Added first shot at a development shell

src/smart-pointer.h

Index: src/smart-pointer.h
diff --git a/src/smart-pointer.h b/src/smart-pointer.h
index 03fd229b43c50262f72d8656f50fbcc0b7312bd3..c39df16869582f9426cec5a4162046d57675b180 100644
--- a/src/smart-pointer.h
+++ b/src/smart-pointer.h
@@ -86,7 +86,7 @@ class SmartPointer {
   // the copy constructor it removes the pointer in the original to avoid
   // double freeing.
   inline SmartPointer& operator=(const SmartPointer<T>& rhs) {
-    ASSERT(p == NULL);
+    ASSERT(is_empty());
     T* tmp = rhs.p;  // swap to handle self-assignment
     const_cast<SmartPointer<T>&>(rhs).p = NULL;
     p = tmp;
@@ -94,6 +94,11 @@ class SmartPointer {
   }
 
 
+  inline bool is_empty() {
+    return p == NULL;
+  }
+
+
  private:
   T* p;
 };