Added default setting of use of thread safe ref/unref.

include/osg/DisplaySettings

@@ -36,13 +36,15 @@ class OSG_EXPORT DisplaySettings : public osg::Referenced
         static DisplaySettings* instance();
 
 
-        DisplaySettings()
+        DisplaySettings():
+            Referenced(true)
         {
             setDefaults();
             readEnvironmentalVariables();
         }
         
-        DisplaySettings(ArgumentParser& arguments)
+        DisplaySettings(ArgumentParser& arguments):
+            Referenced(true)
         {
             setDefaults();
             readEnvironmentalVariables();

include/osg/NodeVisitor

@@ -261,7 +261,11 @@ class OSG_EXPORT NodeVisitor : public virtual Referenced
         /** Callback for managing database paging, such as generated by PagedLOD nodes.*/
         class DatabaseRequestHandler : public osg::Referenced
         {
-        public:            
+        public:
+        
+            DatabaseRequestHandler():
+                Referenced(true) {}
+        
             virtual void requestNodeFile(const std::string& fileName,osg::Group* group, float priority, const FrameStamp* framestamp) = 0;
             
         protected:

src/osg/DisplaySettings.cpp

@@ -27,7 +27,7 @@ DisplaySettings* DisplaySettings::instance()
     return s_displaySettings.get();
 }
 
-DisplaySettings::DisplaySettings(const DisplaySettings& vs):Referenced()
+DisplaySettings::DisplaySettings(const DisplaySettings& vs):Referenced(true)
 {
     setDisplaySettings(vs);
 }

src/osg/FrameStamp.cpp

@@ -14,7 +14,7 @@
 
 using namespace osg;
 
-FrameStamp::FrameStamp():Referenced()
+FrameStamp::FrameStamp():Referenced(true)
 {
     _frameNumber=0;
     _referenceTime=0;
@@ -32,7 +32,7 @@ FrameStamp::FrameStamp():Referenced()
 
 }
 
-FrameStamp::FrameStamp(const FrameStamp& fs):Referenced()
+FrameStamp::FrameStamp(const FrameStamp& fs):Referenced(true)
 {
     _frameNumber = fs._frameNumber;
     _referenceTime = fs._referenceTime;

src/osg/NodeVisitor.cpp

@@ -17,7 +17,7 @@
 using namespace osg;
 
 NodeVisitor::NodeVisitor(TraversalMode tm):
-        Referenced()
+        Referenced(true)
 {
     _visitorType = NODE_VISITOR;
     _traversalNumber = -1;
@@ -28,7 +28,7 @@ NodeVisitor::NodeVisitor(TraversalMode tm):
 }
 
 NodeVisitor::NodeVisitor(VisitorType type,TraversalMode tm):
-    Referenced()
+    Referenced(true)
 {
     _visitorType = type;
     _traversalNumber = -1;