Re: [Rd] object.size() bug?

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Fri 05 Aug 2005 - 13:46:42 GMT

On Fri, 5 Aug 2005, Duncan Murdoch wrote:

> On 8/5/2005 8:39 AM, Roger D. Peng wrote:
>> Would it make sense for 'object.size()' to do the same thing for
>> external pointers as it does for environments?
>
> I would think so. For those who haven't looked, this returns the size
> of the SEXP for the environment and its attributes, but does not attempt
> to work out the size of the contents of the environment. This makes
> sense, because environments are references. External pointers are also
> references, so their object size should be the size of the pointer
> (which is probably 28 bytes; R pointers carry a lot of baggage!), with
> no attempt to say anything about the external thing they point to.

I think it might also make sense for the code to warn this had been done.

>
> Duncan Murdoch
>
>
>> -roger
>>
>> Martin Maechler wrote:
>>>>>>>> "Paul" == Paul Roebuck <roebuck@odin.mdacc.tmc.edu>
>>>>>>>> on Thu, 4 Aug 2005 00:29:03 -0500 (CDT) writes:
>>>
>>>
>>> Paul> Can someone confirm the following as a problem:
>>>
>>> Yes, I can. No promiss for a fix in the very near future
>>> though.
>>>
>>> Martin Maechler, ETH Zurich
>>>
>>>
>>>>> Can someone confirm the following as a problem:
>>>>>
>>>>> R> setClass("Foo", representation(.handle = "externalptr"))
>>>>> R> object.size(new("Foo"))
>>>>> Error in object.size(new("Foo")) : object.size: unknown type 22
>>>>> R> R.version.string
>>>>> [1] "R version 2.1.1, 2005-06-20"
>>>>>
>>>>> R-2.1.1/src/include/Rinternals.h
>>>>> #define EXTPTRSXP 22 /* external pointer */
>>>>>
>>>>> R-2.1.1/src/main/size.c:
>>>>> objectsize(SEXP s) has no case for external pointers
>>>
>>>
>>> ______________________________________________
>>> R-devel@r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>>
>>
>
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>
>

-- 
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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Received on Fri Aug 05 23:50:02 2005

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