diff --git a/ndnboost/range/detail/safe_bool.hpp b/ndnboost/range/detail/safe_bool.hpp
new file mode 100644
index 0000000..fad34c4
--- /dev/null
+++ b/ndnboost/range/detail/safe_bool.hpp
@@ -0,0 +1,72 @@
+//  This header intentionally has no include guards.
+//
+//  Copyright (c) 2010 Neil Groves
+//  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
+//
+// This code utilises the experience gained during the evolution of
+// <ndnboost/smart_ptr/operator_bool.hpp>
+#ifndef BOOST_RANGE_SAFE_BOOL_INCLUDED_HPP
+#define BOOST_RANGE_SAFE_BOOL_INCLUDED_HPP
+
+#include <ndnboost/config.hpp>
+#include <ndnboost/range/config.hpp>
+
+namespace ndnboost
+{
+    namespace range_detail
+    {
+
+template<class DataMemberPtr>
+class safe_bool
+{
+public:
+    typedef safe_bool this_type;
+
+#if (defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, < 0x570)) || defined(__CINT_)
+    typedef bool unspecified_bool_type;
+    static unspecified_bool_type to_unspecified_bool(const bool x, DataMemberPtr)
+    {
+        return x;
+    }
+#elif defined(_MANAGED)
+    static void unspecified_bool(this_type***)
+    {
+    }
+    typedef void(*unspecified_bool_type)(this_type***);
+    static unspecified_bool_type to_unspecified_bool(const bool x, DataMemberPtr)
+    {
+        return x ? unspecified_bool : 0;
+    }
+#elif \
+    ( defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, < 0x3200) ) || \
+    ( defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 304) ) || \
+    ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590) )
+
+    typedef bool (this_type::*unspecified_bool_type)() const;
+
+    static unspecified_bool_type to_unspecified_bool(const bool x, DataMemberPtr)
+    {
+        return x ? &this_type::detail_safe_bool_member_fn : 0;
+    }
+private:
+    bool detail_safe_bool_member_fn() const { return false; }
+#else
+    typedef DataMemberPtr unspecified_bool_type;
+    static unspecified_bool_type to_unspecified_bool(const bool x, DataMemberPtr p)
+    {
+        return x ? p : 0;
+    }
+#endif
+private:
+    safe_bool();
+    safe_bool(const safe_bool&);
+    void operator=(const safe_bool&);
+    ~safe_bool();
+};
+
+    } // namespace range_detail
+} // namespace ndnboost
+
+#endif // include guard