Re: [Rd] LazyLoad changes the class of objects

From: Luke Tierney <luke_at_stat.uiowa.edu>
Date: Wed, 17 Oct 2007 07:59:39 -0500 (CDT)

Yes, attributes are not preserved, though why that should matter given the frequent strong recommendations in this list against using attributes on environments or other reference objects is beyond me. More importantly, locking and active bindings are not preserved either. Will look into fixing this this 2.7.

luke

On Fri, 12 Oct 2007, Gabor Grothendieck wrote:

> Consider a package that this DESCRIPTION file:
>
> ---
> Package: tester
> Version: 0.1-0
> Date: 2007-10-12
> Title: Prototype object-based programming
> Author: Gabor Grothendieck
> Maintainer: Gabor Grothendieck <ggrothendieck_at_gmail.com>
> Description: test
> LazyLoad: true
> Depends: R (>= 2.6.0)
> License: GPL2
> ---
>
> and a single subdirectory R containing tester.R which contains two lines:
>
> ---
> e <- new.env()
> class(e) <- c("x", "environment")
> ---
>
> Now issue these commands:
>
>> library(tester)
>> class(tester::e)
> [1] "environment"
>
>> R.version.string # Windows Vista
> [1] "R version 2.6.0 Patched (2007-10-08 r43124)"
>
>
> Note that the class of e was changed from what we set it to !!!
>
> On the other handn, if we omit LazyLoad: true from the DESCRIPTION file
> then it retains its original class.
>
>> # removed LazyLoad: true line from DESCRIPTION and reinstall pkg
>> # now its ok
>> library(tester)
>> class(tester::e)
> [1] "x" "environment"
>
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>

-- 
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa                  Phone:             319-335-3386
Department of Statistics and        Fax:               319-335-3017
    Actuarial Science
241 Schaeffer Hall                  email:      luke_at_stat.uiowa.edu
Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu

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Received on Wed 17 Oct 2007 - 13:12:59 GMT

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