On Thu, Mar 12, 2009 at 3:55 PM, Dirk Reiners <[email protected]> wrote:
> Allen Bierbaum wrote:
>> How do you keep a weak pointer across threads? Is there an MTWeakPtr
>> or equivalent (haven't seen it so far).
>
> Hasn't come up yet as a need.
The place I need it is for a global geometry factory.
I have a system that basically looks something like this:
class Factory:
std:map<style, OSG::ChunkMaterialXXX> style cache;
OSG::NodeMTRecPtr buildGeomNode(myGeom* geom, Style style);
I want to cache the style materials across multiple built geometries.
But once the last geometry using that cached style is removed, I don't
want to hold onto the material any more. Until this morning I didn't
think I would be able to do this, but now I think I could do it with
an MTWeakPtr. (I need MT because this can be called from multiple
threads)
> Should be pretty easy to do though, just add a
>
>
> struct MTWeakRefCountPolicy : public WeakRefCountPolicy
> {
> template <class T>
> static T *validate (T *pObject)
> {
> return convertToCurrentAspect(pObject);
> }
>
> template <class T>
> static T &dereference(T *pObject)
> {
> return *(validate(pObject));
> }
> };
>
> and use it. Or am I too optimistic here?
So, where exactly would I add this in the OpenSG code? Also, where
should I put the ptr type aliases?
-Allen
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