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From: Stefan Monnier <monnier@iro.umontreal.ca>
To: help-gnu-emacs@gnu.org
Subject: Re: About the `:variable' keyword in `define-minor-mode'
Date: Thu, 14 Feb 2013 10:02:32 -0500	[thread overview]
Message-ID: <jwvhalfkkjc.fsf-monnier+gmane.emacs.help@gnu.org> (raw)
In-Reply-To: 20130214223735.edcdea25b5a4ed018be3baca@gmail.com

> In the docstring of `define-minor-mode':
>   [...]
>   :variable PLACE [...]
>                 PLACE can also be of the form (GET . SET), where GET is
>                 an expression that returns the current state, and SET
>                 is a function that takes one argument, the new state,
>                 and sets it.

> I don't understand the meaning of GET.  The docstring says it returns
> the current state, but where will it return?

It will return it to the context?

The following expression:

     (+ 1 2)

is an expression that returns 3, and we don't care where it returns
it, really.
Does this explanation help?


        Stefan




  reply	other threads:[~2013-02-14 15:02 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-14 14:37 About the `:variable' keyword in `define-minor-mode' Xue Fuqiao
2013-02-14 15:02 ` Stefan Monnier [this message]
     [not found] ` <mailman.19937.1360854183.855.help-gnu-emacs@gnu.org>
2013-02-14 15:53   ` Michael Heerdegen
2013-02-14 15:53   ` Michael Heerdegen
  -- strict thread matches above, loose matches on Subject: below --
2013-02-14 23:50 Xue Fuqiao

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