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Newsgroups: comp.lang.ada
Subject: Re: Easy question about Character manipulation
From: Georg Bauhaus <bauhaus@arcor.de>
In-Reply-To: <C1E4472E.91CBA%yaldnif.w@blueyonder.co.uk>
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Date: Tue, 30 Jan 2007 02:43:26 +0100
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Date: 2007-01-30T02:43:22+01:00
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On Tue, 2007-01-30 at 00:51 +0000, (see below) wrote:
> On 29/1/07 21:30, in article 1170106218.6329.63.camel@localhost, "Georg
> Bauhaus" <bauhaus@arcor.de> wrote:
> > Unlike Pascal, for example, types in Ada are different when
> > they have different names.
> 
> On the contrary, this *exactly* like (ISO Standard) Pascal.

I don't think so, if a Pascal compiler is supposed
to determine "the same type" (exact same type) by looking
at the definition, not the name. Otherwise two compilers
claiming to support ISO Pascal are broken:

program p;

type 
   T = 1 .. 3;
   S = 1 .. 3;
var
   x : T;
   y : S;
begin
   x := y;   { fine in Pascal }
end.

This program seems to be Standard Pascal, and compiles.
The corresponding Ada program will not compile:

procedure p is
   type T is range 1 .. 3;
   type S is range 1 .. 3;
   x : T;
   y : S
begin
   x := y; -- not the same type, compilation error
end;