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Re: Is 't' positive?


From: Johan Bockgård
Subject: Re: Is 't' positive?
Date: Thu, 12 Apr 2007 14:08:40 +0200
User-agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.0.93 (gnu/linux)

Leo <sdl.web@gmail.com> writes:

> However, it seems legal to use 't' and they will behave like it is
> positive. So the question, is 't' positive? Is it safe to use 't' in
> this kind of functions?

(info "(elisp)Minor Mode Conventions")

     [...]
     The command should accept one optional argument. If the argument
     is `nil', it should toggle the mode (turn it on if it is off, and
     off if it is on). It should turn the mode on if the argument is a
     positive integer, the symbol `t', or a list whose CAR is one of
     those. It should turn the mode off if the argument is a negative
     integer or zero, the symbol `-', or a list whose CAR is a
     negative integer or zero. The meaning of other arguments is not
     specified.

-- 
Johan Bockgård


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