Old, but still relevant, write-up on ref_ptr: http://andesengineering.com/OSG_ProducerArticles/RefPointers/RefPointers.html
<http://andesengineering.com/OSG_ProducerArticles/RefPointers/RefPointers.html> Glenn Waldron / Pelican Mapping / 703.652.4791 / @glennwaldron 2011/3/16 Sergey Polischuk <[email protected]> > Hi, Yasser > > osg ref_ptr's are intrusive, and object's reference count get's incremented > every time you create ref_ptr to this object, and it decrease every time > this ref_ptr destroyed. Inside osg all objects that keep pointers on other > objects use ref_ptr's for that purpose, so if you pass simple pointer to > some osg object it'll be refcounted correctly. You can not use delete on > objects pointer that can be wrapped in ref_ptr because they have protected > destructor and free when there are no more references to them. If you get > pointer and need to be sure that it will be valid over time, you should > create ref_ptr out of this pointer (thus increasing ref count) and keep it > instead. In general if you create osg objects that can be wrapped into > ref_ptr's you should make ref_ptr out of object's pointer at some point > (though this can happen inside osg code if you pass pointer to some osg > object which keeps it with ref_ptr) or they will not be destructed. > > Cheers, > Sergey. > > 16.03.2011, 23:59, "Yasser Asmi" <[email protected]>: > > I am new to OSG and while I understand the general reference counting > rules, I am having some trouble finding all the ref_ptr rules we should be > following. For instance most examples in OSG do not use ref_ptr on objects > and also do not free them. Sometime, these objects (Geometry, Vec3Array > etc) are passed to methods. It is not clear if the methods are refcounting > etc. Stepping through the source is a way to find out but I am looking for > general guidance. Is there a resource that talks about it? > > > > Thank you! > > > > Cheers, > > Yasser > > > > ------------------ > > Read this topic online here: > > http://forum.openscenegraph.org/viewtopic.php?p=37666#37666 > > > > _______________________________________________ > > osg-users mailing list > > [email protected] > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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