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From: cjkywt@hotmail.com (Sergey)
Newsgroups: comp.lang.ada
Subject: Re: Unchecked deallocation question
Date: 26 Nov 2004 02:53:30 -0800
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Date: 2004-11-26T02:53:30-08:00
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Jim Rogers <jimmaureenrogers@att.net> wrote in message news:<OXxpd.59698$7i4.57298@bgtnsc05-news.ops.worldnet.att.net>...
> Adrien Plisson <aplisson-news@stochastique.net> wrote in
> news:41a66926$0$25070$ba620e4c@news.skynet.be: 
> 
> > Martin Krischik wrote:
> >> You should carefully thing if you really need it. Unlike C/C++ the
> >> following is actually valid:
> >> 
> >> declare
> >>     It : Root'Class := Derived'(...);
> >> begin
> >>     ...
> >> end;
> > 
> > mmmm, i don't think there is any problem doing this in C++:
> > 
> > class Root;
> > class Derived : public Root;
> > 
> > Root &It = Derived( ... );
> > 
> > it just uses a reference type which is almost the same as ada access 
> > type but you cannot assign null to it and cannot dereference it.
> > 
> 
> This is a difference between C++ and Ada. The C++ solution uses
> dynamic memory allocation (from the free space or heap) while the
> Ada solution uses the stack. 

An example was posted by Adrien has nothing to do with dynamic memory
allocation. As you can see, Derived is allocated from the STACK.

>Use of the stack eliminates the need
> for explicit allocation and deallocation.
> 
> Jim Rogers