Hi,
On Thu, 2008-11-20 at 18:21 -0600, Carsten Neumann wrote:
> Hi Gerrit,
>
> >> Then finally it seems nice to be able to use
> >> a derived type for the global instance, instead of being fixed to what
> >> OpenSG comes with. So basically I'm changing SceneFileHandlerBase a bit
> >> and instead of
> >>
> >> typedef SingletonHolder<SceneFileHandlerBase> SceneFileHandler;
> >>
> >> it is:
> >>
> >> class SceneFileHandler
> >> {
> >> public:
> >> static SceneFileHandlerBase *the(void);
> >>
> >> static bool destroy (void );
> >> static void setSingleton(SceneFileHandlerBase *singleton);
> >>
> >> private:
> >> static SceneFileHandlerBaseRefPtr _the;
> >> };
> >>
> >> so that _the can be replaced.
> >
> > Hmm, why do you still need the singleton structure at all (it is no
> > singleton anymore anyway), and you plan to pass the handler pointer to
> > the individual file handlers, so get rid of it. Just let the users
> > create the global handler they want.
> >
> > Actually a compromise would be let the old singleton structure be there
> > for convenience and just pass the required pointers to the actual file
> > handlers so they don't have to go to the global one. This way the users
> > can start out with whatever global handler they like.
>
> yes, that was the idea - allow creation of your own objects and keep the
> singleton just as a convenient (backwards compatible) way of getting the
> global handler.
ok I might have been a little unclear, actually I guess not only a
little ;-). What I wanted to say was that I would switch from the
singleton to a prototype/factory pattern.
In general I would try to work out the general infrastructure things
(compression/encryption/caching) first and than, as a last step
do this transition.
kind regards,
gerrit
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