Is it possible to get Object ** from std::unique_ptr

I try to use C function that need Object ** parameter.

I have Object pointer in std::unique_ptr structure.

Is it possible to get Object ** from std::unique_ptr<Object>?

I tried with:

std::unique_ptr<Object> obj(Object_new());
cfunction(&(obj.get()));

but it doesn't work :(

error: lvalue required as unary ‘&’ operand