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From: Shark8 <onewingedshark@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Should Inline be private in the private part of a package spec?
Date: Fri, 10 Aug 2012 20:27:27 -0700 (PDT)
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Date: 2012-08-10T20:27:27-07:00
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On Friday, August 10, 2012 4:10:12 PM UTC-6, Dmitry A. Kazakov wrote:
> On Fri, 10 Aug 2012 14:35:28 -0700 (PDT), Shark8 wrote:
> 
> > Files *are* persistent objects... indeed, they are persistent across
> > power-on/power-off cycles, which makes them even more persistent than
> > anything else in the system (save the hardware).
> 
> 1. Files are weakly typed objects. One can "reinterpret" a file as one can
> reinterpret anything in C.

Not entirely correct; most of that has to do with the OS's own design. IIRC the Apple computer had a typed file-system that made the assumption that a file's type was associated w/ a particular program.

> 2. The operations defined on files do not reflect the semantics of the
> contents but the semantics of the file system, e.g. reading, writing. It is
> low-level stuff. Compare this with Integer is a higher-level language. You
> don't read integers. You would do this in an assemble language, loading
> registers, storing them into memory etc. When I say "object" I mean an
> object of some ADT, rather that objects found in Assemble language.

They should have those high-level operations, but I believe they should also have a base/common interface; that is, the OS should also be able to operate on file_type'class objects w/o worrying if it's a MIDI file or an Ada file.

Indeed there might be an entire hierarchy of classes such that mp3, midi, and avi files all have a Play method being that they all belong to the multimedia class, and midi and mp3 even more-tightly being audio-files.