From hb at stat.berkeley.edu  Thu Jul 31 16:53:17 2008
From: hb at stat.berkeley.edu (Henrik Bengtsson)
Date: Thu, 31 Jul 2008 07:53:17 -0700
Subject: [Rd] C versions of serialize/unserialize in packages
In-Reply-To: <66f3bd910807310635k19c9379dve8f44998ebc164f7@mail.gmail.com>
References: <66f3bd910807310635k19c9379dve8f44998ebc164f7@mail.gmail.com>
Message-ID: <59d7961d0807310753r6395a4c4p38f20a885d8c8581@mail.gmail.com>

Hi,

On Thu, Jul 31, 2008 at 6:35 AM, Roger D. Peng <rpeng at jhsph.edu> wrote:
> Are the functions 'R_Unserialize' and 'R_InitFileInPStream' allowed to
> be used in R packages?  I guess I'm just not clear on the implications
> of this comment in 'Rinternals.h':
>
> /* The connection interface is not yet available to packages.  To
>   allow limited use of connection pointers this defines the opaque
>   pointer type. */
>
> I have a function in the 'filehash' package that unserializes a bunch
> of objects from a file and it seems to run much faster in C than in R.
>  But I don't want to release something that uses a non-public
> function/interface.

You say "much faster".  Could this be related to what I recently observed:

July 24, 2008 thread '[Rd] serialize() to via temporary file is heaps
faster than doing it directly (on Windows)' [
https://stat.ethz.ch/pipermail/r-devel/2008-July/050256.html ].

My $0.02

/Henrik


>
> Thanks,
> -roger
> --
> Roger D. Peng | http://www.biostat.jhsph.edu/~rpeng/
>
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>



[Rd] C versions of serialize/unserialize in packages
Henrik Bengtsson