diff --git a/ndnboost/function_types/detail/encoding/def.hpp b/ndnboost/function_types/detail/encoding/def.hpp
new file mode 100644
index 0000000..08074fb
--- /dev/null
+++ b/ndnboost/function_types/detail/encoding/def.hpp
@@ -0,0 +1,51 @@
+
+// (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).
+
+//------------------------------------------------------------------------------
+
+// no include guards, this file is intended for multiple inclusions
+
+// Type encoding:
+//
+// bit 0: callable builtin
+// bit 1: non member
+// bit 2: naked function
+// bit 3: pointer
+// bit 4: reference
+// bit 5: member pointer
+// bit 6: member function pointer
+// bit 7: member object pointer
+
+#define BOOST_FT_type_mask                            0x000000ff // 1111 1111 
+#define BOOST_FT_callable_builtin                     0x00000001 // 0000 0001
+#define BOOST_FT_non_member                           0x00000002 // 0000 0010
+#define BOOST_FT_function                             0x00000007 // 0000 0111
+#define BOOST_FT_pointer                              0x0000000b // 0000 1011
+#define BOOST_FT_reference                            0x00000013 // 0001 0011
+#define BOOST_FT_non_member_callable_builtin          0x00000003 // 0000 0011
+#define BOOST_FT_member_pointer                       0x00000020 // 0010 0000
+#define BOOST_FT_member_function_pointer              0x00000061 // 0110 0001
+#define BOOST_FT_member_object_pointer                0x000000a3 // 1010 0001
+#define BOOST_FT_member_object_pointer_flags          0x000002a3
+
+#define BOOST_FT_variadic                             0x00000100
+#define BOOST_FT_non_variadic                         0x00000200
+#define BOOST_FT_variadic_mask                        0x00000300
+
+#define BOOST_FT_const                                0x00000400
+#define BOOST_FT_volatile                             0x00000800
+
+#define BOOST_FT_default_cc                           0x00008000
+#define BOOST_FT_cc_mask                              0x00ff8000
+
+#define BOOST_FT_kind_mask                            0x000000fc 
+
+#define BOOST_FT_flags_mask                           0x00000fff
+#define BOOST_FT_full_mask                            0x00ff0fff
+
+#define BOOST_FT_arity_shift                          24
+#define BOOST_FT_arity_mask                           0x7f000000
+