Re: [Opencxx-users] C++ design patterns

[Grzegorz J. <ja...@he...>]

Hi Markus,

On Wed, 3 Mar 2004, SF Markus Elfring wrote:

> > First, please read my post again. I am not saying that you *need* pointers
> > to express "special value".
>
> How do you think about to return an object for your "special value"
> like it is done with the methods "begin" and "end" in a list class?
> http://www.igpm.rwth-aachen.de/C++/STL_doc/List.html

Why do you think STL list<>::end() returns an object?

Do you think that in general it is better to return an object rather
then NULL pointer? If so, why?

> > Third, I am not sure I fully understand your iterators example. The source
> > of my confusion may be the fact that raw poiters are also valid STL
> > iterators. Could you elaborate on what exactly you want to point out?
>
> The STL encapsulates this behaviour with template classes.

What do you mean by "this behaviour" ? Could you restate?

> So you are used to that kind of "magic".
>
> > I am sorry, I do not understand the question. What copy semantics do I use
> > where?
>
> This topic deals with object identity and object equality.

Yes, there are connections. But what is your question?

Regards
Grzegorz

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