From: "Hans Åberg" <hans.aberg-1@telia.com>
To: Hans Aberg <haberg-1@telia.com>
Cc: guile-user@gnu.org
Subject: Re: List functions
Date: Fri, 3 Dec 2010 10:20:25 +0100 [thread overview]
Message-ID: <985EC07C-7E3A-41D8-9EC0-AD799319DEA0@telia.com> (raw)
In-Reply-To: <D3044473-1119-415C-B50B-78D03C8D498C@telia.com>
On 2 Dec 2010, at 17:06, Hans Aberg wrote:
> Another problem: passing a list of length two to a function that
> takes two non-arguments. For example,
> (define h (lambda (x y) (display x) (display y)))
> and passing (list 1 2) to it.
>
> It is in the same context as before: I want to build functions like
> in Haskell
> f((1, 2), 3) where f = \((x, y), z) -> (x, y, z)
> --> (1,2,3)
I found that this is possible by:
(define f (lambda (a z) (primitive-eval (cons (lambda (x y) (+ x y
z)) a))))
Then
(f (list 1 2) 3) --> 6
The primitive "list" is important here, as shown in the examples by
Keith. So it seems one should type data-lists by adding this symbol.
But it is not available in the C-interface as symbol, so I added it in
my interface, and in fact a variation called "tuple", which is the
same as "list", only that (tuple x) --> x.
prev parent reply other threads:[~2010-12-03 9:20 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-01 16:28 List functions Hans Aberg
2010-12-01 17:35 ` Joel James Adamson
2010-12-01 17:48 ` Hans Aberg
2010-12-01 19:20 ` Keith Wright
2010-12-01 19:50 ` Hans Aberg
2010-12-01 20:26 ` Hans Aberg
2010-12-01 21:34 ` Keith Wright
2010-12-01 22:19 ` Hans Aberg
2010-12-01 22:43 ` Hans Aberg
2010-12-03 15:06 ` Hans Aberg
2010-12-01 19:51 ` Andy Wingo
2010-12-01 19:56 ` Hans Aberg
2010-12-02 9:57 ` Marco Maggi
2010-12-02 10:10 ` Marco Maggi
2010-12-02 11:31 ` Hans Aberg
2010-12-02 16:06 ` Hans Aberg
2010-12-03 9:20 ` Hans Åberg [this message]
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