From: pjb@informatimago.com (Pascal J. Bourguignon)
To: help-gnu-emacs@gnu.org
Subject: Re: Hash-tables containing references to hash-tables
Date: Mon, 23 Nov 2009 15:10:44 +0100 [thread overview]
Message-ID: <873a45e3h7.fsf@galatea.local> (raw)
In-Reply-To: 7a116be4-52cb-482d-b555-09bc4950d5f7@31g2000vbf.googlegroups.com
Nordlöw <per.nordlow@gmail.com> writes:
> Is it possible for a hash-table to contain a *reference* to another
> hash-table, similar to how we can build arbitrary graphs using conses/
> lists and setf?
Yes.
There is not automatic copy ever done in lisp. You have to
explicitely copy the structures (such as cons, copy-list,
copy-hash-table, copy-my-struct, etc) you use if you want copies (or
use a function that explicitely copies the input data like append does
for all lists but the last). And for some types, there are even no
predefined copier function!
--
__Pascal Bourguignon__
prev parent reply other threads:[~2009-11-23 14:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-23 11:12 Hash-tables containing references to hash-tables Nordlöw
2009-11-23 12:41 ` tomas
2009-11-23 14:10 ` Pascal J. Bourguignon [this message]
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