I'd suspect that the Imports: line in DESCRIPTION imports the full namespaces,
including conflicting items, on top of importFrom items. Does it not help to
use Depends: instead?
-pd
On Jun 5, 2013, at 18:48 , Jombart, Thibaut wrote:
>
> Dear all,
>
> It is my understanding that using 'importFrom' in the NAMESPACE of a package
> allows to avoid conflicts between different packages defining objects with
> identical names. However, I can still see conflicts while loading the package
> using 'library'.
>
> Here is a toy example, with a package 'foo' importing 'as.igraph' from the
> igraph package, and 'nj' from ape.
>
> 'foo' uses the following DESCRIPTION file:
> ----------------------
> Package: foo
> Version: 0.0-0
> Date: 2013/06/04
> Title: foo
> Author: John Doe
> Maintainer: John Doe <j...@nowhere.org>
> Imports: igraph, ape
> Description: just a test.
> License: GPL (>=2)
> LazyLoad: yes
> ----------------------
>
> And the following NAMESPACE:
> ----------------------
> ## Export all names
> exportPattern(".")
>
> ## Export all classes
> exportClassPattern(".")
>
> ## Import all packages listed as Imports or Depends
> importFrom(igraph, as.igraph)
> importFrom(ape, nj)
> ----------------------
>
> The check (R 3.0.1) passes without warnings, but then when loading the
> package:
>> library(foo)
> Warning messages:
> 1: replacing previous import ‘as.igraph’ when loading ‘ape’
> 2: replacing previous import ‘edges’ when loading ‘ape’
>>
>
> I would have assumed only ape::nj and igraph::as.igraph would be imported
> when loading 'foo', so this conflict should not occur.
>
> There is probably something simple I have missed as I have just began to pay
> attention to NAMESPACES recently. Reading this post:
> http://stackoverflow.com/questions/8637993/better-explanation-of-when-to-use-imports-depends
> clarified things a bit, but I still don't understand the warning above.
>
> Any clarification will be much appreciated.
>
> All the best
>
> Thibaut
>
> --
> ######################################
> Dr Thibaut JOMBART
> MRC Centre for Outbreak Analysis and Modelling
> Department of Infectious Disease Epidemiology
> Imperial College - School of Public Health
> St Mary’s Campus
> Norfolk Place
> London W2 1PG
> United Kingdom
> Tel. : 0044 (0)20 7594 3658
> t.jomb...@imperial.ac.uk
> http://sites.google.com/site/thibautjombart/
> http://adegenet.r-forge.r-project.org/
> ______________________________________________
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd....@cbs.dk Priv: pda...@gmail.com
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