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Subject: Re: I/O - exception handling
References: <bat3ee$2ec$1@ns.felk.cvut.cz> <bauf7t$tei$1@ns.omskelecom.ru>
 <bav3ln$n74$1@ns.felk.cvut.cz> <bb0503$sfb$1@ns.omskelecom.ru>
From: Ludovic Brenta <ludovic.brenta@insalien.org>
Date: 27 May 2003 20:11:05 +0200
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Date: 2003-05-27T20:11:05+02:00
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Dmitriy Anisimkov <anisimkov@yahoo.com> writes:

> declare
>    Resource : Resource_Type;
> begin
>    Open (Resource);
>    Use_This (Resource);
> exception
>    when Constraint_Error => Do_Something;
> final
>    if Is_Open (Resource) then
>      Close (Resource);
>    end if;
> end;
> 
> Is bad or not safe ?
> 
> Where block from "final" to "end" would be executed in both cases,
> normal and any-exceptional.


How different is this from:

declare
   Resource : Resource_Type;
begin
   begin
      Open (Resource);
      Use_This (Resource);
   exception
      when Constraint_Error =Do_Something;
   end;
   if Is_Open (Resource) then
     Close (Resource);
   end if;
end;

I think that this is the C++ idiom, too.

-- 
Ludovic Brenta.