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From: Mats Weber <Mats.Weber@elca-matrix.ch>
Subject: Re: Protected types made of ADT's, and Passive Iterators
Date: 1998/09/07
Message-ID: <35F3F885.93B3D3AB@elca-matrix.ch>#1/1
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References: <udpvdbl8uf.fsf@tanana.llnl.gov> <m3btou4urs.fsf@mheaney.ni.net>
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Organization: ELCA Matrix SA
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Reply-To: Mats.Weber@elca-matrix.ch
Newsgroups: comp.lang.ada
Date: 1998-09-07T00:00:00+00:00
List-Id: <comp.lang.ada>

Matthew Heaney wrote:

> What's wrong with this:

You need an exception handler to release the resource on a failure. Note that
almost anything can be raised in Process.

> generic
>    with procedure Process
>       (Item : in out Collection_Item;
>        Quit : in out Boolean);
> procedure Modify_Items (Collection : in out Collection_Type);
> 
> procedure Modify_Items (Collection : in out Collection_Type) is
> 
>    Quit : Boolean := False;
>    List : List_Type;
> begin
> 
>    [as before]
> 
>    Release (Collection.Guard);

  exception
     when others =>
        Release (Collection.Guard);
        raise;
> 
> end Modify_Items;