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From: "Matthew Heaney" <mheaney@on2.com>
Newsgroups: comp.lang.ada
Subject: Re: OO in Ada
Date: Mon, 7 Oct 2002 10:10:27 -0400
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"SteveD" <nospam_steved94@attbi.com> wrote in message
news:JVrn9.40015$FO4.9224@sccrnsc03...
>
> In C++ there is a hidden "this" pointer quietly hiding in the background
> that you must be very much aware of (if you're doing any serious
> programming).  In Ada this is an explicit variable passed into the
> procedure.

This is also true in Ada, wrt passing unconstrained arrays:

procedure Op (S : String) is

You're actually passing a descriptor on the stack, which contains info about
the string's length and index range.  So here there is "hidden" information
being passed too, not unlike an implicit this-ptr in C++.