Hi Folks,
I have done some kind of analysis.
whenever we have any static member variable which contains itself as member ,
when we do memory allocation using new , that memory will be shared for all
internal variables which are of same type. but I am really wondering why so.
example:
class mytest{
public:
int x;
static mytest *str;
void fillMem()
{
str = new mytest(); // Here the same memory is shared by all
variables. I mean this str contains another str internally. again that internal
str contains another str etc. when we do new for this str , all internal str's
share the same memory. But I am really wondering why. Please explain.
}
};
mytest *mytest::str=NULL;
GopiKrishna Komanduri
Software engineer
[email protected]
--- On Tue, 29/9/09, Gopi Krishna Komanduri <[email protected]> wrote:
From: Gopi Krishna Komanduri <[email protected]>
Subject: [c-prog] a small query related to singleton Class
To: [email protected]
Date: Tuesday, 29 September, 2009, 11:25 PM
Hi Folks,
I have a small query related to singleton class. Upto my knowledge , if we
try to delete the static object of singleton class , stack overflow happens.
But if we do the same from main() , stack overflow wont happen. I will keep an
example to make it simple.
#include "sngle.h"
MySngleTon* MySngleTon:: MyCreateInstance ()
{
if(!obj)
{
obj = new MySngleTon() ;
}
return obj;
};
MySngleTon:: MySngleTon( )
{
};
MySngleTon:: MySngleTon( const MySngleTon &obj)
{
};
MySngleTon:: ~MySngleTon( )
{
//cout<<"I am in desc"<<endl;
delete obj; // stack overflow occurs
}
/*void MySngleTon:: operator delete(void *p)
{
delete p;
}
int MySngleTon:: DestroyInstance( )
{
if(refCount >1 )
refCount--;
else
{
}
}*/
int main()
{
MySngleTon *x=MySngleTon: :MyCreateInstanc e();
MySngleTon *y=MySngleTon: :MyCreateInstanc e();
delete x; (here even x internally contain one more static object and
recrussion occurs . so I expect stack overflow even at here. But its not
happening as expected.
}
GopiKrishna Komanduri
Software engineer
Hyderabadgopikomand u...@yahoo. com
Now, send attachments up to 25MB with Yahoo! India Mail. Learn how.
http://in.overview. mail.yahoo. com/photos
[Non-text portions of this message have been removed]
Connect more, do more and share more with Yahoo! India Mail. Learn more.
http://in.overview.mail.yahoo.com/
[Non-text portions of this message have been removed]
