Re: Converting Char to Enum

["David C. Hoos, Sr." <david.c.hoos.sr@ada95.com>]

I think the reason that V'alue and 'Image  are not appropriate
for the original poster's case is that his case was a subset of
the type Character.

For enumeration types in general, the use of 'Value and 'Image
are indeed.appropriate.


----- Original Message ----- 
From: "sk" <noname@myob.com>
To: <comp.lang.ada@ada.eu.org>
Sent: March 04, 2002 5:01 AM
Subject: Re: Converting Char to Enum


> Hi,
> 
> Original Post:
> 
> Lars Noschinski <lars@usenet.noschinski.de> :
> >...
> >there is a more elegant possibility.
> >                ^^^^^^^
> 
> <my suggestion snipped>
> 
> dewar@gnat.com (Robert Dewar) :
> >Ouch! From heavy to heavier!
> >An array is clearly the obvious efficient solution here.
> >                                ^^^^^^^^^
> 
> I find 'Image, 'Value and kin elegant. I will
> concede efficiency :-)
> 
> Word choice aside, are the attribute functions 
> inherently (?sp) inefficient ? Or is the example 
> of the OP a specialized and reduced case ?
> 
> type Printer_Status is (Available, Busy, Error, ...);
> 
> I think I would prefer to rely on the strategy
> outlined by the comments in "System.Val_Enum" 
> (spec, GNAT) than developing my own parser for
> every enumeration type :-).
> 
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