From romain.francois at dbmail.com  Tue Dec 15 08:36:46 2009
From: romain.francois at dbmail.com (Romain Francois)
Date: Tue, 15 Dec 2009 08:36:46 +0100
Subject: [Rd] S4 dispatch and S3 "connection" objects
Message-ID: <4B273C8E.9090802@dbmail.com>

Hello,

I'm trying to get S4 dispatch on S3 "connection" objects.

So I do :

setOldClass( "connection" )

and then :

setGeneric( "bling", function(object) standardGeneric( "bling" ) )
setMethod( "bling", "connection", function(object) cat( "gotcha ", 
as.integer(object), "\n" ) )

but I get :

f <- file( "blabla", open = "rb" )

 > bling( f )
Error in function (classes, fdef, mtable)  :
   unable to find an inherited method for function "bling", for 
signature "file"
 > class( f )
[1] "file"       "connection"


Am I supposed to do :

setOldClass( c("file", "connection" ) )
setOldClass( c("url", "connection" ) )

and so on for each potential S3 class, or is there another way.

Romain

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[Rd] S4 dispatch and S3 "connection" objects
Romain Francois