diff --git a/model/sync-full-leaf.cc b/model/sync-full-leaf.cc
new file mode 100644
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--- /dev/null
+++ b/model/sync-full-leaf.cc
@@ -0,0 +1,51 @@
+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2012 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ *         卞超轶 Chaoyi Bian <bcy@pku.edu.cn>
+ *	   Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#include "sync-full-leaf.h"
+#include <boost/ref.hpp>
+
+using namespace boost;
+
+namespace Sync {
+
+FullLeaf::FullLeaf (NameInfoConstPtr info, const SeqNo &seq)
+  : Leaf (info, seq)
+{
+  updateDigest ();
+}
+
+void
+FullLeaf::updateDigest ()
+{
+  m_digest.reset ();
+  m_digest << getInfo ().getDigest () << getSeq ().getDigest ();
+}
+
+// from Leaf
+void
+FullLeaf::setSeq (const SeqNo &seq)
+{
+  Leaf::setSeq (seq);
+  updateDigest ();
+}
+
+} // Sync