Re: Declaring constants for a abstract tagged type and concrete sub classes

["Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>]

On 07/07/2015 12:51 PM, Serge Robyns wrote:
> 
> This one did the trick!  I'm marveled by the syntax and the meaning of the
> standalone tick (').  I'm wondering how I'll master these idiosyncrasies.
> I've tried to read years back the 95 RM but honestly it isn't bedtime
> lecture.  The wiki book is much readable but seems to leave quite some ground
> unexplored.  And I must admit I don't capture the essence of the difference
> between the above one and below one, except the obvious (variable vs. type)
> it puzzles me that it builds a variable out of type definition.

Yes, the ARM is not a good way to learn the language, and the wiki book leaves
some things to be desired. If you have experience with another language, I
recommend /Ada Distilled/:

http://www.adaic.org/wp-content/uploads/2010/05/Ada-Distilled-24-January-2011-Ada-2005-Version.pdf

If you'd like more of a beginner's introduction, there's /Ada 95: The Craft of
Object Oriented Programming/:

http://archive.adaic.com/docs/craft/craft.html

Both are freely available on line.

-- 
Jeff Carter
"I've seen projects fail miserably for blindly
applying the Agile catechism: we're Agile, we
don't need to stop and think, we just go ahead
and code!"
Bertrand Meyer
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