Added ndnboost::weak_ptr
diff --git a/ndnboost/weak_ptr.hpp b/ndnboost/weak_ptr.hpp
new file mode 100644
index 0000000..d7bbb7d
--- /dev/null
+++ b/ndnboost/weak_ptr.hpp
@@ -0,0 +1,18 @@
+#ifndef BOOST_WEAK_PTR_HPP_INCLUDED
+#define BOOST_WEAK_PTR_HPP_INCLUDED
+
+//
+// weak_ptr.hpp
+//
+// Copyright (c) 2001, 2002, 2003 Peter Dimov
+//
+// Distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt
+//
+// See http://www.boost.org/libs/smart_ptr/weak_ptr.htm for documentation.
+//
+
+#include <ndnboost/smart_ptr/weak_ptr.hpp>
+
+#endif // #ifndef BOOST_WEAK_PTR_HPP_INCLUDED