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Newsgroups: comp.lang.ada
Date: Sat, 6 Jan 2018 18:05:23 -0800 (PST)
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Subject: Re: stopping a loop iteration without exiting it
From: Matt Borchers <mattborchers@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:49797
Date: 2018-01-06T18:05:23-08:00
List-Id: <comp.lang.ada>

On Saturday, January 6, 2018 at 5:04:08 PM UTC-5, J-P. Rosen wrote:
> Le 06/01/2018 =C3=A0 01:26, Matt Borchers a =C3=A9crit=C2=A0:
> > begin
> > ...
> > exception
> >   when EX1 =3D> ...
> >   when EX2 =3D> ...
> >   when others =3D> ...
> > finally
> > ...
> > end;
> >=20
> > This would allow programmers to handle common cleanup operations that w=
ould otherwise have to be duplicated in every exception case.
> Actually, it is possible (ever since Ada 83!) to have a common part for
> all exception handlers, and then different handlings according to the
> exception:
>=20
> exception
>    when others =3D>
>       begin
>          Common_Part;
>          raise;
>       exception
>          when EX1 =3D> ...
>          when EX2 =3D> ...
>          ...
>       end;
> end
>=20
> --=20
> J-P. Rosen
> Adalog
> 2 rue du Docteur Lombard, 92441 Issy-les-Moulineaux CEDEX
> Tel: +33 1 45 29 21 52, Fax: +33 1 45 29 25 00
> http://www.adalog.fr

Interesting, but to get the common part to execute AFTER the exception hand=
ling looks very strange and begs for a better solution that to re-raise the=
 exception in the first line of the exception handler.

exception
   when others =3D>
      begin
         raise;
      exception
         when EX1 =3D> ...
         when EX2 =3D> ...
         ...
      end;
      Common_Part;
end;