[Rd] can R_do_slot_assign change slot type

Byron Ellis ellis at stat.harvard.edu
Fri Mar 25 11:09:15 CET 2005

I've done this by accident before and it works, but causes trouble down 
the line (IIRC saving and loading objects causes problems).

On Mar 21, 2005, at 10:22 PM, Vadim Ogranovich wrote:

> Hi,
> It seems that R_do_slot_assign can change the type of an S4 class slot.
> For example I have a class
> setClass("ostream", representation(id = "integer", keepOpen =
> "logical"))
> and inside a C-function I was able to assign a RAW vector to the id
> slot. Is this intentional? I remember reading somewhere that the slot
> type is guaranteed by R. Maybe this doesn't extend to C code?
> Now, in the above example I actually don't know the eventual type of 
> the
> 'id' slot, it will be set up in some C code that intializes the class
> instance. What is the right way to define the representation in such a
> case?
> Thanks,
> Vadim
> 	[[alternative HTML version deleted]]
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Byron Ellis (ellis at stat.harvard.edu)
"Oook" -- The Librarian

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