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