Virtual Constructor is possible in c++?

[Manika vasakam]

if it is possible to achive virtual constructor, how?
plz.explain it with a code.

Regards
Manikam

[Sriramkumar]

I dont think, there is something called virtual constructor in c++.
But you can simulate one if u need.

Juz chk this link
http://www.parashift.com/c++-faq-lite/virtual-functions.html
read ques 20.8

But i dont understand y u want to use virtual constructors. Can u give
me a scenario wherein u require virtual constructors.

[Rahul Agarwal]

I wanna to know how the virtual keyword works

when we are saying that some class is inherited virtually

regards

Rahul Agarwal

[Venkatesh Raja]

Check

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclang/html/_pluslang_virtual_base_classes.asp

You will get a detailed explanation.

Regards,
Venkat.

--

Regards,

Venkatesan P.R,
India.

------------------------------------------------------

[Rahul Agarwal]

thanks

Venkatesan P.R,
India.

thats was the why we sud use virtual

i wanna to know how virtual will work

like

virtual uses a vtable and vptr mecanism

and it makes sense why some private virtual function will become accessible if same name is described virtual in base calss.

now when i am trying to simulate the macanism of virtual class

i m unable to simulate in such manner

.
 

--
Rahul Agarwal
(Software Developer)
Roy e solution
Delhi

[Venkatesh Raja]

You should probable refer

http://www.codesourcery.com/cxx-abi/cxx-vtable-ex.html

[Rahul Agarwal]

> > Dear All.
> >
> > As far as i know that Then memeory is divided into the three segements
> >
> > 1. Heap;
> > 2. Stack;
> > 3. Data segmnet;
>
> That may be true in some implementations, but none of these are C
> terms.  In some implementations, malloc() and friends allocate memory
> from the "heap", local variables are on the "stack", and static and
> global variables are in the "data segment" -- but others may do things
> differently.
>
hi as u r writing that static and global will be in data segment , data segment is the part which is copied if an application is all ready in memory .
eg. if internate exploreer is allready open and we have clicked it once more a new code copy will not be there only the data segment part will be cpoied in memory and same codesegment will be used .
is it correct? it is .

now
i have program a application in which i have use a global static variable.
if the data segment is holding the static and global variables so that segment should be copied to other segment (as a new instance of that process play) but what is happening that global static variable is incrementing for the all three instance of that process are running.