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/function_types/detail/to_sequence.hpp b/ndnboost/function_types/detail/to_sequence.hpp
new file mode 100644
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+++ b/ndnboost/function_types/detail/to_sequence.hpp
@@ -0,0 +1,47 @@
+
+// (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_TO_SEQUENCE_HPP_INCLUDED
+#define BOOST_FT_DETAIL_TO_SEQUENCE_HPP_INCLUDED
+
+#include <ndnboost/mpl/eval_if.hpp>
+#include <ndnboost/mpl/identity.hpp>
+#include <ndnboost/mpl/is_sequence.hpp>
+#include <ndnboost/mpl/placeholders.hpp>
+#include <ndnboost/type_traits/add_reference.hpp>
+
+#include <ndnboost/function_types/is_callable_builtin.hpp>
+
+namespace ndnboost { namespace function_types { namespace detail {
+
+// wrap first arguments in components, if callable builtin type
+template<typename T>
+struct to_sequence
+{
+ typedef typename
+ mpl::eval_if
+ < is_callable_builtin<T>
+ , to_sequence< components<T> >
+ , mpl::identity< T >
+ >::type
+ type;
+};
+
+#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+// reduce template instantiations, if possible
+template<typename T, typename U>
+struct to_sequence< components<T,U> >
+{
+ typedef typename components<T,U>::types type;
+};
+#endif
+
+} } } // namespace ::ndnboost::function_types::detail
+
+#endif
+