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Newsgroups: comp.lang.ada
Date: Thu, 24 Jan 2019 00:13:18 -0800 (PST)
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Subject: Re: Problem with Position of the enumeration Type
From: AdaMagica <christ-usch.grein@t-online.de>
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Xref: reader01.eternal-september.org comp.lang.ada:55357
Date: 2019-01-24T00:13:18-08:00
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Am Mittwoch, 23. Januar 2019 21:22:09 UTC+1 schrieb Shark8:
> What you want is Unchecked_Conversion, to do this well you want to specify the sizes so they match up.

Tht's correct, sizes of source and target must be same.

> Type Enum_Reps is range 10..14 -- You could hide this in the private section,
>   with Size => Natural'Size;   -- and have renaming-as-a-body for the actual
>                                -- conversion functions.

But this is wrong. Enum_Reps'Size (Natural as defined) is very different from E_Test'Size.

If you want to know what might happen in this case, see

http://www.christ-usch-grein.homepage.t-online.de/AdaMagica/Prokrustes-e.html

I was bitten by this when porting Ada code from one architeture and commpiler to a different archit. and comp.

> Function Convert is new Unchecked_Conversion( E_Test, Enum_Reps );
> Function Convert is new Unchecked_Conversion( Enum_Reps, E_Test );
> 
> and then just use Convert.