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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: best practice: error handling
Date: Sat, 11 Jun 2011 15:57:23 +0200
Organization: Ada @ Home
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Date: 2011-06-11T15:57:23+02:00
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Le Tue, 31 May 2011 22:02:42 +0200, Dmitry A. Kazakov  =

<mailbox@dmitry-kazakov.de> a =C3=A9crit:
> Again, the point is valid, but the example is not good. Zero index is =
as
> good as Index_Result. In both cases an attempt to use the index will  =

> cause
> an exception. So both return an "invalid index."
Disagree: an index is an index, not an error status; otherwise this is a=
  =

kind of special-value as special-meaning (a special meaning which outsid=
e  =

of the normal type semantic area). My experience says its dangerous,  =

because it is always hard to read that either -1 or 0 or who know what, =
 =

was intended to mean Error. Chance are that many people will read 0 as  =

meaning =E2=80=9CIndex 0=E2=80=9D.

-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D  [Ep=
igrams on  =

Programming =E2=80=94 Alan J. =E2=80=94 P. Yale University]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [Idem]
=E2=80=9Cc++; /* this makes c bigger but returns the old value */=E2=80=9D=
 [Anonymous]