Re: [Rd] Reorganization of packages in the R distribution

[Paul Gilbert]

Prof Brian Ripley wrote:

On Fri, 12 Dec 2003, Paul Gilbert wrote:

 

Prof Brian Ripley wrote:

   

There are a small number of CRAN packages that attempt to modify system
functions and so will need updating.  (Known examples are in dse:tframe,
gregmisc and mclust and some testing code elsewhere.)
     

Brian

What do you mean by "updating?"  In tframe I modify a few functions like

    start <- function (x, ...) if (is.Ttframed(x)) start(tframe(x), 
...) else UseMethod("start")

If that can no longer be done then this is a serious fundamental change 
that breaks all my code. I hope that is not what you mean. I'm just 
going away for a week, but will follow up when I return.
   

It's always been incorrect code, and it no longer works.  You should not
be masking system generics, as the namespace registration mechanism does
not work on your version.
 

So what would be the proper mechanism for doing something like this?  
Basically I need to do something that I believe is like multiple 
inheritance. I need to dispatch on the class of a certain part of an 
object rather than on the object itself.  (BTW, this code has worked for 
about  ten years and  I believe predates your definition of  "corrrect".)

Paul

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