From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stuart Hungerford Newsgroups: gmane.lisp.guile.user Subject: Re: Idiomatic Guile for semigroup/monoid/group? Date: Tue, 4 Jan 2022 08:02:23 +1100 Message-ID: References: <7af1fd7e8bf7b0c84cdda3a431412bac31b45f18.camel@telenet.be> <8c869dfc519b7faeec5feabe9243efa25cd1668d.camel@telenet.be> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="29383"; mail-complaints-to="usenet@ciao.gmane.io" Cc: guile-user@gnu.org To: Maxime Devos Original-X-From: guile-user-bounces+guile-user=m.gmane-mx.org@gnu.org Mon Jan 03 22:03:23 2022 Return-path: Envelope-to: guile-user@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1n4UUE-0007QK-Vr for guile-user@m.gmane-mx.org; Mon, 03 Jan 2022 22:03:22 +0100 Original-Received: from localhost ([::1]:50108 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1n4UUC-00057T-Tl for guile-user@m.gmane-mx.org; Mon, 03 Jan 2022 16:03:20 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:50198) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n4UTX-00056n-3b for guile-user@gnu.org; Mon, 03 Jan 2022 16:02:40 -0500 Original-Received: from [2a00:1450:4864:20::134] (port=42991 helo=mail-lf1-x134.google.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1n4UTU-0003uR-3u for guile-user@gnu.org; Mon, 03 Jan 2022 16:02:38 -0500 Original-Received: by mail-lf1-x134.google.com with SMTP id h2so66777401lfv.9 for ; Mon, 03 Jan 2022 13:02:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=HweVYBRDp3REKu3UZdilAmyHTopIxLWTGnG5WuhUmRg=; b=R3oQviwfXLUCqMI5Fn6Q4Np2wquINHSU11it1aVbGOeMikF0q6DGucxC96d6mENNVz Murr4gO9+xh32s6yQOj3VvYOR/4YHhpgg64Hq5iXzQLq7eQBDGm/jqxw7TNWZiZW10DZ Mnpj/374/9eb0+0A5p26CSIV10p8rWaQIKMrPssW0/J43gpCMG3TgZHi2KmaIt+hKkkT txEdQeaRmv5aZTIb6ApWMhqWSL5IlOgr1RIfVkbAMnCsEqqvxO1TcK8G8AImRaB8I/od MrYGFD0f8vA0N7Oxgr3cfck5gsYklbv69O/OobXfgu6oGYpdalz5qDE9NXxjKCWkuNdQ /96Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=HweVYBRDp3REKu3UZdilAmyHTopIxLWTGnG5WuhUmRg=; b=zyqtj4L5SF4KWCmqfwnkN+BZQcSkZnFgkVAY+EL9sqg2uaoIb62TRN6b3gaPKsAlS4 VIxk5VBS8jsCG5QGbBmk5plCCkKuW0BgUAaMuxmD1LWnqa52kgWhrKOVROVm5UcUU3M2 JYtVTKsjjFiUWssPb1iyf9tvWBueloUVDnGfrlDsbPYJsu5b7xNqndmUsCDzgYndHl/H P6erFzcyMnZYDqCq6e9xqQ/3LFZGpQ5GoNqA5yliI/5KtpDg4AGhZi3e94Y2SjlplA7L K2JK+HvffT+5QdWVJ47KpTlkFSxK/PDDTfGKoGgCR1lZTuRz7+1Sx2pgm63Da2/HEVrm YTDQ== X-Gm-Message-State: AOAM531dxrWK8eAwfrSl9vP5qbZi5JjyVucz7dpoa+QJO+0MB+YML/ZI pVnfvOnO7aTnotQTLKtApQmk4MBQA/nipEeUPQ== X-Google-Smtp-Source: ABdhPJymf0GQqeAZSCDDl6TwT/B9npcu9x0Ifquq/41V7ue3R+MEi4gDcnXfis/TYs0TKSiUCd0GEqpoFs3Vduir9Xg= X-Received: by 2002:a05:6512:22ca:: with SMTP id g10mr41472369lfu.338.1641243754368; Mon, 03 Jan 2022 13:02:34 -0800 (PST) In-Reply-To: <8c869dfc519b7faeec5feabe9243efa25cd1668d.camel@telenet.be> X-Host-Lookup-Failed: Reverse DNS lookup failed for 2a00:1450:4864:20::134 (failed) Received-SPF: pass client-ip=2a00:1450:4864:20::134; envelope-from=stuart.hungerford@gmail.com; helo=mail-lf1-x134.google.com X-Spam_score_int: 6 X-Spam_score: 0.6 X-Spam_bar: / X-Spam_report: (0.6 / 5.0 requ) DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: guile-user@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Guile related discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guile-user-bounces+guile-user=m.gmane-mx.org@gnu.org Original-Sender: "guile-user" Xref: news.gmane.io gmane.lisp.guile.user:17951 Archived-At: On Mon, Jan 3, 2022 at 9:14 PM Maxime Devos wrote: > Stuart Hungerford schreef op ma 03-01-2022 om 10:46 [+1100]: > > Just out of interest, are there other multimethod/ad-hoc polymorphism > > approaches for Guile? > > I only know of GOOPS and Theme-D -- Guix also has a > =E2=80=98define-gexp-compiler=E2=80=99 but it's very ad-hoc. > > It allows defining something like > > (define (lower stuff system target) > (cond ((derivation? stuff) stuff) ; done > ((foo? stuff) (lower (lower-foo stuff system target))) > ((bar? stuff) (lower (lower-bar stuff system target))) > [...])) > > (where 'lower-stuff' converts 'stuff' into something 'lowerable'), > but in an extensible way. That's interesting -- thanks. Stu