From owner-sc22wg5@open-std.org Thu Jul 17 02:17:10 2008 Return-Path: X-Original-To: sc22wg5-dom6 Delivered-To: sc22wg5-dom6@open-std.org Received: by open-std.org (Postfix, from userid 521) id B16FADA74E; Thu, 17 Jul 2008 02:17:10 +0200 (CET DST) X-Original-To: sc22wg5@open-std.org Delivered-To: sc22wg5@open-std.org Received: from mail.edogawa-u.ac.jp (mail.edogawa-u.ac.jp [210.235.130.12]) by open-std.org (Postfix) with ESMTP id 28B1123A4A for ; Thu, 17 Jul 2008 02:17:00 +0200 (CET DST) Received: from mail.edogawa-u.ac.jp (localhost [127.0.0.1]) by mail.edogawa-u.ac.jp with SMTP id m6H0Gvg8012649 for ; Thu, 17 Jul 2008 09:16:57 +0900 (JST) Received: (qmail 12647 invoked by uid 0); 17 Jul 2008 09:16:57 +0900 Received: from localhost (HELO mail.edogawa-u.ac.jp) (127.0.0.1) by localhost with SMTP; 17 Jul 2008 09:16:57 +0900 Received: from TAKATA-N9.edogawa-u.ac.jp (vpn144004.edogawa-u.ac.jp [210.235.144.4]) by mail.edogawa-u.ac.jp with ESMTP id m6H0GpUX012444; Thu, 17 Jul 2008 09:16:56 +0900 (JST) Message-Id: <5.1.1.11.2.20080717090035.05ec9008@mail.edogawa-u.ac.jp> X-Sender: takata@mail.edogawa-u.ac.jp X-Mailer: QUALCOMM Windows Eudora Version 5.1J Jr5-rev2 Date: Thu, 17 Jul 2008 09:16:47 +0900 To: longb@cray.com From: TAKATA Masayuki Subject: Re: [2205jp 1510] (SC22WG5.3588) (j3.2006) OPTIONAL arguments and C interop Cc: sc22wg5@open-std.org In-Reply-To: <20080716203724.5E5B0D9F76@open-std.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: owner-sc22wg5@open-std.org Precedence: bulk Bill, Why didn't you couple each hidden flag with the corresponding optional argument to form a struct? Makki At 08/07/16 15:36 -0500, Bill Long wrote: > 2) The idea of specifying extra hidden arguments for any reason is > abhorrent. You end up with a situation where the Fortran interface and > the C prototype do not correspond even in the number of arguments. > Further, if you have an interface with many optional arguments, > intermixed with hundreds of nonoptional arguments, keeping track of > which flags go with which arguments (which the C user has to do > manually) becomes unmaintainable. Hidden arguments are fine as long as > they are always hidden. When you have to expose them, they are a bad idea. -- Takata, Masayuki: Professor Edogawa University, Nagareyama, Chiba 270-0198 Japan phone:+81-4-7152-0661ext546 fax:+81-4-7154-2490 http://www.edogawa-u.ac.jp/~takata/