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Re: [Help-gsl] gsl_rng_type that needs initialization and cleanup

From: Brian Gough
Subject: Re: [Help-gsl] gsl_rng_type that needs initialization and cleanup
Date: Mon, 23 Jul 2007 20:34:35 +0100
User-agent: Wanderlust/2.14.0 (Africa) Emacs/22.1 Mule/5.0 (SAKAKI)

At Fri, 20 Jul 2007 06:14:48 -0700,
Henric Jungheim wrote:
> I'm trying to implement a standard gsl_rng_type that is
> backed by a file.  The file should be opened when the
> gsl_rng is created, a clone needs to dup() the file handle
> and copy the file offset, and the file needs to be closed
> when gsl_rng_free() is called.


Thanks for your email.  There is no simple way to do that in GSL.  The
way I would recommend is to define an extended type/object in your own
code which includes a gsl_rng object in its struct.  The extended type
should have its own custom alloc/free functions, not use the gsl rng
alloc functions.

At the point where you want a plain gsl rng, extract it from the
extended type with a function defined to do that:

     rngx * rx = rngx_alloc(Tx, file, ...)
     gsl_rng * r = rngx_extract(rx);

Brian Gough
(GSL Maintainer)

Network Theory Ltd,
Publishing the GSL Manual -

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