--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/main-ptr.cc	Fri Dec 22 09:03:09 2006 +0100
@@ -0,0 +1,76 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+#include "ns3/ptr.h"
+#include <iostream>
+
+using namespace ns3;
+
+class A 
+{
+public:
+  A ();
+  ~A ();
+  void Method (void);
+};
+A::A ()
+{
+  std::cout << "A constructor" << std::endl;
+}
+A::~A()
+{
+  std::cout << "A destructor" << std::endl;
+}
+void
+A::Method (void)
+{
+  std::cout << "A method" << std::endl;
+}
+
+static Ptr<A> g_a = 0;
+
+static Ptr<A>
+StoreA (Ptr<A> a)
+{
+  Ptr<A> prev = g_a;
+  g_a = a;
+  return prev;
+}
+
+static void
+ClearA (void)
+{
+  g_a = 0;
+}
+
+
+
+int main (int argc, char *argv[])
+{
+  {
+    // Create a new object of type A, store it in global 
+    // variable g_a
+    Ptr<A> a = new A ();
+    a->Method ();
+    Ptr<A> prev = StoreA (a);
+    assert (prev == 0);
+  }
+
+  {
+    // Create a new object of type A, store it in global 
+    // variable g_a, get a hold on the previous A object.
+    Ptr<A> a = new A ();
+    Ptr<A> prev = StoreA (a);
+    // call method on object
+    prev->Method ();
+    // Clear the currently-stored object
+    ClearA ();
+    // remove the raw pointer from its smart pointer.
+    // we can do this because the refcount is exactly one
+    // here
+    A *raw = prev.Remove ();
+    raw->Method ();
+    delete raw;
+  }
+
+
+  return 0;
+}