On 12/16/2009 12:52 AM, John Chambers wrote:
We should probably incorporate this information in the pre-defined S4
versions of the classes, since these are basic S3 classes.
That'd be good.
Anybody see a
down side?
Meanwhile, your approach is a reasonable workaround.
John
Michael Lawrence wrote:
On Mon, Dec 14, 2009 at 11:36 PM, Romain Francois<
romain.franc...@dbmail.com> wrote:
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.
That's the way I've always done it.
Michael
Romain
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