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Newsgroups: comp.lang.ada
Date: Tue, 3 Apr 2018 10:56:54 -0700 (PDT)
In-Reply-To: <p8cagc$7fb$1@franka.jacob-sparre.dk>
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Subject: Re: Ada case-statement
From: marciant@earthlink.net
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Xref: reader02.eternal-september.org comp.lang.ada:51319
Date: 2018-04-03T10:56:54-07:00
List-Id: <comp.lang.ada>

> declare
>   Selector : Day_Type renames Calculate_Day;
>   subtype Weekend_Subtype is Day_Type range Sat .. Sun;
>      -- Or use a static predicate if the range is discontiguous.
> begin
>   case Selector is
>       when Mon .. Fri =>
>          ...
>       when  Sat | Sun =>
>          ...
>          case Weekend_Subtype'(Selector) is -- A type conversion works, too.
>             when Sat =>
>                ...
>             when Sun =>
>                ...
>          end case;
>    end case;
> end;

Isn't the type conversion better withe the subtype also appearing as the first alternative:

 case Selector is
     when Mon .. Fri =>
        ...
     when Weekend_Subtype => --!!
        ...
        case Weekend_Subtype'(Selector) is
           when Sat =>
              ...
           when Sun =>
              ...
        end case;
  end case;