From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Ted Zlatanov <tzz@lifelogs.com>
Cc: emacs-devel@gnu.org
Subject: Re: hash-table-{to, from}-alist
Date: Fri, 31 Jul 2009 15:03:48 -0400 [thread overview]
Message-ID: <jwviqh8r81p.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87iqh84uao.fsf@lifelogs.com> (Ted Zlatanov's message of "Fri, 31 Jul 2009 12:49:19 -0500")
SM> Of, course there's always another (more reliable) way:
SM> (hash-table-p (read-from-string (prin1-to-string (make-hash-table))))
> That was my first thought, but it seemed like a really hacky approach
> when featurep exists.
It's definitely not hacky. It's more reliable (tho it probably requires
a bit of fiddling such as wrapping it in ignore-errors) and tests more
directly the presence of the feature you need.
The advantage of the featurep call is that it's likely to be
more efficient (which only matters if the test is made within a loop,
of course).
Stefan
next prev parent reply other threads:[~2009-07-31 19:03 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-28 1:01 print hash table to disk and reread in hash table Xah
2008-08-28 5:21 ` Thierry Volpiatto
[not found] ` <mailman.17732.1219901096.18990.help-gnu-emacs@gnu.org>
2008-08-28 5:27 ` Xah
2008-08-28 6:17 ` Thierry Volpiatto
2008-08-28 14:03 ` Ted Zlatanov
2008-08-28 18:10 ` Eli Zaretskii
[not found] ` <mailman.17796.1219947087.18990.help-gnu-emacs@gnu.org>
2008-08-29 14:06 ` Ted Zlatanov
2008-08-29 14:52 ` Eli Zaretskii
[not found] ` <mailman.17897.1220021571.18990.help-gnu-emacs@gnu.org>
2008-08-29 18:10 ` Ted Zlatanov
2008-08-30 5:18 ` tomas
2008-08-30 9:17 ` Ted Zlatanov
2008-08-30 12:03 ` tomas
2008-11-17 17:15 ` Ted Zlatanov
2008-11-19 21:37 ` hash-table-{to, from}-alist (was: print hash table to disk and reread in hash table) Ted Zlatanov
2008-11-19 21:57 ` hash-table-{to, from}-alist Glenn Morris
2008-11-20 19:07 ` Ted Zlatanov
2008-11-21 22:02 ` Stefan Monnier
2008-11-21 22:22 ` Ted Zlatanov
2008-11-22 3:18 ` Stefan Monnier
2008-11-22 5:45 ` tomas
2008-11-22 12:27 ` Stephen J. Turnbull
2008-11-22 15:21 ` tomas
2008-11-22 17:38 ` Stephen J. Turnbull
2008-11-24 15:44 ` Richard M Stallman
2008-11-24 16:58 ` Stefan Monnier
2008-11-24 17:21 ` Ted Zlatanov
2008-11-25 1:50 ` Stephen J. Turnbull
2008-11-25 17:33 ` Ted Zlatanov
2008-11-25 23:50 ` Ted Zlatanov
2008-11-26 1:46 ` Stefan Monnier
2008-11-26 2:16 ` David De La Harpe Golden
2008-11-26 3:48 ` Stefan Monnier
2008-11-26 5:46 ` David De La Harpe Golden
2008-11-26 2:29 ` Stephen J. Turnbull
2008-11-26 3:34 ` David De La Harpe Golden
2008-11-26 16:06 ` Ted Zlatanov
2008-11-26 18:10 ` Stefan Monnier
2008-11-26 20:37 ` Ted Zlatanov
2008-11-26 21:16 ` Ted Zlatanov
2008-12-01 22:01 ` Ted Zlatanov
2008-12-02 0:13 ` Andreas Schwab
2008-12-02 14:27 ` Ted Zlatanov
2008-12-02 21:59 ` Stefan Monnier
2008-12-02 22:20 ` Andreas Schwab
2008-12-02 20:56 ` Ted Zlatanov
2008-12-02 21:27 ` Andreas Schwab
2008-12-02 21:58 ` Stefan Monnier
2008-12-03 19:25 ` Ted Zlatanov
2008-12-04 2:05 ` Stefan Monnier
2008-12-04 6:23 ` Stephen J. Turnbull
2008-12-04 6:34 ` Miles Bader
2008-12-04 9:08 ` Andreas Schwab
2008-12-04 13:18 ` Stefan Monnier
2008-12-04 15:02 ` Ted Zlatanov
2008-12-04 19:34 ` Stefan Monnier
2008-12-04 19:57 ` Ted Zlatanov
2009-07-30 18:24 ` Ted Zlatanov
2009-07-30 19:08 ` Chong Yidong
2009-07-30 19:22 ` Ted Zlatanov
2009-07-30 19:40 ` Chong Yidong
2009-07-30 21:04 ` Stefan Monnier
2009-07-31 1:30 ` Stefan Monnier
2009-07-31 17:49 ` Ted Zlatanov
2009-07-31 19:03 ` Stefan Monnier [this message]
2009-07-31 20:25 ` Ted Zlatanov
2009-08-01 2:22 ` Stephen J. Turnbull
2009-08-01 11:35 ` Chong Yidong
2009-08-03 14:53 ` Ted Zlatanov
2009-08-05 9:20 ` Ted Zlatanov
2009-08-05 13:48 ` Chong Yidong
2009-08-05 16:48 ` Ted Zlatanov
2009-08-06 16:30 ` Stefan Monnier
2009-08-06 16:47 ` Ted Zlatanov
2009-08-08 18:36 ` Chong Yidong
2009-08-06 10:13 ` Dan Nicolaescu
2009-08-06 16:58 ` Florian Beck
2009-08-03 21:23 ` Stefan Monnier
2009-07-31 18:10 ` Ted Zlatanov
2008-11-27 0:24 ` Stephen J. Turnbull
2008-12-01 21:53 ` Ted Zlatanov
2008-12-02 9:05 ` Stephen J. Turnbull
2008-12-02 14:21 ` Ted Zlatanov
2008-12-02 15:54 ` Stephen J. Turnbull
2008-12-02 16:10 ` Ted Zlatanov
2008-12-02 16:54 ` Stephen J. Turnbull
2008-12-02 22:19 ` Stefan Monnier
2008-12-02 23:27 ` Ted Zlatanov
2008-11-26 19:44 ` Davis Herring
2008-11-26 20:41 ` Ted Zlatanov
2008-11-25 2:57 ` Stefan Monnier
2008-11-25 7:02 ` Stephen J. Turnbull
2008-11-22 6:07 ` Miles Bader
2008-11-22 15:27 ` tomas
2008-11-22 18:57 ` Ted Zlatanov
2008-08-28 8:36 ` print hash table to disk and reread in hash table Niels Giesen
2008-10-10 20:38 ` harven
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