Re: [Gaul-devel] entity->data: vpointer or SLList ?

[Johannes Z. <joh...@ze...>]

Hi Stewart,

well, I DO use in fact ga_entity_clone() in an adaption function.

Why don't entity_t take a simple (void*)? I didn't dive to much into
the code, but it seems that ga_entity_clone() doesn't really clone
the phenotype (user data) but it links it and does some reference
counting. If this is so, I think it's wrong because a clone doesn't
share the same phenotype (but has a similar phenotype) to my
understanding.

Why not simplifying things by using a simple (void*) as user data
and a user supplied hook function which makes deep copies of the
user data?

Just a thought and really w/o diving too much into the code ...

-- 
Johannes

On Sat, May 07, 2005 at 05:51:00PM +0100, Stewart Adcock wrote:
> Hi Johannes,
> 
> This hasn't been documented because it might change.  I'll send you an
> annotated example to demonstrate how it should be used currently, but
> I'm away from home at the moment.  If I don't send it on Monday,
> please remind me.
> 
> Basically, entity->data should be a SLList (a single-linked list) with
> one element for each chromosome.  There are hooks in the code for
> handling reference counting, but these needn't be used.  IIRC, if your
> entities only have one chromosome, and you don't use ga_entity_clone()
> then you can use a pointer to whatever you like.
> 
> Stewart.
> 
> On 5/7/05, Johannes Zellner <joh...@ze...> wrote:
> > Hi,
> > 
> > I wonder which type entity->data is:
> > 
> > ga_core.h tells me
> > 
> > struct entity_t {
> >    double fitness;
> >    vpointer* chromosome;
> >    vpointer data;
> > };
> > 
> > but ga_copy_data (which is called by ga_entity_clone for example)
> > uses data as SLList (e.g. by calling slink_append with the entity->data
> > field.
> > 
> > In other words: how can I store user data in entity->data?
> > 
> > --
> > Johannes
> > 
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> 
> 
> -- 
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