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r246136
2008 Jul 28
0
S4 classes that extend S3 classes
...;; therefore, any S3 class registered by
calling setOldClass(), and any S4 class that extends such a class, will
have the underlying S3 class available. S3 method dispatch and the
inherits() function make use of this information in the latest version
(revision r46128 of July 27, with a bug fix r46136 July 28).
So if you can live with the limitations of the first point and would
like to experiment with extending an S3 class, you're invited to try.
Note that the S3 classes _must_ be registered via setOldClass() for
extensions to work.
See ?Classes, ?setOldClass and ?S3Class for details....