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From: braver <deliverable@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: OO Style with Ada Containers
Date: Fri, 23 Nov 2007 14:25:30 -0800 (PST)
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Date: 2007-11-23T14:25:30-08:00
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Very ineteresting -- Matt, can you pls elucidate these idioms below?

On Nov 19, 5:24 am, Matthew Heaney <matthewjhea...@earthlink.net>
wrote:

>    type Scanner (<>) is tagged limited private;

What does (<>) say here -- that the type is unconstrained?

> private
>
>    type Handle (S : not null access Scanner) is limited null record;
>
>    type Scanner (Last : Natural) is tagged limited record
>       H          : Handle (Scanner'Access);
>       Line       : String (1 .. Last);
>       Word_First : Positive;
>       Word_Last  : Natural;
>    end record;
>
> end Scanners;
>    function Scan (Line : String) return Scanner is
>    begin
>       return S : Scanner (Line'Length) do
>         S.Line := Line;
>         -- S.Word_First := 1;
>         S.Word_Last := 0;
>         Next (S);
>       end return;
>    end Scan;


>    function Word (S : Scanner) return String is
>       L : constant Positive := S.Word_Last - S.Word_First + 1;
>
>    begin
>       return Result : String (1 .. L) do
>         Result := S.Line (S.Word_First .. S.Word_Last);
>         Next (S.H.S.all);
>       end return;
>    end Word;

What's the logic behind the definition and usage of the Handle H
throughout?

Cheers,
Alexy