diff --git a/ndnboost/function_types/detail/synthesize_impl/arity20_0.hpp b/ndnboost/function_types/detail/synthesize_impl/arity20_0.hpp
new file mode 100644
index 0000000..86988d7
--- /dev/null
+++ b/ndnboost/function_types/detail/synthesize_impl/arity20_0.hpp
@@ -0,0 +1,517 @@
+
+// (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 inclusion
+
+// input:  BOOST_FT_syntax     type macro to use
+// input:  BOOST_FT_cc         empty or cc specifier 
+// input:  BOOST_FT_ell        empty or "..."
+// input:  BOOST_FT_cv         empty or cv qualifiers
+// input:  BOOST_FT_flags      single decimal integer encoding the flags
+// output: BOOST_FT_n          number of component types (arity+1)
+// output: BOOST_FT_arity      current arity
+// output: BOOST_FT_type       macro that expands to the type
+// output: BOOST_FT_tplargs(p) template arguments with given prefix
+// output: BOOST_FT_params(p)  parameters with given prefix
+
+# include <ndnboost/function_types/detail/synthesize_impl/arity10_0.hpp>
+# define BOOST_FT_make_type(flags,cc,arity) BOOST_FT_make_type_impl(flags,cc,arity)
+# define BOOST_FT_make_type_impl(flags,cc,arity) make_type_ ## flags ## _ ## cc ## _ ## arity
+template< typename R , typename T0 , typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 , typename T7 , typename T8 , typename T9 , typename T10 >
+struct BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,11)
+{
+typedef BOOST_FT_syntax(BOOST_FT_cc,type BOOST_PP_EMPTY) (T0 , T1 , T2 , T3 , T4 , T5 , T6 , T7 , T8 , T9 , T10 BOOST_FT_ell) BOOST_FT_cv ;
+};
+template< > 
+struct synthesize_impl_o< BOOST_FT_flags, BOOST_FT_cc_id, 12 > 
+{ 
+template<typename S> struct synthesize_impl_i
+{
+private:
+typedef typename mpl::begin<S> ::type iter_0;
+typedef typename mpl::next< iter_0 > ::type iter_1;
+typedef typename mpl::next< iter_1 > ::type iter_2;
+typedef typename mpl::next< iter_2 > ::type iter_3;
+typedef typename mpl::next< iter_3 > ::type iter_4;
+typedef typename mpl::next< iter_4 > ::type iter_5;
+typedef typename mpl::next< iter_5 > ::type iter_6;
+typedef typename mpl::next< iter_6 > ::type iter_7;
+typedef typename mpl::next< iter_7 > ::type iter_8;
+typedef typename mpl::next< iter_8 > ::type iter_9;
+typedef typename mpl::next< iter_9 > ::type iter_10;
+typedef typename mpl::next< iter_10 > ::type iter_11;
+public:
+typedef typename detail::BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,11) 
+< typename mpl::deref< iter_0 > ::type 
+, typename mpl::deref< iter_1 > ::type
+, typename mpl::deref< iter_2 > ::type
+, typename mpl::deref< iter_3 > ::type
+, typename mpl::deref< iter_4 > ::type
+, typename mpl::deref< iter_5 > ::type
+, typename mpl::deref< iter_6 > ::type
+, typename mpl::deref< iter_7 > ::type
+, typename mpl::deref< iter_8 > ::type
+, typename mpl::deref< iter_9 > ::type
+, typename mpl::deref< iter_10 > ::type
+, typename mpl::deref< iter_11 > ::type
+> ::type type;
+};
+};
+template< typename R , typename T0 , typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 , typename T7 , typename T8 , typename T9 , typename T10 , typename T11 >
+struct BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,12)
+{
+typedef BOOST_FT_syntax(BOOST_FT_cc,type BOOST_PP_EMPTY) (T0 , T1 , T2 , T3 , T4 , T5 , T6 , T7 , T8 , T9 , T10 , T11 BOOST_FT_ell) BOOST_FT_cv ;
+};
+template< > 
+struct synthesize_impl_o< BOOST_FT_flags, BOOST_FT_cc_id, 13 > 
+{ 
+template<typename S> struct synthesize_impl_i
+{
+private:
+typedef typename mpl::begin<S> ::type iter_0;
+typedef typename mpl::next< iter_0 > ::type iter_1;
+typedef typename mpl::next< iter_1 > ::type iter_2;
+typedef typename mpl::next< iter_2 > ::type iter_3;
+typedef typename mpl::next< iter_3 > ::type iter_4;
+typedef typename mpl::next< iter_4 > ::type iter_5;
+typedef typename mpl::next< iter_5 > ::type iter_6;
+typedef typename mpl::next< iter_6 > ::type iter_7;
+typedef typename mpl::next< iter_7 > ::type iter_8;
+typedef typename mpl::next< iter_8 > ::type iter_9;
+typedef typename mpl::next< iter_9 > ::type iter_10;
+typedef typename mpl::next< iter_10 > ::type iter_11;
+typedef typename mpl::next< iter_11 > ::type iter_12;
+public:
+typedef typename detail::BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,12) 
+< typename mpl::deref< iter_0 > ::type 
+, typename mpl::deref< iter_1 > ::type
+, typename mpl::deref< iter_2 > ::type
+, typename mpl::deref< iter_3 > ::type
+, typename mpl::deref< iter_4 > ::type
+, typename mpl::deref< iter_5 > ::type
+, typename mpl::deref< iter_6 > ::type
+, typename mpl::deref< iter_7 > ::type
+, typename mpl::deref< iter_8 > ::type
+, typename mpl::deref< iter_9 > ::type
+, typename mpl::deref< iter_10 > ::type
+, typename mpl::deref< iter_11 > ::type
+, typename mpl::deref< iter_12 > ::type
+> ::type type;
+};
+};
+template< typename R , typename T0 , typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 , typename T7 , typename T8 , typename T9 , typename T10 , typename T11 , typename T12 >
+struct BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,13)
+{
+typedef BOOST_FT_syntax(BOOST_FT_cc,type BOOST_PP_EMPTY) (T0 , T1 , T2 , T3 , T4 , T5 , T6 , T7 , T8 , T9 , T10 , T11 , T12 BOOST_FT_ell) BOOST_FT_cv ;
+};
+template< > 
+struct synthesize_impl_o< BOOST_FT_flags, BOOST_FT_cc_id, 14 > 
+{ 
+template<typename S> struct synthesize_impl_i
+{
+private:
+typedef typename mpl::begin<S> ::type iter_0;
+typedef typename mpl::next< iter_0 > ::type iter_1;
+typedef typename mpl::next< iter_1 > ::type iter_2;
+typedef typename mpl::next< iter_2 > ::type iter_3;
+typedef typename mpl::next< iter_3 > ::type iter_4;
+typedef typename mpl::next< iter_4 > ::type iter_5;
+typedef typename mpl::next< iter_5 > ::type iter_6;
+typedef typename mpl::next< iter_6 > ::type iter_7;
+typedef typename mpl::next< iter_7 > ::type iter_8;
+typedef typename mpl::next< iter_8 > ::type iter_9;
+typedef typename mpl::next< iter_9 > ::type iter_10;
+typedef typename mpl::next< iter_10 > ::type iter_11;
+typedef typename mpl::next< iter_11 > ::type iter_12;
+typedef typename mpl::next< iter_12 > ::type iter_13;
+public:
+typedef typename detail::BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,13) 
+< typename mpl::deref< iter_0 > ::type 
+, typename mpl::deref< iter_1 > ::type
+, typename mpl::deref< iter_2 > ::type
+, typename mpl::deref< iter_3 > ::type
+, typename mpl::deref< iter_4 > ::type
+, typename mpl::deref< iter_5 > ::type
+, typename mpl::deref< iter_6 > ::type
+, typename mpl::deref< iter_7 > ::type
+, typename mpl::deref< iter_8 > ::type
+, typename mpl::deref< iter_9 > ::type
+, typename mpl::deref< iter_10 > ::type
+, typename mpl::deref< iter_11 > ::type
+, typename mpl::deref< iter_12 > ::type
+, typename mpl::deref< iter_13 > ::type
+> ::type type;
+};
+};
+template< typename R , typename T0 , typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 , typename T7 , typename T8 , typename T9 , typename T10 , typename T11 , typename T12 , typename T13 >
+struct BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,14)
+{
+typedef BOOST_FT_syntax(BOOST_FT_cc,type BOOST_PP_EMPTY) (T0 , T1 , T2 , T3 , T4 , T5 , T6 , T7 , T8 , T9 , T10 , T11 , T12 , T13 BOOST_FT_ell) BOOST_FT_cv ;
+};
+template< > 
+struct synthesize_impl_o< BOOST_FT_flags, BOOST_FT_cc_id, 15 > 
+{ 
+template<typename S> struct synthesize_impl_i
+{
+private:
+typedef typename mpl::begin<S> ::type iter_0;
+typedef typename mpl::next< iter_0 > ::type iter_1;
+typedef typename mpl::next< iter_1 > ::type iter_2;
+typedef typename mpl::next< iter_2 > ::type iter_3;
+typedef typename mpl::next< iter_3 > ::type iter_4;
+typedef typename mpl::next< iter_4 > ::type iter_5;
+typedef typename mpl::next< iter_5 > ::type iter_6;
+typedef typename mpl::next< iter_6 > ::type iter_7;
+typedef typename mpl::next< iter_7 > ::type iter_8;
+typedef typename mpl::next< iter_8 > ::type iter_9;
+typedef typename mpl::next< iter_9 > ::type iter_10;
+typedef typename mpl::next< iter_10 > ::type iter_11;
+typedef typename mpl::next< iter_11 > ::type iter_12;
+typedef typename mpl::next< iter_12 > ::type iter_13;
+typedef typename mpl::next< iter_13 > ::type iter_14;
+public:
+typedef typename detail::BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,14) 
+< typename mpl::deref< iter_0 > ::type 
+, typename mpl::deref< iter_1 > ::type
+, typename mpl::deref< iter_2 > ::type
+, typename mpl::deref< iter_3 > ::type
+, typename mpl::deref< iter_4 > ::type
+, typename mpl::deref< iter_5 > ::type
+, typename mpl::deref< iter_6 > ::type
+, typename mpl::deref< iter_7 > ::type
+, typename mpl::deref< iter_8 > ::type
+, typename mpl::deref< iter_9 > ::type
+, typename mpl::deref< iter_10 > ::type
+, typename mpl::deref< iter_11 > ::type
+, typename mpl::deref< iter_12 > ::type
+, typename mpl::deref< iter_13 > ::type
+, typename mpl::deref< iter_14 > ::type
+> ::type type;
+};
+};
+template< typename R , typename T0 , typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 , typename T7 , typename T8 , typename T9 , typename T10 , typename T11 , typename T12 , typename T13 , typename T14 >
+struct BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,15)
+{
+typedef BOOST_FT_syntax(BOOST_FT_cc,type BOOST_PP_EMPTY) (T0 , T1 , T2 , T3 , T4 , T5 , T6 , T7 , T8 , T9 , T10 , T11 , T12 , T13 , T14 BOOST_FT_ell) BOOST_FT_cv ;
+};
+template< > 
+struct synthesize_impl_o< BOOST_FT_flags, BOOST_FT_cc_id, 16 > 
+{ 
+template<typename S> struct synthesize_impl_i
+{
+private:
+typedef typename mpl::begin<S> ::type iter_0;
+typedef typename mpl::next< iter_0 > ::type iter_1;
+typedef typename mpl::next< iter_1 > ::type iter_2;
+typedef typename mpl::next< iter_2 > ::type iter_3;
+typedef typename mpl::next< iter_3 > ::type iter_4;
+typedef typename mpl::next< iter_4 > ::type iter_5;
+typedef typename mpl::next< iter_5 > ::type iter_6;
+typedef typename mpl::next< iter_6 > ::type iter_7;
+typedef typename mpl::next< iter_7 > ::type iter_8;
+typedef typename mpl::next< iter_8 > ::type iter_9;
+typedef typename mpl::next< iter_9 > ::type iter_10;
+typedef typename mpl::next< iter_10 > ::type iter_11;
+typedef typename mpl::next< iter_11 > ::type iter_12;
+typedef typename mpl::next< iter_12 > ::type iter_13;
+typedef typename mpl::next< iter_13 > ::type iter_14;
+typedef typename mpl::next< iter_14 > ::type iter_15;
+public:
+typedef typename detail::BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,15) 
+< typename mpl::deref< iter_0 > ::type 
+, typename mpl::deref< iter_1 > ::type
+, typename mpl::deref< iter_2 > ::type
+, typename mpl::deref< iter_3 > ::type
+, typename mpl::deref< iter_4 > ::type
+, typename mpl::deref< iter_5 > ::type
+, typename mpl::deref< iter_6 > ::type
+, typename mpl::deref< iter_7 > ::type
+, typename mpl::deref< iter_8 > ::type
+, typename mpl::deref< iter_9 > ::type
+, typename mpl::deref< iter_10 > ::type
+, typename mpl::deref< iter_11 > ::type
+, typename mpl::deref< iter_12 > ::type
+, typename mpl::deref< iter_13 > ::type
+, typename mpl::deref< iter_14 > ::type
+, typename mpl::deref< iter_15 > ::type
+> ::type type;
+};
+};
+template< typename R , typename T0 , typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 , typename T7 , typename T8 , typename T9 , typename T10 , typename T11 , typename T12 , typename T13 , typename T14 , typename T15 >
+struct BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,16)
+{
+typedef BOOST_FT_syntax(BOOST_FT_cc,type BOOST_PP_EMPTY) (T0 , T1 , T2 , T3 , T4 , T5 , T6 , T7 , T8 , T9 , T10 , T11 , T12 , T13 , T14 , T15 BOOST_FT_ell) BOOST_FT_cv ;
+};
+template< > 
+struct synthesize_impl_o< BOOST_FT_flags, BOOST_FT_cc_id, 17 > 
+{ 
+template<typename S> struct synthesize_impl_i
+{
+private:
+typedef typename mpl::begin<S> ::type iter_0;
+typedef typename mpl::next< iter_0 > ::type iter_1;
+typedef typename mpl::next< iter_1 > ::type iter_2;
+typedef typename mpl::next< iter_2 > ::type iter_3;
+typedef typename mpl::next< iter_3 > ::type iter_4;
+typedef typename mpl::next< iter_4 > ::type iter_5;
+typedef typename mpl::next< iter_5 > ::type iter_6;
+typedef typename mpl::next< iter_6 > ::type iter_7;
+typedef typename mpl::next< iter_7 > ::type iter_8;
+typedef typename mpl::next< iter_8 > ::type iter_9;
+typedef typename mpl::next< iter_9 > ::type iter_10;
+typedef typename mpl::next< iter_10 > ::type iter_11;
+typedef typename mpl::next< iter_11 > ::type iter_12;
+typedef typename mpl::next< iter_12 > ::type iter_13;
+typedef typename mpl::next< iter_13 > ::type iter_14;
+typedef typename mpl::next< iter_14 > ::type iter_15;
+typedef typename mpl::next< iter_15 > ::type iter_16;
+public:
+typedef typename detail::BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,16) 
+< typename mpl::deref< iter_0 > ::type 
+, typename mpl::deref< iter_1 > ::type
+, typename mpl::deref< iter_2 > ::type
+, typename mpl::deref< iter_3 > ::type
+, typename mpl::deref< iter_4 > ::type
+, typename mpl::deref< iter_5 > ::type
+, typename mpl::deref< iter_6 > ::type
+, typename mpl::deref< iter_7 > ::type
+, typename mpl::deref< iter_8 > ::type
+, typename mpl::deref< iter_9 > ::type
+, typename mpl::deref< iter_10 > ::type
+, typename mpl::deref< iter_11 > ::type
+, typename mpl::deref< iter_12 > ::type
+, typename mpl::deref< iter_13 > ::type
+, typename mpl::deref< iter_14 > ::type
+, typename mpl::deref< iter_15 > ::type
+, typename mpl::deref< iter_16 > ::type
+> ::type type;
+};
+};
+template< typename R , typename T0 , typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 , typename T7 , typename T8 , typename T9 , typename T10 , typename T11 , typename T12 , typename T13 , typename T14 , typename T15 , typename T16 >
+struct BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,17)
+{
+typedef BOOST_FT_syntax(BOOST_FT_cc,type BOOST_PP_EMPTY) (T0 , T1 , T2 , T3 , T4 , T5 , T6 , T7 , T8 , T9 , T10 , T11 , T12 , T13 , T14 , T15 , T16 BOOST_FT_ell) BOOST_FT_cv ;
+};
+template< > 
+struct synthesize_impl_o< BOOST_FT_flags, BOOST_FT_cc_id, 18 > 
+{ 
+template<typename S> struct synthesize_impl_i
+{
+private:
+typedef typename mpl::begin<S> ::type iter_0;
+typedef typename mpl::next< iter_0 > ::type iter_1;
+typedef typename mpl::next< iter_1 > ::type iter_2;
+typedef typename mpl::next< iter_2 > ::type iter_3;
+typedef typename mpl::next< iter_3 > ::type iter_4;
+typedef typename mpl::next< iter_4 > ::type iter_5;
+typedef typename mpl::next< iter_5 > ::type iter_6;
+typedef typename mpl::next< iter_6 > ::type iter_7;
+typedef typename mpl::next< iter_7 > ::type iter_8;
+typedef typename mpl::next< iter_8 > ::type iter_9;
+typedef typename mpl::next< iter_9 > ::type iter_10;
+typedef typename mpl::next< iter_10 > ::type iter_11;
+typedef typename mpl::next< iter_11 > ::type iter_12;
+typedef typename mpl::next< iter_12 > ::type iter_13;
+typedef typename mpl::next< iter_13 > ::type iter_14;
+typedef typename mpl::next< iter_14 > ::type iter_15;
+typedef typename mpl::next< iter_15 > ::type iter_16;
+typedef typename mpl::next< iter_16 > ::type iter_17;
+public:
+typedef typename detail::BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,17) 
+< typename mpl::deref< iter_0 > ::type 
+, typename mpl::deref< iter_1 > ::type
+, typename mpl::deref< iter_2 > ::type
+, typename mpl::deref< iter_3 > ::type
+, typename mpl::deref< iter_4 > ::type
+, typename mpl::deref< iter_5 > ::type
+, typename mpl::deref< iter_6 > ::type
+, typename mpl::deref< iter_7 > ::type
+, typename mpl::deref< iter_8 > ::type
+, typename mpl::deref< iter_9 > ::type
+, typename mpl::deref< iter_10 > ::type
+, typename mpl::deref< iter_11 > ::type
+, typename mpl::deref< iter_12 > ::type
+, typename mpl::deref< iter_13 > ::type
+, typename mpl::deref< iter_14 > ::type
+, typename mpl::deref< iter_15 > ::type
+, typename mpl::deref< iter_16 > ::type
+, typename mpl::deref< iter_17 > ::type
+> ::type type;
+};
+};
+template< typename R , typename T0 , typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 , typename T7 , typename T8 , typename T9 , typename T10 , typename T11 , typename T12 , typename T13 , typename T14 , typename T15 , typename T16 , typename T17 >
+struct BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,18)
+{
+typedef BOOST_FT_syntax(BOOST_FT_cc,type BOOST_PP_EMPTY) (T0 , T1 , T2 , T3 , T4 , T5 , T6 , T7 , T8 , T9 , T10 , T11 , T12 , T13 , T14 , T15 , T16 , T17 BOOST_FT_ell) BOOST_FT_cv ;
+};
+template< > 
+struct synthesize_impl_o< BOOST_FT_flags, BOOST_FT_cc_id, 19 > 
+{ 
+template<typename S> struct synthesize_impl_i
+{
+private:
+typedef typename mpl::begin<S> ::type iter_0;
+typedef typename mpl::next< iter_0 > ::type iter_1;
+typedef typename mpl::next< iter_1 > ::type iter_2;
+typedef typename mpl::next< iter_2 > ::type iter_3;
+typedef typename mpl::next< iter_3 > ::type iter_4;
+typedef typename mpl::next< iter_4 > ::type iter_5;
+typedef typename mpl::next< iter_5 > ::type iter_6;
+typedef typename mpl::next< iter_6 > ::type iter_7;
+typedef typename mpl::next< iter_7 > ::type iter_8;
+typedef typename mpl::next< iter_8 > ::type iter_9;
+typedef typename mpl::next< iter_9 > ::type iter_10;
+typedef typename mpl::next< iter_10 > ::type iter_11;
+typedef typename mpl::next< iter_11 > ::type iter_12;
+typedef typename mpl::next< iter_12 > ::type iter_13;
+typedef typename mpl::next< iter_13 > ::type iter_14;
+typedef typename mpl::next< iter_14 > ::type iter_15;
+typedef typename mpl::next< iter_15 > ::type iter_16;
+typedef typename mpl::next< iter_16 > ::type iter_17;
+typedef typename mpl::next< iter_17 > ::type iter_18;
+public:
+typedef typename detail::BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,18) 
+< typename mpl::deref< iter_0 > ::type 
+, typename mpl::deref< iter_1 > ::type
+, typename mpl::deref< iter_2 > ::type
+, typename mpl::deref< iter_3 > ::type
+, typename mpl::deref< iter_4 > ::type
+, typename mpl::deref< iter_5 > ::type
+, typename mpl::deref< iter_6 > ::type
+, typename mpl::deref< iter_7 > ::type
+, typename mpl::deref< iter_8 > ::type
+, typename mpl::deref< iter_9 > ::type
+, typename mpl::deref< iter_10 > ::type
+, typename mpl::deref< iter_11 > ::type
+, typename mpl::deref< iter_12 > ::type
+, typename mpl::deref< iter_13 > ::type
+, typename mpl::deref< iter_14 > ::type
+, typename mpl::deref< iter_15 > ::type
+, typename mpl::deref< iter_16 > ::type
+, typename mpl::deref< iter_17 > ::type
+, typename mpl::deref< iter_18 > ::type
+> ::type type;
+};
+};
+template< typename R , typename T0 , typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 , typename T7 , typename T8 , typename T9 , typename T10 , typename T11 , typename T12 , typename T13 , typename T14 , typename T15 , typename T16 , typename T17 , typename T18 >
+struct BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,19)
+{
+typedef BOOST_FT_syntax(BOOST_FT_cc,type BOOST_PP_EMPTY) (T0 , T1 , T2 , T3 , T4 , T5 , T6 , T7 , T8 , T9 , T10 , T11 , T12 , T13 , T14 , T15 , T16 , T17 , T18 BOOST_FT_ell) BOOST_FT_cv ;
+};
+template< > 
+struct synthesize_impl_o< BOOST_FT_flags, BOOST_FT_cc_id, 20 > 
+{ 
+template<typename S> struct synthesize_impl_i
+{
+private:
+typedef typename mpl::begin<S> ::type iter_0;
+typedef typename mpl::next< iter_0 > ::type iter_1;
+typedef typename mpl::next< iter_1 > ::type iter_2;
+typedef typename mpl::next< iter_2 > ::type iter_3;
+typedef typename mpl::next< iter_3 > ::type iter_4;
+typedef typename mpl::next< iter_4 > ::type iter_5;
+typedef typename mpl::next< iter_5 > ::type iter_6;
+typedef typename mpl::next< iter_6 > ::type iter_7;
+typedef typename mpl::next< iter_7 > ::type iter_8;
+typedef typename mpl::next< iter_8 > ::type iter_9;
+typedef typename mpl::next< iter_9 > ::type iter_10;
+typedef typename mpl::next< iter_10 > ::type iter_11;
+typedef typename mpl::next< iter_11 > ::type iter_12;
+typedef typename mpl::next< iter_12 > ::type iter_13;
+typedef typename mpl::next< iter_13 > ::type iter_14;
+typedef typename mpl::next< iter_14 > ::type iter_15;
+typedef typename mpl::next< iter_15 > ::type iter_16;
+typedef typename mpl::next< iter_16 > ::type iter_17;
+typedef typename mpl::next< iter_17 > ::type iter_18;
+typedef typename mpl::next< iter_18 > ::type iter_19;
+public:
+typedef typename detail::BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,19) 
+< typename mpl::deref< iter_0 > ::type 
+, typename mpl::deref< iter_1 > ::type
+, typename mpl::deref< iter_2 > ::type
+, typename mpl::deref< iter_3 > ::type
+, typename mpl::deref< iter_4 > ::type
+, typename mpl::deref< iter_5 > ::type
+, typename mpl::deref< iter_6 > ::type
+, typename mpl::deref< iter_7 > ::type
+, typename mpl::deref< iter_8 > ::type
+, typename mpl::deref< iter_9 > ::type
+, typename mpl::deref< iter_10 > ::type
+, typename mpl::deref< iter_11 > ::type
+, typename mpl::deref< iter_12 > ::type
+, typename mpl::deref< iter_13 > ::type
+, typename mpl::deref< iter_14 > ::type
+, typename mpl::deref< iter_15 > ::type
+, typename mpl::deref< iter_16 > ::type
+, typename mpl::deref< iter_17 > ::type
+, typename mpl::deref< iter_18 > ::type
+, typename mpl::deref< iter_19 > ::type
+> ::type type;
+};
+};
+template< typename R , typename T0 , typename T1 , typename T2 , typename T3 , typename T4 , typename T5 , typename T6 , typename T7 , typename T8 , typename T9 , typename T10 , typename T11 , typename T12 , typename T13 , typename T14 , typename T15 , typename T16 , typename T17 , typename T18 , typename T19 >
+struct BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,20)
+{
+typedef BOOST_FT_syntax(BOOST_FT_cc,type BOOST_PP_EMPTY) (T0 , T1 , T2 , T3 , T4 , T5 , T6 , T7 , T8 , T9 , T10 , T11 , T12 , T13 , T14 , T15 , T16 , T17 , T18 , T19 BOOST_FT_ell) BOOST_FT_cv ;
+};
+template< > 
+struct synthesize_impl_o< BOOST_FT_flags, BOOST_FT_cc_id, 21 > 
+{ 
+template<typename S> struct synthesize_impl_i
+{
+private:
+typedef typename mpl::begin<S> ::type iter_0;
+typedef typename mpl::next< iter_0 > ::type iter_1;
+typedef typename mpl::next< iter_1 > ::type iter_2;
+typedef typename mpl::next< iter_2 > ::type iter_3;
+typedef typename mpl::next< iter_3 > ::type iter_4;
+typedef typename mpl::next< iter_4 > ::type iter_5;
+typedef typename mpl::next< iter_5 > ::type iter_6;
+typedef typename mpl::next< iter_6 > ::type iter_7;
+typedef typename mpl::next< iter_7 > ::type iter_8;
+typedef typename mpl::next< iter_8 > ::type iter_9;
+typedef typename mpl::next< iter_9 > ::type iter_10;
+typedef typename mpl::next< iter_10 > ::type iter_11;
+typedef typename mpl::next< iter_11 > ::type iter_12;
+typedef typename mpl::next< iter_12 > ::type iter_13;
+typedef typename mpl::next< iter_13 > ::type iter_14;
+typedef typename mpl::next< iter_14 > ::type iter_15;
+typedef typename mpl::next< iter_15 > ::type iter_16;
+typedef typename mpl::next< iter_16 > ::type iter_17;
+typedef typename mpl::next< iter_17 > ::type iter_18;
+typedef typename mpl::next< iter_18 > ::type iter_19;
+typedef typename mpl::next< iter_19 > ::type iter_20;
+public:
+typedef typename detail::BOOST_FT_make_type(BOOST_FT_flags,BOOST_FT_cc_id,20) 
+< typename mpl::deref< iter_0 > ::type 
+, typename mpl::deref< iter_1 > ::type
+, typename mpl::deref< iter_2 > ::type
+, typename mpl::deref< iter_3 > ::type
+, typename mpl::deref< iter_4 > ::type
+, typename mpl::deref< iter_5 > ::type
+, typename mpl::deref< iter_6 > ::type
+, typename mpl::deref< iter_7 > ::type
+, typename mpl::deref< iter_8 > ::type
+, typename mpl::deref< iter_9 > ::type
+, typename mpl::deref< iter_10 > ::type
+, typename mpl::deref< iter_11 > ::type
+, typename mpl::deref< iter_12 > ::type
+, typename mpl::deref< iter_13 > ::type
+, typename mpl::deref< iter_14 > ::type
+, typename mpl::deref< iter_15 > ::type
+, typename mpl::deref< iter_16 > ::type
+, typename mpl::deref< iter_17 > ::type
+, typename mpl::deref< iter_18 > ::type
+, typename mpl::deref< iter_19 > ::type
+, typename mpl::deref< iter_20 > ::type
+> ::type type;
+};
+};
+# undef BOOST_FT_make_type
+# undef BOOST_FT_make_type_impl
+