couldn't find function "setClass"

On Tue, 16 Sep 2003, John Chambers wrote:

Jeff Gentry wrote:
Hello ...

With a new checkout of R-devel (last update was 2003-09-11) we are having
a problem (it seems to be happening to all of us here on a few different
machines) where during install/check/etc when the 'save image' happens (in
packages using 'save image'):

** save image
Error: couldn't find function "setClass"
Execution halted

This is for all packages that are using classes.

Is anyone else having this problem?
With packages that do NOT have a namespace but DO have saved images,
yes. (!)

The problem seems to be that the current version of INSTALL doesn't end
up with library(methods) in this branch (related to --vanilla ?).  One
It's not related to --vanilla, which does not change the packages loaded.
See Kurt's comment for what I believe is the true reason.

workaround seem to be to change INSTALL (or scripts/INSTALL.in) as
follows:

522c522
<       code_cmd="eval cat \"${code_file}\""
---
      code_cmd="eval echo \"library(methods)\"; cat \"${code_file}\""
to explicitly attach the library.  This may in fact be the right fix,
but I'm confused as to why this is happening now.
I don't think so: methods is currently optional and Doug's fix seems to be
to be the right one.
That (apparently) the problem arises in such a special situation is
confusing  for users.  At least for me, it's ONLY in the combination of
saved image and no namespace.

That the user does not need a require(methods) when testing the code
directly but does (sometimes) when the source code is in package source
is not a feature.  If we can avoid this complexity, that would encourage
package developers.

John
--
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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John M. Chambers                  jmc@bell-labs.com
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couldn't find function "setClass"

Thread (13 messages)