LazyLoad changes the class of objects
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
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