Fix PagedLOD for random objects.

[simgear.git] / simgear / structure / SGReferenced.hxx

diff --git a/simgear/structure/SGReferenced.hxx b/simgear/structure/SGReferenced.hxx
index 13f929954b48df485cb0c21e581f810702d26f3a..67e4fb1ed18ba36b7d42d206dfd9155047d0a0ee 100644 (file)
--- a/simgear/structure/SGReferenced.hxx
+++ b/simgear/structure/SGReferenced.hxx
@@ -21,10 +21,14 @@
 #ifndef SGReferenced_HXX
 #define SGReferenced_HXX
 
+#include "SGAtomic.hxx"
+
 /// Base class for all reference counted SimGear objects
 /// Classes derived from this one are meant to be managed with
 /// the SGSharedPtr class.
-/// For more info see @SGSharedPtr.
+///
+/// For more info see SGSharedPtr. For using weak references see
+/// SGWeakReferenced.
 
 class SGReferenced {
 public:
@@ -38,16 +42,16 @@ public:
   { return *this; }
 
   static unsigned get(const SGReferenced* ref)
-  { if (ref) return ++(ref->_refcount); else return ~0u; }
+  { if (ref) return ++(ref->_refcount); else return 0; }
   static unsigned put(const SGReferenced* ref)
-  { if (ref) return --(ref->_refcount); else return ~0u; }
+  { if (ref) return --(ref->_refcount); else return 0; }
   static unsigned count(const SGReferenced* ref)
-  { if (ref) return ref->_refcount; else return ~0u; }
+  { if (ref) return ref->_refcount; else return 0; }
   static bool shared(const SGReferenced* ref)
   { if (ref) return 1u < ref->_refcount; else return false; }
 
 private:
-  mutable unsigned _refcount;
+  mutable SGAtomic _refcount;
 };
 
 #endif