forked from cawka/ndn.cxx
diff --git a/ndn-cpp/trie/payload-traits/pointer.h b/ndn-cpp/trie/payload-traits/pointer.h
new file mode 100644
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+++ b/ndn-cpp/trie/payload-traits/pointer.h
@@ -0,0 +1,40 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013, Regents of the University of California
+ * Alexander Afanasyev
+ *
+ * BSD license, See the LICENSE file for more information
+ *
+ * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef NDN_TRIE_PAYLOAD_TRAITS_POINTER_H
+#define NDN_TRIE_PAYLOAD_TRAITS_POINTER_H
+
+namespace ndn {
+namespace trie {
+
+template<typename Payload, typename BasePayload = Payload>
+struct pointer_payload_traits
+{
+ typedef Payload payload_type; // general type of the payload
+ typedef Payload* storage_type; // how the payload is actually stored
+ typedef Payload* insert_type; // what parameter is inserted
+
+ typedef Payload* return_type; // what is returned on access
+ typedef const Payload* const_return_type; // what is returned on const access
+
+ typedef BasePayload* base_type; // base type of the entry (when implementation details need to be hidden)
+ typedef const BasePayload* const_base_type; // const base type of the entry (when implementation details need to be hidden)
+
+ static Payload* empty_payload;
+};
+
+template<typename Payload, typename BasePayload>
+Payload*
+pointer_payload_traits<Payload, BasePayload>::empty_payload = NULL;
+
+} // trie
+} // ndn
+
+#endif // NDN_TRIE_PAYLOAD_TRAITS_POINTER_H