From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00, REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4 Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!mx02.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: Running a preprocessor from GPS? Date: Thu, 30 Jul 2015 08:08:02 +0200 Organization: cbb software GmbH Message-ID: References: <2df4698f-4c8e-457c-822d-209cb2f8ab5e@googlegroups.com> <014427b1-ff7a-4a69-82e6-0330af77ed96@googlegroups.com> Reply-To: mailbox@dmitry-kazakov.de NNTP-Posting-Host: ChlmA4XFxcJoDoqGdDSflw.user.speranza.aioe.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@aioe.org User-Agent: 40tude_Dialog/2.0.15.1 X-Notice: Filtered by postfilter v. 0.8.2 Xref: news.eternal-september.org comp.lang.ada:27166 Date: 2015-07-30T08:08:02+02:00 List-Id: On Wed, 29 Jul 2015 15:32:20 -0700 (PDT), EGarrulo wrote: > If Ada offered runtime typing by means of a type `Any`, then `Printf` > could be trivially written as: > > type Printf_Arguments is array (Positive range <>) of Any; > > procedure Printf (Format : String; Arguments : Printf_Arguments); This is pretty much useless because Any has no operations. It should be: type Printable_Sequence is array (Positive range <>) of Printable'Class; With Printable having the primitive operation Image. In fact no run-time typing is required for dealing with that except three things: 1. MI 2. Ad-hoc supertypes. Some existing types might have no Printable ancestor, you will have to add it later. 3. Flattening arrays/record (that is if you wanted to drop brackets around the array aggregate in the calls to Printf). -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de