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From: Michael Albinus <michael.albinus@gmx.de>
To: emacs-devel@gnu.org
Cc: "Mattias Engdegård" <mattiase@acm.org>
Subject: Re: master 6ebce84ff2b: Use t for non-nil default values in boolean defcustom declarations
Date: Sat, 29 Apr 2023 09:39:10 +0200	[thread overview]
Message-ID: <87ildfxhlt.fsf@gmx.de> (raw)
In-Reply-To: <20230428130816.81449C22A07@vcs2.savannah.gnu.org> ("Mattias Engdegård"'s message of "Fri, 28 Apr 2023 09:08:15 -0400 (EDT)")

Mattias Engdegård <mattiase@acm.org> writes:

Hi Mattias,

>     Use t for non-nil default values in boolean defcustom declarations
>
> +(defcustom viper-ms-style-os-p
> +  (not (not (memq system-type '(ms-dos windows-nt))))

I'm just curious. Is there an advantage in using the (not (not ...))
pattern? I would use (and ... t) instead, but perhaps your pattern is
more performant? Or is it just a personal style?

Best regards, Michael.



       reply	other threads:[~2023-04-29  7:39 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <168268729579.28551.10245924430337302769@vcs2.savannah.gnu.org>
     [not found] ` <20230428130816.81449C22A07@vcs2.savannah.gnu.org>
2023-04-29  7:39   ` Michael Albinus [this message]
2023-04-29  9:03     ` master 6ebce84ff2b: Use t for non-nil default values in boolean defcustom declarations Mattias Engdegård
2023-04-29 11:07       ` Michael Albinus
2023-04-29 11:23     ` Andreas Schwab
2023-05-02  8:03       ` Robert Pluim
2023-05-02 16:42         ` Andreas Schwab

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