From: Kevin Rodgers <kevinr@ihs.com>
Subject: Re: How to write specify default values for function arguments?
Date: Tue, 01 Oct 2002 17:37:10 -0600 [thread overview]
Message-ID: <3D9A31A6.2030002@ihs.com> (raw)
In-Reply-To: ancv1k$cc8jb$1@ID-60342.news.dfncis.de
Tony wrote:
> "gnuist006" <gnuist006@hotmail.com> wrote in message
> news:b00bb831.0210011045.5f29a1b4@posting.google.com...
>
>>I am looking for multiple ways for
>>specifying default values for function arguments
>>as you can do in C++.
>>
>>thanks
>>
>
> use &optional, any parameters left out will be nil.
>
> (defun foo (required-arg &optional opt1 opt2)
> (unless opt1 (setq opt1 default-val-1))
> (unless opt2 (setq opt2 default-val-2))
> ...)
Or do it the Common Lisp way:
(require 'cl)
(defun* foo (required-arg &optional (opt1 default-val-1) (opt2 default-val-2))
...)
--
<a href="mailto:<kevinr@ihs.com>">Kevin Rodgers</a>
prev parent reply other threads:[~2002-10-01 23:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-01 18:45 How to write specify default values for function arguments? gnuist006
2002-10-01 20:06 ` Tony
2002-10-01 23:37 ` Kevin Rodgers [this message]
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