In common.h, define func_lib for function objects. In configure.ac, define HAVE_STD_FUNCTION and HAVE_BOOST_FUNCTION. Include function headers in ndnboost.
diff --git a/ndnboost/preprocessor/seq/for_each_i.hpp b/ndnboost/preprocessor/seq/for_each_i.hpp
new file mode 100644
index 0000000..1b36baa
--- /dev/null
+++ b/ndnboost/preprocessor/seq/for_each_i.hpp
@@ -0,0 +1,61 @@
+# /* **************************************************************************
+# * *
+# * (C) Copyright Paul Mensonides 2002.
+# * 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 for most recent version. */
+#
+# ifndef BOOST_PREPROCESSOR_SEQ_FOR_EACH_I_HPP
+# define BOOST_PREPROCESSOR_SEQ_FOR_EACH_I_HPP
+#
+# include <ndnboost/preprocessor/arithmetic/dec.hpp>
+# include <ndnboost/preprocessor/arithmetic/inc.hpp>
+# include <ndnboost/preprocessor/config/config.hpp>
+# include <ndnboost/preprocessor/repetition/for.hpp>
+# include <ndnboost/preprocessor/seq/seq.hpp>
+# include <ndnboost/preprocessor/seq/size.hpp>
+# include <ndnboost/preprocessor/tuple/elem.hpp>
+# include <ndnboost/preprocessor/tuple/rem.hpp>
+#
+# /* BOOST_PP_SEQ_FOR_EACH_I */
+#
+# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
+# define BOOST_PP_SEQ_FOR_EACH_I(macro, data, seq) BOOST_PP_FOR((macro, data, seq (nil), 0), BOOST_PP_SEQ_FOR_EACH_I_P, BOOST_PP_SEQ_FOR_EACH_I_O, BOOST_PP_SEQ_FOR_EACH_I_M)
+# else
+# define BOOST_PP_SEQ_FOR_EACH_I(macro, data, seq) BOOST_PP_SEQ_FOR_EACH_I_I(macro, data, seq)
+# define BOOST_PP_SEQ_FOR_EACH_I_I(macro, data, seq) BOOST_PP_FOR((macro, data, seq (nil), 0), BOOST_PP_SEQ_FOR_EACH_I_P, BOOST_PP_SEQ_FOR_EACH_I_O, BOOST_PP_SEQ_FOR_EACH_I_M)
+# endif
+#
+# define BOOST_PP_SEQ_FOR_EACH_I_P(r, x) BOOST_PP_DEC(BOOST_PP_SEQ_SIZE(BOOST_PP_TUPLE_ELEM(4, 2, x)))
+#
+# if BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_STRICT()
+# define BOOST_PP_SEQ_FOR_EACH_I_O(r, x) BOOST_PP_SEQ_FOR_EACH_I_O_I x
+# else
+# define BOOST_PP_SEQ_FOR_EACH_I_O(r, x) BOOST_PP_SEQ_FOR_EACH_I_O_I(BOOST_PP_TUPLE_ELEM(4, 0, x), BOOST_PP_TUPLE_ELEM(4, 1, x), BOOST_PP_TUPLE_ELEM(4, 2, x), BOOST_PP_TUPLE_ELEM(4, 3, x))
+# endif
+#
+# define BOOST_PP_SEQ_FOR_EACH_I_O_I(macro, data, seq, i) (macro, data, BOOST_PP_SEQ_TAIL(seq), BOOST_PP_INC(i))
+#
+# if BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_STRICT()
+# define BOOST_PP_SEQ_FOR_EACH_I_M(r, x) BOOST_PP_SEQ_FOR_EACH_I_M_IM(r, BOOST_PP_TUPLE_REM_4 x)
+# define BOOST_PP_SEQ_FOR_EACH_I_M_IM(r, im) BOOST_PP_SEQ_FOR_EACH_I_M_I(r, im)
+# else
+# define BOOST_PP_SEQ_FOR_EACH_I_M(r, x) BOOST_PP_SEQ_FOR_EACH_I_M_I(r, BOOST_PP_TUPLE_ELEM(4, 0, x), BOOST_PP_TUPLE_ELEM(4, 1, x), BOOST_PP_TUPLE_ELEM(4, 2, x), BOOST_PP_TUPLE_ELEM(4, 3, x))
+# endif
+#
+# define BOOST_PP_SEQ_FOR_EACH_I_M_I(r, macro, data, seq, i) macro(r, data, i, BOOST_PP_SEQ_HEAD(seq))
+#
+# /* BOOST_PP_SEQ_FOR_EACH_I_R */
+#
+# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
+# define BOOST_PP_SEQ_FOR_EACH_I_R(r, macro, data, seq) BOOST_PP_FOR_ ## r((macro, data, seq (nil), 0), BOOST_PP_SEQ_FOR_EACH_I_P, BOOST_PP_SEQ_FOR_EACH_I_O, BOOST_PP_SEQ_FOR_EACH_I_M)
+# else
+# define BOOST_PP_SEQ_FOR_EACH_I_R(r, macro, data, seq) BOOST_PP_SEQ_FOR_EACH_I_R_I(r, macro, data, seq)
+# define BOOST_PP_SEQ_FOR_EACH_I_R_I(r, macro, data, seq) BOOST_PP_FOR_ ## r((macro, data, seq (nil), 0), BOOST_PP_SEQ_FOR_EACH_I_P, BOOST_PP_SEQ_FOR_EACH_I_O, BOOST_PP_SEQ_FOR_EACH_I_M)
+# endif
+#
+# endif