In released 2.9.0, we have been seeing warnings when installing sp, for example:
Warning in .checkS3forClass(class...@classname, where, names(exts)) : Some of the superclasses in the definition of class "SpatialPoints" have apparent S3 methods. DANGER: the new class will not inherit these methods. Complain to the author of the superclass definitions. The apparent methods are "plot.Spatial", "summary.Spatial" Running R CMD check sp (or installing from CRAN) on 2.10.0 (2009-04-29 r48433) does not generate any such warnings. For us, it would be helpful if the extensions could be patched into 2.9.1 (although no user has complained, curiously enough). Roger John Chambers-2 wrote: > > Changes were committed today to the r-devel version of R to make S4 and > S3 classes (and abnormal object types such as "environment") work > together more consistently. > > Basically, S4 classes can now contain any S3 class or object type, and > should now inherit S3 methods for these. Also, the main practical > problem with defining S3 methods for other S4 classes (namely, that S4 > inheritance was not recognized) has been fixed, to the extent possible. > > See ?Methods (especially the section on S3 methods). For details (there > are quite a few) see the paper referenced there, > http://stat.stanford.edu/~jmc4/classInheritance.pdf > > Since these changes arguably fix design flaws, I would like to see them > in 2.9.1, so please test them out. For the moment, they are only in the > r-devel version. > > There can be changes to current behavior. For example, I found one > regression test for S4 methods that only worked because an apparent S3 > method, sort.list, was NOT inherited by an S4 class that contained "list". > > John > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > > -- View this message in context: http://www.nabble.com/Some-extensions-to-class-inheritance-and-method-selection-tp23245983p23295792.html Sent from the R devel mailing list archive at Nabble.com. ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
