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

From: Duncan Murdoch <murdoch_at_stats.uwo.ca>
Date: Fri 05 Aug 2005 - 12:53:56 GMT

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.

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

>>
>>
>> ______________________________________________
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>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>

>

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https://stat.ethz.ch/mailman/listinfo/r-devel Received on Fri Aug 05 23:06:07 2005

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