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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Variant record with multiple discriminants?
Date: Sat, 28 Oct 2017 20:48:49 +0200
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Xref: news.eternal-september.org comp.lang.ada:48617
Date: 2017-10-28T20:48:49+02:00
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On 2017-10-28 19:05, Victor Porton wrote:
> Ada does not support variant records whose fields presence depends on
> multiple discriminants, does it?

    type T (A : Boolean; B : Boolean) is record
       case A is
          when True =>
             case B is
                when True =>
                   X : Integer;
                when False =>
                   Y : Float;
             end case;
          when False =>
             Z : String (1..20);
       end case;
    end record;

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de