[gecode-users] Best practice to use a shared_ptr in a gecode solver

[Gustavo Gutierrez]

I'm sorry! I completely forgot to call the notice method in the
constructor!!.

Thanks much!

Regards,
Gustavo

On Mon, Nov 3, 2014 at 10:09 PM, Guido Tack <tack at gecode.org> wrote:

> Hi Gustavo,
>
> did you register the brancher for disposal?  It's described in sect. 19.4
> in MPG, have a look at the way home.notice() is called for the brancher in
> the example.
>
> Cheers,
> Guido
>
> > On 4 Nov 2014, at 1:58 pm, Gustavo Gutierrez <
> gustavo.ggutierrez at gmail.com> wrote:
> >
> > Dear Gecode users,
> >
> > This is probably a naive question and very related to C++. However, it
> is quite related to gecode as well. In my use case I have a shared pointer
> to an object that contains all the information of a problem instance. As
> usual, the constructor is where the CSP is defined and that object is
> passed as an argument to it.
> >
> > In addition, I implemented a brancher that also require some of the
> information pointed by the shared pointer.  Note that this infromation is
> not actually needed to construct the brancher but when computing a choice.
> I have tried several ways to make both the brancher and the shared_pointer
> happy with their respective requirements. However I have found myself in
> the following situation.
> >
> > When I add the shared_pointer as an attribute to the brancher I get the
> shared pointer reference counter messed up. The reason is that the brancher
> does not actually have a destructor and hence the shared_pointer counter is
> never decremented and the owned pointer is never destructed at the end of
> the solver execution. I tried to explicitly call the destructor of the
> shared pointer in the dispose method of the brancher. However, it seems
> that the brancher gets copied more times than the dispose method is called.
> >
> > Is there a way to integrate both approaches smoothly?. Probably I am
> overlooking something.
> >
> > Regards,
> > Gustavo
> >
> >
> > _______________________________________________
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>
>


-- 
Gustavo Gutierrez
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