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From: Jacob Sparre Andersen <sparre@nbi.dk>
Newsgroups: comp.lang.ada
Subject: Re: Newbie question
Date: 12 Mar 2009 16:03:31 +0100
Organization: Jacob Sparre Andersen
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Date: 2009-03-12T16:03:31+01:00
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stefan-lucks@see-the.signature wrote:

> Solution 2a: Use an enumeration:
> 
> type Color_T is (Black, White, None);
> 
> type Piece_T(Color: Color_T) is 
>   record
>     case Color is
>       when White => 
>         White_Piece: Piece_Type_T;
>       when Black => 
>         Black_Piece: Piece_Type_T;
>       when None =>
>         null;
>     end case;
>   end record;

Solution 2b: With defaults and a common name for pieces:

   type Square_Colour is (Black, White, None);

   type Square (Colour : Square_Colour := None) is
      record
         when Black | White =>
            Piece : Piece_Type_T; -- "Piece_Type_T" is (IMO) an ugly identifier
         when None =>
            null;
      end record;

Greetings,

Jacob
-- 
"This page inadvertently left blank."