From romain at r-enthusiasts.com  Sat May 29 13:21:38 2010
From: romain at r-enthusiasts.com (Romain Francois)
Date: Sat, 29 May 2010 13:21:38 +0200
Subject: [Rd] S4 dispatch for .DollarNames (utils)
Message-ID: <4C00F8C2.4060508@r-enthusiasts.com>

Hello,

I'm trying to make .DollarNames generic and implement a method for it in 
a package. .DollarNames is the function that is now called to get 
completion possibilities.

My R code looks like this:

setGeneric( ".DollarNames" )

setClass("track",
          representation(x="numeric", y="numeric"))
## A class extending the previous, adding one more slot
setClass("trackCurve",
     representation(smooth = "numeric"),
     contains = "track")

setMethod( ".DollarNames", signature( x = "track", pattern = "character" 
), function(x, pattern){
	grep( pattern, c("foo", "bar"), value = TRUE )	
} )


and the NAMESPACE :

import( utils )
exportMethods( .DollarNames )
exportClasses( track, trackCurve )


When I load the package, I can call .DollarNames explicitely :

 > require( foo )
 > x <- new( "trackCurve", x = 1:10, y = 1:10, smooth = 1:10 )
 > .DollarNames( x, "f" )
[1] "foo"

but completion does not work :

 > x$f<TAB>
x$


What do I miss ?

I've uploaded foo here : http://addictedtor.free.fr/misc/rcpp/foo_1.0.tar.gz

Romain


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Romain Francois
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[Rd] S4 dispatch for .DollarNames (utils)
Romain Francois