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From: Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: Seeking for papers about tagged types vs access to subprograms
Date: Mon, 13 May 2013 10:30:44 -0700
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Date: 2013-05-13T10:30:44-07:00
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On 05/13/2013 06:15 AM, Robert A Duff wrote:
>
> Yes, I understood that.  I just don't think "open/closed file" is
> the best example.  Maybe something like, you can't do the "land
> aircraft" operation unless you're in the "landing gear down" state.

Sure you can. It happens all the time. There are 2 kinds of pilots who fly 
retractable-gear airplanes: those who have made a gear-up landing, and those who 
will.

> By the way, Text_IO has more design flaws than I can count without
> taking off my shoes.  ;-)

All the file handling seems poorly designed. I would only have 1 file type (or a 
few, for input, output, and input-output files), for example, with different 
levels of operations on them. It seems ridiculous to have different File_Type's 
declared for Stream, Direct, and Text access to files.

-- 
Jeff Carter
"People called Romanes, they go the house?"
Monty Python's Life of Brian
79