diff --git a/ndn-cpp/Closure.hpp b/ndn-cpp/Closure.hpp
new file mode 100644
index 0000000..99dafdb
--- /dev/null
+++ b/ndn-cpp/Closure.hpp
@@ -0,0 +1,68 @@
+/**
+ * @author: Jeff Thompson
+ * This is a port of py from PyCCN, written by: 
+ * Derek Kulinski <takeda@takeda.tk>
+ * Jeff Burke <jburke@ucla.edu>
+ * 
+ * See COPYING for copyright and distribution information.
+ */
+
+#ifndef NDN_CLOSURE_HPP
+#define	NDN_CLOSURE_HPP
+
+#include "Common.hpp"
+
+namespace ndn {
+
+enum UpcallResult {
+  CLOSURE_RESULT_ERR               = -1, // upcall detected an error
+  CLOSURE_RESULT_OK                =  0, // normal upcall return
+  CLOSURE_RESULT_REEXPRESS         =  1, // reexpress the same interest again
+  CLOSURE_RESULT_INTEREST_CONSUMED =  2, // upcall claims to consume interest
+  CLOSURE_RESULT_VERIFY            =  3, // force an unverified result to be verified
+  CLOSURE_RESULT_FETCHKEY          =  4  // get the key in the key locator and re-call the interest
+};
+
+enum UpcallKind {
+  UPCALL_FINAL              = 0, // handler is about to be deregistered
+  UPCALL_INTEREST           = 1, // incoming interest
+  UPCALL_CONSUMED_INTEREST  = 2, // incoming interest, someone has answered
+  UPCALL_CONTENT            = 3, // incoming verified content
+  UPCALL_INTEREST_TIMED_OUT = 4, // interest timed out
+  UPCALL_CONTENT_UNVERIFIED = 5, // content that has not been verified
+  UPCALL_CONTENT_BAD        = 6  // verification failed  
+};
+
+class NDN;
+class Interest;
+class ContentObject;
+
+class UpcallInfo {
+public:
+  UpcallInfo(NDN *ndn, ptr_lib::shared_ptr<Interest> interest, int matchedComps, ptr_lib::shared_ptr<ContentObject> contentObject) 
+  {
+    ndn_ = ndn;
+    interest_ = interest;
+    contentObject_ = contentObject;
+  }
+  
+  NDN *getNDN() { return ndn_; }
+  
+  ptr_lib::shared_ptr<Interest> getInterest() { return interest_; }
+  
+  ptr_lib::shared_ptr<ContentObject> getContentObject() { return contentObject_; }
+  
+private:
+  NDN *ndn_;
+  ptr_lib::shared_ptr<Interest> interest_;
+  ptr_lib::shared_ptr<ContentObject> contentObject_;
+};
+
+class Closure {
+public:
+  virtual UpcallResult upcall(UpcallKind kind, UpcallInfo &upcallInfo) = 0;
+};
+
+}
+
+#endif