Re: Weird behaviour of DEV_DOT::clone()

#excuse typos.
*putput - -> output

Rishabh Yadav
Junior Undergraduate
Department of Electronics Engineering
IIT (BHU), Varanasi
Varanasi-221005
India


On Fri, Aug 1, 2014 at 12:14 PM, Rishabh Yadav <
[email protected]> wrote:

> I tried running the following piece of code and expected the putput to be
> ''''
> hello
> hello
> ''''
> instead the output I'm getting is
> ''''
> hello
>
> ''''
>
> CARD_LIST cl;
> std::string s1 = "hello";
> DEV_DOT somedot1;
> somedot1.set(s1);
> CARD* d = somedot1.clone();
> cl.push_back(d);
> std::cout << somedot1.s() << "\n";
> for(CARD_LIST::iterator i=cl.begin(); i!=cl.end(); ++i)
> {
>   DEV_DOT* d = dynamic_cast<DEV_DOT*>(*i);
>   //assert(d);
>   std::cout << d->s() << "\n";
> }
>
> So,the issue is object I get after dynamically typecasting the iterator
> variable into DEV_DOT(inside the for loop) doesn't contain the string
> information in it meaning the string field in the retrieved DEV_DOT object
> is blank.
> maybe this was happening because copy constructor of DEV_DOT wasn't
> copying the "_s" variable
> Felix suggested me to apply a patch to d_dot.h
>
> -explicit DEV_DOT(const DEV_DOT& p) :CARD(p) {set_constant(true);}
> +explicit DEV_DOT(const DEV_DOT& p) :CARD(p), _s(p._s)
> {set_constant(true);}
>
> But even applying the patch didn't help
> .
> One interesting thing I noted is If I use some print statement in the copy
> constructor of DEV_DOT defined in d_dot.h then its not printing
> anything.Then I commented out the following line
>
> explicit DEV_DOT(const DEV_DOT& p) :CARD(p), _s(p._s) {
> std::cout << "cloning...\n";
> set_constant(true);}
>
> from d_dot.h and even after calling somedot.clone() in the above piece of
> code, the program compiled successfully. I concluded that somedot.clone()
> isn't calling the DEV_DOT copy constructor it's calling the clone from some
> other library.Am I correct?
> I need your help regarding this matter.Thanks in advance.
> Regards,
> Rishabh Yadav
> Senior Undergraduate
> Department of Electronics Engineering
> IIT (BHU), Varanasi
> Varanasi-221005
> India
>