Hi Robert,
The this I don't understand, is that I copy the code for my own registry,
with exactly the same static implementation, but I get a new instance each
time I call the instance(). The constructor is called and the adress
changes...
This is a part of the code :
Registry* Registry::instance(bool erase)
> {
> static Registry* s_registry = new Registry;
>
> if(erase)
> {
> s_registry->destruct();
> s_registry = NULL;
> }
>
> return s_registry;
> }
>
>
> class DLL_EXPORT Registry
> {
>
> public :
>
> static Registry* instance(bool erase = false);
> }
>
I know static variable is the same for each instance, but how can it be true
if the constructor is called each time ?
So i can't see the problem, considering this is the copy/paste of the osg
Registry code...
Thanks.
Regards,
Vincent.
2009/5/19 Robert Osfield <robert.osfi...@gmail.com>
> HI Vincent,
>
> Go have a look at the source code, it contains the single static
> instance of the Registry, so the method only ever returns a single
> Registry. It would be worth your reading up about static variables
> in C/C++ so you can understand how this stuff works, it really beyond
> the scope of the OSG community to teach your this stuff.
>
> Robert.
>
> On Tue, May 19, 2009 at 11:54 AM, Vincent Bourdier
> <vincent.bourd...@gmail.com> wrote:
> > Hi all,
> >
> > A little new question about a c++ implementation of registry :
> >
> > The static method instance() return a new registry each time, so each
> call
> > have a new instance, so how can the registry's class plugin list can be
> good
> > ? any call to registry::instance()->addReaderWriter() add the the
> > reader/Wirter in a new registry instance ... so how can it works
> correctly ?
> >
> > Thanks for you help.
> >
> > Regards,
> > Vincent.
> >
> > 2009/5/15 Vincent Bourdier <vincent.bourd...@gmail.com>
> >>
> >> Hi Art,
> >>
> >> I need to make these lib (dll/so) for linux and window at least, so I
> need
> >> common behavior.
> >> I'm thinking a mix of the inheriting class and the osg plugin registry
> >> behavior with the template static register method ... (note so
> >> understandable I think) that is to say, may be a mix of all these way
> can
> >> bring me to a good solution ..
> >>
> >> Still here if you have suggestion or ideas
> >>
> >> Thanks every one, still good to have quality help here :-)
> >>
> >> Regards,
> >> Vincent.
> >>
> >> 2009/5/15 Art Tevs <arti_t...@yahoo.de>
> >>>
> >>> Hi Vincent,
> >>>
> >>>
> >>>
> >>> Vincent.B wrote:
> >>> > Hi all,
> >>> > If you need to load dynamically some DLL (as osg plugins) but theses
> >>> > DLL have no similar I/O (so make each one inherit from a base class
> have no
> >>> > sense), how will you do ?
> >>> >
> >>> > I'm thinking in the calssical loadLibrary and getProcAdress for each
> >>> > one, ... but if you know or think in an other solution, I would be
> very
> >>> > interested to hear it.
> >>> >
> >>>
> >>>
> >>> In windows world each dll can have an entry point. This is a C
> function,
> >>> which will be called on dll loading. In unix world, I am not sure if
> there
> >>> exists default entry point routines, I think yes, but I am not sure.
> >>>
> >>> cheers,
> >>> art
> >>>
> >>> ------------------
> >>> Read this topic online here:
> >>> http://forum.openscenegraph.org/viewtopic.php?p=12249#12249
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> _______________________________________________
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> >>>
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> >>
> >
> >
> > _______________________________________________
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> >
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> >
> >
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