (which is
pretty nice).
Have I missed something?


Thanks

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