[Boost-sandbox-cvs] boost-sandbox/boost/thread_safe_signals track.hpp, 1.9, 1.10

[Frank M. H. <fm...@us...>]

Update of /cvsroot/boost-sandbox/boost-sandbox/boost/thread_safe_signals
In directory sc8-pr-cvs3.sourceforge.net:/tmp/cvs-serv6845/thread_safe_signals

Modified Files:
	track.hpp 
Log Message:
tracked object returned by single argument track() should at least
support conversion back into a shared_ptr.



Index: track.hpp
===================================================================
RCS file: /cvsroot/boost-sandbox/boost-sandbox/boost/thread_safe_signals/track.hpp,v
retrieving revision 1.9
retrieving revision 1.10
diff -u -d -r1.9 -r1.10
--- track.hpp	22 Feb 2007 18:54:58 -0000	1.9
+++ track.hpp	22 Feb 2007 19:51:20 -0000	1.10
@@ -48,14 +48,28 @@
       T _value;
       weak_ptr<void> _tracked_ptr;
     };
-    // Convenience functions for binders.
+
     template<typename T>
-    tracked<weak_ptr<T> > track(const shared_ptr<T>& ptr) {
-      return tracked<weak_ptr<T> >(weak_ptr<T>(ptr), ptr);
+    class tracked_shared_ptr: public tracked<weak_ptr<T> >
+    {
+    public:
+      tracked_shared_ptr(const weak_ptr<T>& ptr):
+        tracked<weak_ptr<T> >(ptr, ptr.lock())
+      {}
+      operator shared_ptr<T> () const
+      {
+        return shared_ptr<T>(static_cast<const weak_ptr<T> &>(*this));
+      }
+    };
+
+   // Convenience functions for binders.
+    template<typename T>
+    tracked_shared_ptr<T> track(const shared_ptr<T>& ptr) {
+      return tracked_shared_ptr<T>(ptr);
     }
     template<typename T>
-    tracked<weak_ptr<T> > track(const weak_ptr<T>& ptr) {
-      return tracked<weak_ptr<T> >(ptr, ptr.lock());
+    tracked_shared_ptr<T> track(const weak_ptr<T>& ptr) {
+      return tracked_shared_ptr<T>(ptr);
     }
     template<typename T>
     tracked<T> track(const T &value, const shared_ptr<void> &tracked_ptr) {