[Worldforge-all-lists] [WF-Cpptraining] Namespaces [Was Re: c++training]

[CC <pc...@ne...>]

Hi,  I've been lurking here for a bit and was just
reading the digests about the training.  It has
been a long time since I've written to a mailinglist,
so I hope this is the right way of doing so.  

A little bit about myself.  

I actually know very little C++.  Only the
basic OOP concepts, and nothing really detailed.
I've heard about namespaces, templates and the
rest of the complicated stuff, but I truly don't
understand what they all do aside for being
special C++ constructs.  

So I decided to give this mailing list a try.
The first digest, I understood most of the
theory (it was about classes and inheritance,
IIRC).  After that, things started to lose me.

Recently, I corresponded my concern regarding
namespaces and here's what I wrote.  I realized
it should've been posted on the mailing list,
but due to my slight apprehension in the matter
that it was a little stupid, I asked Jonathan
first.  

Jonathan W wrote:
> 
> Where you able to understand the namespaces
> email?
> 

Actually, a bit.  Namely (heh) the point about
grouping like classes together.  But what I don't
understand is what use it might do.  

Just like your namespace creatures..

if I have a human class and a monster class, and I
stick them in a namespace called Creatures; what is
the difference if I just placed them as different libraries.

ie. Librarya.H  contains human class
    Libraryb.H  contains monster class.

I include them(either or both), and then I can then
instantiate a sub-class from the human class?

Right now.. as I can see and understand, I still define
the human and monster class in a different(?) header,
and then within the same header file, I define a 
namespace called Creatures and then from a cpp file,
I can then use the namespace creatures just so I
can use the classes human and monster?

Isn't that adding more stuff to the memory?  I do 
apologize if that's a stupid question, but I'm
having second thoughts in my understanding of
classes; particularly after seeing the 'virtual'
reserved word added here and there.   I have
read about the 'virtual' keyword, but I don't
understand what it does.  I realize it's not
on topic (namespaces) when discussing about
virtual keywords, but it does pop in.

I'm glad it's just namespaces you've mentioned.
It seems a lot easier to understand than
templates, which completely confuses me.. ok,
I admit, I haven't really bothered reading about
templates as one look at them scare me.  BUt
not as much as Pointers.. 8)


CC
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email: pc...@ne... | "boku wa ima mo, hashiri tsuzukeru."

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