Interfacing D with C++ functions that take reference values

[solidstate1991 via Digitalmars-d-learn]

I need some C++ stuff, but some of the functions take reference 
values (Stuff&), and I don't know if this feature is emulated on 
D side with extern(C++) functions. While I don't have to worry 
about it with functions that are defined in the header, other 
ones and classes are a different matter.