pkgA's NAMESPACE has
importFrom(graphics, plot)
exportClasses("A")
exportMethods("plot")
R/foo.R has
setClass("A")
setMethod("plot", "A", function(x, y, ...) {})
During R CMD INSTALL pkgA_1.0.tar.gz we are told
** preparing package for lazy loading
Creating a generic function for 'plot' from package 'graphics' in
package 'pkgA'
** help
No man pages found in package ‘pkgA’
*** installing help indices
** building package indices
** testing if installed package can be loaded
* DONE (pkgA)
pkgB has in its DESCRIPTION
Depends; pkgA
with NAMESPACE
importFrom(graphics, plot)
exportClasses("B")
exportMethods("plot")
R/bar.R has
setClass("B")
setMethod("plot", "B", function(x, y, ...) {})
During R CMD INSTALL pkgB_1.0.tar.gz we are told
** preparing package for lazy loading
** help
i.e., no implicit generic created (because graphics::plot already has an
implicit generic created, when the pkgA dependency was attached?). and also
** testing if installed package can be loaded
Error : Functions for exporting methods must have been made generic,
explicitly or implicitly; not true when loading 'pkgB' for 'plot'
Error: loading failed
Execution halted
ERROR: loading failed
which doesn't seem accurate, rather "'pkgB' does not import S4 implicit
generic for 'plot' created by 'pkgA'"
> sessionInfo()
R Under development (unstable) (2012-02-25 r58492)
Platform: x86_64-unknown-linux-gnu (64-bit)
Martin
--
Computational Biology
Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N. PO Box 19024 Seattle, WA 98109
Location: M1-B861
Telephone: 206 667-2793
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