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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: What is your opinion on Global Objects?
Date: Tue, 18 Nov 2014 09:54:50 +0100
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Date: 2014-11-18T09:54:50+01:00
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On Mon, 17 Nov 2014 17:36:44 -0800, Hubert wrote:

[...]
> So my question is basically, is it OK to make these entities available 
> through global access variables, or should they all be passed as 
> arguments to function calls?

You would have some "Context" or "World" object and pass it along.

> We all know global objects are bad (not to 
> mention that theorists heftily denounce the Singleton Pattern as bad,

Yes, if misused for unrelated purposes, like module initialization etc.

And I doubt that "World" object is really a singleton. It is always better
to expose all stateful parameters rather than hiding them. E.g.

   Put_Line (Standard_Output, ...);

vs.

   Put_Line (...);

Later you might decide to use a different file for the output.
 
-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de