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From: Niklas Holsti <niklas.holsti@tidorum.invalid>
Newsgroups: comp.lang.ada
Subject: Re: What would you like in Ada202X?
Date: Sun, 06 May 2012 23:47:30 +0300
Organization: Tidorum Ltd
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Date: 2012-05-06T23:47:30+03:00
List-Id: <comp.lang.ada>

On 12-05-06 22:27 , Simon Wright wrote:
> Niklas Holsti<niklas.holsti@tidorum.invalid>  writes:
 >>
 >> [ A new suggestion for extending enumerated types ]
 >
> This seems as if it could be very useful.

That's encouraging.

>> As an option, some standard word or symbol could be standardized to
>> serve the role of our "More" literal, above.
>
> "others", perhaps?

That was my first thought, but it becomes ambiguous, for example:

   type Enum is (A, B, C, others);

   E : Enum;

   case E is

   when A => ...

   when others => ...
      -- Does this mean (only) the special literal "others",
      -- or has it the classical meaning "all other literals not
      -- already mentioned"?

   end case;

In contrast, "when new" has no present meaning, so this is unambiguous:

    type Enum is (A, B, C, new);

    E : Enum;

    case E is

    when A => ...

    when new => ...

    when others => ...
       -- Meaning "when B | C =>".

    end case;

-- 
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
       .      @       .