C / C++ / MFC

18-Sep-08 0:04

~~I think they should. Anyway I have to admit my ignorance: I don't know what's happening (is it a debugger issue?)~~
Smile | :)

I changed my mind about. See http://www.codeproject.com/script/Forums/View.aspx?fid=1647&msg=2729211[^]

Sorry for the chaos.

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

modified on Thursday, September 18, 2008 6:40 AM

George_George18-Sep-08 0:07

18-Sep-08 0:07

Sure, let me know when you have any ideas why foo and goo are not in vtable of class Zoo. Smile | :)

regards,
George

CPallini18-Sep-08 0:29

18-Sep-08 0:29

Sorry for changing my mind several times this morning.
Anyway, now, I think I was right the very first time: the Zoo class actually does NOT override foo & goo, hence such methods should not be inits VTABLE.
Smile | :)

George_George18-Sep-08 1:16

18-Sep-08 1:16

Hi CPallini,

I have tried even if we override foo and goo in class Zoo, in vtable of class Zoo, there is still no entries for foo/goo.

regards,
George

Cedric Moonen17-Sep-08 23:09

17-Sep-08 23:09

CPallini wrote:
Why should foo & goo be in the VTABLE (I mean, no class overrides them)?

Yes, the Zoo class overrides them.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

George_George17-Sep-08 23:21

17-Sep-08 23:21

Thanks Cedric,

Sorry my English is not good. You mean foo and goo should be in vtable?

regards,
George

Cedric Moonen17-Sep-08 23:22

17-Sep-08 23:22

No, I was only replying to CPallini, not to you.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

George_George17-Sep-08 23:27

17-Sep-08 23:27

Thanks Cedric!

My careless. I want to confirm with you in the code link I posed below, you think foo and goo should be in vtable, correct?

http://www.codeproject.com/script/Forums/View.aspx?fid=1647&msg=2728926

regards,
George

Cedric Moonen17-Sep-08 23:43

17-Sep-08 23:43

I played a bit with your code and I think the problem is due to the "diamond pattern". I don't have a clear explanation of what is happening but if IFoo and IGoo inherits virtually from IBase, then the functions appear in the virtual table (in fact, looking with the debugger shows that a vtable has been added for IFoo and for IGoo).

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

George_George18-Sep-08 0:11

Re: vtable issue [modified]

18-Sep-08 0:11

Hi Cedric,

Virtual inheritance only makes one single copy of data member, and it has noting to do with methods, correct? But in my sample there is no data member. If I am wrong, please feel free to correct me.

regards,
George

CPallini17-Sep-08 23:26

17-Sep-08 23:26

~~Sure, I'me pretty blind this morning. Thank you for pointing out.~~
Smile | :)

I changed my mind again Blush | :O

(too many drugz this morning), see http://www.codeproject.com/script/Forums/View.aspx?fid=1647&msg=2729211[^]

modified on Thursday, September 18, 2008 6:32 AM

George_George17-Sep-08 23:29

17-Sep-08 23:29

Thanks CPallini,

Anyway, do you think foo and goo should be in vtable of Zoo? Smile | :)

regards,
George

CPallini18-Sep-08 0:32

18-Sep-08 0:32

Sorry, I naively acknowledged your observation, but it's (IMHO) wrong: actually Zoo class does NOT override foo & goo.
Smile | :)

Cedric Moonen18-Sep-08 0:57

18-Sep-08 0:57

Actually, we are discussing this situation[^], in which Zoo overrides foo and goo Big Grin | :-D

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

George_George18-Sep-08 1:17

18-Sep-08 1:17

You are correct, Cedric!

Do you have any ideas why foo and goo are not in class Zoo's vtable?

regards,
George

Cedric Moonen18-Sep-08 1:22

18-Sep-08 1:22

Please, don't reply each time when I make a reply to CPallini. This makes this thread completely unreadable. Furthermore, it would be nice to vote for the answers that were really helpfull, not all the answers (it helps other people to find directly the correct answer). I don't think the reply I made to CPallini was really helpfull to you... Unsure | :~

George_George wrote:
Do you have any ideas why foo and goo are not in class Zoo's vtable?

If I didn't reply to you, it probably means that I don't have the answer to your question, so, it won't help ask the question once again.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

George_George18-Sep-08 1:40

18-Sep-08 1:40

I agree with your points, Cedric! I will just wait for your reply. Smile | :)

regards,
George

CPallini18-Sep-08 1:44

18-Sep-08 1:44

I should give up with drugz Roll eyes | :rolleyes:

George_George18-Sep-08 1:16