diff --git a/ndnboost/function_types/detail/classifier.hpp b/ndnboost/function_types/detail/classifier.hpp
new file mode 100644
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--- /dev/null
+++ b/ndnboost/function_types/detail/classifier.hpp
@@ -0,0 +1,82 @@
+
+// (C) Copyright Tobias Schwinger
+//
+// Use modification and distribution are subject to the boost Software License,
+// Version 1.0. (See http://www.boost.org/LICENSE_1_0.txt).
+
+//------------------------------------------------------------------------------
+
+#ifndef BOOST_FT_DETAIL_CLASSIFIER_HPP_INCLUDED
+#define BOOST_FT_DETAIL_CLASSIFIER_HPP_INCLUDED
+
+#include <ndnboost/type.hpp>
+#include <ndnboost/config.hpp>
+#include <ndnboost/type_traits/config.hpp>
+#include <ndnboost/type_traits/is_reference.hpp>
+#include <ndnboost/type_traits/add_reference.hpp>
+
+#include <ndnboost/function_types/config/config.hpp>
+#include <ndnboost/function_types/property_tags.hpp>
+
+namespace ndnboost { namespace function_types { namespace detail {
+
+template<typename T> struct classifier;
+
+template<std::size_t S> struct char_array { typedef char (&type)[S]; };
+
+template<bits_t Flags, bits_t CCID, std::size_t Arity> struct encode_charr
+{
+  typedef typename char_array<
+    ::ndnboost::function_types::detail::encode_charr_impl<Flags,CCID,Arity>::value 
+  >::type type;
+};
+
+char BOOST_TT_DECL classifier_impl(...);
+
+#define BOOST_FT_variations BOOST_FT_function|BOOST_FT_pointer|\
+                            BOOST_FT_member_pointer
+
+#define BOOST_FT_type_function(cc,name) BOOST_FT_SYNTAX( \
+    R BOOST_PP_EMPTY,BOOST_PP_LPAREN,cc,* BOOST_PP_EMPTY,name,BOOST_PP_RPAREN)
+
+#define BOOST_FT_type_function_pointer(cc,name) BOOST_FT_SYNTAX( \
+    R BOOST_PP_EMPTY,BOOST_PP_LPAREN,cc,** BOOST_PP_EMPTY,name,BOOST_PP_RPAREN)
+
+#define BOOST_FT_type_member_function_pointer(cc,name) BOOST_FT_SYNTAX( \
+    R BOOST_PP_EMPTY,BOOST_PP_LPAREN,cc,T0::** BOOST_PP_EMPTY,name,BOOST_PP_RPAREN)
+
+#define BOOST_FT_al_path boost/function_types/detail/classifier_impl
+#include <ndnboost/function_types/detail/pp_loop.hpp>
+
+template<typename T> struct classifier_bits
+{
+  static typename ndnboost::add_reference<T>::type tester;
+
+  BOOST_STATIC_CONSTANT(bits_t,value = (bits_t)sizeof(
+    ndnboost::function_types::detail::classifier_impl(& tester) 
+  )-1);
+};
+
+template<typename T> struct classifier
+{
+  typedef detail::constant<
+    ::ndnboost::function_types::detail::decode_bits<
+      ::ndnboost::function_types::detail::classifier_bits<T>::value
+    >::tag_bits > 
+  bits;
+
+  typedef detail::full_mask mask;
+ 
+  typedef detail::constant<
+    ::ndnboost::function_types::detail::decode_bits<
+      ::ndnboost::function_types::detail::classifier_bits<T>::value
+    >::arity > 
+  function_arity;
+};
+
+
+
+} } } // namespace ::ndnboost::function_types::detail
+
+#endif
+