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From: richard <catbird.island@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: What's wrong with C++?
Date: Fri, 18 Feb 2011 03:34:13 -0800 (PST)
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Date: 2011-02-18T03:34:13-08:00
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On Feb 17, 3:52=A0am, Georg Bauhaus <rm-host.bauh...@maps.futureapps.de>
wrote:
> On2/17/11 12:04 PM, J-P. Rosen wrote:
>
> > Le 17/02/2011 00:35, Peter C. Chapin a crit :
> >> A macro defined in someheader.h might change the meaning of the
> >> declarations in someotherheader.h.
> > And especially the following one:
> > #define private public
>
> > Great for those who think that information hiding is a nuisance!
>
> It is good to know that source code transformation
> can change the meaning of source text. =A0I don't think
> this argument will convince. =A0Is there substantial evidence
> of programs that #define private to be public? Might be.
> The change is a conventional trick to use with introspective
> languages, and useful.
>
> But anyway, the argument is easily refuted as by
> firing this riposte:
>
> procedure Safe is
>
> =A0 =A0 =A0function "+" (Left, Right: Integer) return Integer is
> =A0 =A0 =A0begin
> =A0 =A0 =A0 =A0 =A0return 0;
> =A0 =A0 =A0end "+";
>
> =A0 =A0 =A0A : array (Integer range 1 .. 2) of Integer;
> begin
> =A0 =A0 =A0for K in A'Range loop
> =A0 =A0 =A0 =A0 =A0A (A'First + K - 1) :=3D 666;
> =A0 =A0 =A0end loop;
> end Safe;
>
> Make "+" a little more obscure (if possible) and have
> a proponent of Ada look for the error...
>
> Or talk about the possibility (or not) of changing the
> definition of Integer temporarily to a debugging version
> of Integer whose operations we can trace.
We do not use predefined type integer in production code.  If you
define your own constrained integer type, this is not likely to be a
problem.