From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Helmut Eller Newsgroups: gmane.emacs.devel Subject: Re: Using the GNU GMP Library for Bignums in Emacs Date: Tue, 10 Jul 2018 07:32:07 +0200 Message-ID: References: <29f933ac-a6bf-8742-66a7-0a9d6d3e5a88@disroot.org> <83bmecy6fx.fsf@gnu.org> <0d3175d8-d996-651e-b221-71978bde3a65@cs.ucla.edu> <87tvpdnzgy.fsf@tromey.com> <4c2a814f-c254-29e5-39cf-11b5f2e5c9c8@cs.ucla.edu> <49d8ba62-c9a5-9203-d882-8e900b441ff3@cs.ucla.edu> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1531200633 20155 195.159.176.226 (10 Jul 2018 05:30:33 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 10 Jul 2018 05:30:33 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Tue Jul 10 07:30:29 2018 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fclEJ-00052w-NF for ged-emacs-devel@m.gmane.org; Tue, 10 Jul 2018 07:30:27 +0200 Original-Received: from localhost ([::1]:45814 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fclGL-0000wj-PB for ged-emacs-devel@m.gmane.org; Tue, 10 Jul 2018 01:32:33 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:35502) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fclG7-0000si-Fb for emacs-devel@gnu.org; Tue, 10 Jul 2018 01:32:20 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fclG4-00013Z-CD for emacs-devel@gnu.org; Tue, 10 Jul 2018 01:32:19 -0400 Original-Received: from [195.159.176.226] (port=45667 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fclG3-000137-Pk for emacs-devel@gnu.org; Tue, 10 Jul 2018 01:32:16 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1fclDu-0004gy-DP for emacs-devel@gnu.org; Tue, 10 Jul 2018 07:30:02 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 14 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:oIdk23oDz/6rru9T/80O3q24moE= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:227200 Archived-At: On Mon, Jul 09 2018, Stefan Monnier wrote: > In general, we'd want type-of to return the "most precise" type, so > you could argue that `natnum` is the better option. Note that `natnum` > is not a valid type in CommonLisp, tho, so `fixnum` would probably be > a better option (especially if you want to consider positive bignums as > natnums, in which case natnum is not a subtype of fixnum). The most precise type for 5 would be (eql 5) or (integer 5 5). But I guess for generic function dispatch it would more useful to have something like a "representation type". Or even "type codes" that are ordered in some fashion. Helmut