From: Marius Vollmer <mvo@zagadka.de>
Subject: Re: list versus apply
Date: Mon, 06 Jun 2005 00:11:35 +0300 [thread overview]
Message-ID: <87u0kcjypk.fsf@zagadka.de> (raw)
In-Reply-To: <87hdgck0an.fsf@zip.com.au> (Kevin Ryde's message of "Mon, 06 Jun 2005 06:37:20 +1000")
Kevin Ryde <user42@zip.com.au> writes:
> Marius Vollmer <mvo@zagadka.de> writes:
>>
>> (define (list . args) args)
>>
>> is an acceptable definition of list. Is it not?
>
> Yep, because args is of course a fresh list when calling a lambda, but
> it looks like primitives (C code) aren't called with a copied list
> like that.
Ahh, I see. R5RS says: "The value stored in the binding of the last
variable will be a newly allocated list of the actual arguments..." I
think I was confusing this with Common Lisp, which says: "The value of
a rest parameter is permitted, but not required, to share structure
with the last argument to apply."
> (I guess having primitives like that makes some sense, only a few are
> interested in modifying or re-using their input "rest" list.)
We need to document this difference between Scheme functions and C
primitives, I'd say.
--
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next prev parent reply other threads:[~2005-06-05 21:11 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-20 22:22 list versus apply Kevin Ryde
2005-04-22 23:45 ` Kevin Ryde
2005-06-05 17:30 ` Marius Vollmer
2005-06-05 20:37 ` Kevin Ryde
2005-06-05 21:11 ` Marius Vollmer [this message]
2005-06-05 21:21 ` Kevin Ryde
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