From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: Re: Using the GNU GMP Library for Bignums in Emacs Date: Mon, 9 Jul 2018 16:25:24 -0700 Organization: UCLA Computer Science Department Message-ID: <49d8ba62-c9a5-9203-d882-8e900b441ff3@cs.ucla.edu> 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> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1531178670 4642 195.159.176.226 (9 Jul 2018 23:24:30 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 9 Jul 2018 23:24:30 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 To: Stefan Monnier , emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Tue Jul 10 01:24:25 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 1fcfW2-00015K-6C for ged-emacs-devel@m.gmane.org; Tue, 10 Jul 2018 01:24:22 +0200 Original-Received: from localhost ([::1]:44855 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fcfY9-0000zc-6E for ged-emacs-devel@m.gmane.org; Mon, 09 Jul 2018 19:26:33 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:56959) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fcfX9-0000yS-9R for emacs-devel@gnu.org; Mon, 09 Jul 2018 19:25:32 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fcfX5-0005P7-Ta for emacs-devel@gnu.org; Mon, 09 Jul 2018 19:25:31 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:43004) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fcfX5-0005Oe-Jb for emacs-devel@gnu.org; Mon, 09 Jul 2018 19:25:27 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 7BADB1600CC; Mon, 9 Jul 2018 16:25:26 -0700 (PDT) Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id YsqDoNtAxjlg; Mon, 9 Jul 2018 16:25:25 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id ADAF116050C; Mon, 9 Jul 2018 16:25:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id NEorZ5MvSnDy; Mon, 9 Jul 2018 16:25:25 -0700 (PDT) Original-Received: from [192.168.1.9] (unknown [47.154.30.119]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 6A9711600CC; Mon, 9 Jul 2018 16:25:25 -0700 (PDT) Openpgp: preference=signencrypt Autocrypt: addr=eggert@cs.ucla.edu; prefer-encrypt=mutual; keydata= xsFNBEyAcmQBEADAAyH2xoTu7ppG5D3a8FMZEon74dCvc4+q1XA2J2tBy2pwaTqfhpxxdGA9 Jj50UJ3PD4bSUEgN8tLZ0san47l5XTAFLi2456ciSl5m8sKaHlGdt9XmAAtmXqeZVIYX/UFS 96fDzf4xhEmm/y7LbYEPQdUdxu47xA5KhTYp5bltF3WYDz1Ygd7gx07Auwp7iw7eNvnoDTAl KAl8KYDZzbDNCQGEbpY3efZIvPdeI+FWQN4W+kghy+P6au6PrIIhYraeua7XDdb2LS1en3Ss mE3QjqfRqI/A2ue8JMwsvXe/WK38Ezs6x74iTaqI3AFH6ilAhDqpMnd/msSESNFt76DiO1ZK QMr9amVPknjfPmJISqdhgB1DlEdw34sROf6V8mZw0xfqT6PKE46LcFefzs0kbg4GORf8vjG2 Sf1tk5eU8MBiyN/bZ03bKNjNYMpODDQQwuP84kYLkX2wBxxMAhBxwbDVZudzxDZJ1C2VXujC OJVxq2kljBM9ETYuUGqd75AW2LXrLw6+MuIsHFAYAgRr7+KcwDgBAfwhPBYX34nSSiHlmLC+ KaHLeCLF5ZI2vKm3HEeCTtlOg7xZEONgwzL+fdKo+D6SoC8RRxJKs8a3sVfI4t6CnrQzvJbB n6gxdgCu5i29J1QCYrCYvql2UyFPAK+do99/1jOXT4m2836j1wARAQABzSBQYXVsIEVnZ2Vy dCA8ZWdnZXJ0QGNzLnVjbGEuZWR1PsLBfgQTAQIAKAUCTIByZAIbAwUJEswDAAYLCQgHAwIG FQgCCQoLBBYCAwECH In-Reply-To: Content-Language: en-US X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 131.179.128.68 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:227191 Archived-At: Stefan Monnier wrote: > Also, for purposes of cl-generic's dispatch it'd be better for type-of > to return `natnum` or `fixnum` when applicable. Isn't the issue of how finely type-of distinguishes integers separable fr= om the=20 issue of whether to have bignums? type-of could return 'natnum' now, even= =20 without bignums, but it doesn't. If we decide that type-of should return = some=20 value other than 'integer' for some integers, how would we decide what va= lue to=20 return? For example, if (natnump X) and (bignump X) both succeed, should = type-of=20 return 'natnum' or 'bignum' or both? All in all I expect Elisp would be a bit easier to use and explain if it = treats=20 'integer' as the fundamental type, and 'characterp', 'fixnump', 'bignump'= ,=20 'natnump' as predicates that succeed on only some members of that type. > it's indeed safer to just > keep returning `integer` for small integers (and probably some other va= lue > for bignums, such as `bignum`). Why the latter? That is, when would it be useful in existing code for (ty= pe-of=20 X) to return a value other than 'integer' when (integerp X) returns t?