Added Camera's s/getCameraThread() and updated wrappers

include/osg/Camera

@@ -318,6 +318,20 @@ class OSG_EXPORT Camera : public Transform, public CullSettings
         const BufferAttachmentMap& getBufferAttachmentMap() const { return _bufferAttachmentMap; }
         
         
+        /** Create a operation thread for this camera.*/
+        void createCameraThread();
+
+        /** Assign a operation thread to the camera.*/
+        void setCameraThread(OperationsThread* gt);
+
+        /** Get the operation thread assigned to this camera.*/
+        OperationsThread* getCameraThread() { return _cameraThread.get(); }
+
+        /** Get the const operation thread assigned to this camera.*/
+        const OperationsThread* getCameraThread() const { return _cameraThread.get(); }
+
+
+
         /** Set the GraphicsContext that provides the mechansim for managing the OpenGL graphics context associated with this camera.*/
         void setGraphicsContext(GraphicsContext* context);
 
@@ -407,7 +421,10 @@ class OSG_EXPORT Camera : public Transform, public CullSettings
         RenderTargetImplementation  _renderTargetFallback;
         BufferAttachmentMap         _bufferAttachmentMap;
 
+        ref_ptr<OperationsThread>           _cameraThread;
+        
         ref_ptr<GraphicsContext>            _graphicsContext;
+        
         buffered_object< ref_ptr<Object> >  _renderingCache;
         
         ref_ptr<DrawCallback>               _postDrawCallback;

include/osg/DeleteHandler

@@ -71,6 +71,9 @@ class OSG_EXPORT DeleteHandler
 
     protected:
 
+        DeleteHandler(const DeleteHandler&) {}
+        DeleteHandler operator = (const DeleteHandler&) { return *this; }
+
         int                 _numFramesToRetainObjects;
         int                 _currentFrameNumber;
         OpenThreads::Mutex  _mutex;