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Re: print hash table to disk and reread in hash table


From: Ted Zlatanov
Subject: Re: print hash table to disk and reread in hash table
Date: Thu, 28 Aug 2008 09:03:53 -0500
User-agent: Gnus/5.110011 (No Gnus v0.11) Emacs/23.0.60 (gnu/linux)

On Wed, 27 Aug 2008 22:27:47 -0700 (PDT) Xah <address@hidden> wrote: 

X> but is there a function or lib to save hashtable to disk? i.e.
X> sometimes called serializing?

No.  It's easy to convert a hashtable to a list, and Emacs makes it easy
to serialize a list, so that's what people do.  I have code in
gnus-registry.el (copied in part from the way Gnus saves its newsrc
file) to do this.  The combination of two easy things is not,
unfortunately, simple anymore.

I like the (puthash ...) approach suggested by Thierry Volpiatto but
it's a lot of function calls for a large hashtable (which the Gnus
registry creates).  So I'm not sure it's the right approach either.

BBDB has a similar problem; it saves vectors instead of lists.

If there's no library for serialization, it should definitely be
written.  Emacs Lisp has only a few basic data types, and not all of
them have to be supported anyhow.

Ted


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