From: Stefan Monnier <monnier@iro.umontreal.ca>
To: joakim@verona.se
Cc: emacs-devel@gnu.org
Subject: Re: How to make a new pseudovector type?
Date: Mon, 18 Jul 2011 10:19:33 -0400 [thread overview]
Message-ID: <jwvaacb3c9b.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <m34o2jr8vs.fsf@verona.se> (joakim@verona.se's message of "Mon, 18 Jul 2011 15:55:19 +0200")
>>> In the xwidget branch I use PVEC_OTHER = 0x400000 from enum pvec_type
>>> to represent an xwidget.
>> Don't: create a new PVEC_XWIDGET instead.
> Cool, but the bitmask is fully utilized. Can I expand the bitmask?
Of course.
> (I need 2 types.) if so, why is it so small to begin with?
It's made as large as needed. Actually, it largely doesn't need to be
a bitmask. Last time I looked it's only used at one or two places to
make it marginally quicker to check if something is one of some
particular subset of the possible pseudo-vectors.
Stefan
prev parent reply other threads:[~2011-07-18 14:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-15 10:31 How to make a new pseudovector type? joakim
2011-07-18 13:46 ` Stefan Monnier
2011-07-18 13:55 ` joakim
2011-07-18 14:19 ` Stefan Monnier [this message]
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