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

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;