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/functional/value_factory.hpp b/ndnboost/functional/value_factory.hpp
new file mode 100644
index 0000000..c917519
--- /dev/null
+++ b/ndnboost/functional/value_factory.hpp
@@ -0,0 +1,70 @@
+/*=============================================================================
+ Copyright (c) 2007 Tobias Schwinger
+
+ Use modification and distribution are subject to 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).
+==============================================================================*/
+
+#ifndef BOOST_FUNCTIONAL_VALUE_FACTORY_HPP_INCLUDED
+# ifndef BOOST_PP_IS_ITERATING
+
+# include <ndnboost/preprocessor/iteration/iterate.hpp>
+# include <ndnboost/preprocessor/repetition/enum_params.hpp>
+# include <ndnboost/preprocessor/repetition/enum_binary_params.hpp>
+
+# include <new>
+# include <ndnboost/pointee.hpp>
+# include <ndnboost/none_t.hpp>
+# include <ndnboost/get_pointer.hpp>
+# include <ndnboost/non_type.hpp>
+# include <ndnboost/type_traits/remove_cv.hpp>
+
+# ifndef BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY
+# define BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY 10
+# elif BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY < 3
+# undef BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY
+# define BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY 3
+# endif
+
+namespace ndnboost
+{
+ template< typename T >
+ class value_factory;
+
+ //----- ---- --- -- - - - -
+
+ template< typename T >
+ class value_factory
+ {
+ public:
+ typedef T result_type;
+
+ value_factory()
+ { }
+
+# define BOOST_PP_FILENAME_1 <ndnboost/functional/value_factory.hpp>
+# define BOOST_PP_ITERATION_LIMITS (0,BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY)
+# include BOOST_PP_ITERATE()
+ };
+
+ template< typename T > class value_factory<T&>;
+ // forbidden, would create a dangling reference
+}
+# define BOOST_FUNCTIONAL_VALUE_FACTORY_HPP_INCLUDED
+# else // defined(BOOST_PP_IS_ITERATING)
+
+# define N BOOST_PP_ITERATION()
+# if N > 0
+ template< BOOST_PP_ENUM_PARAMS(N, typename T) >
+# endif
+ inline result_type operator()(BOOST_PP_ENUM_BINARY_PARAMS(N,T,& a)) const
+ {
+ return result_type(BOOST_PP_ENUM_PARAMS(N,a));
+ }
+# undef N
+
+# endif // defined(BOOST_PP_IS_ITERATING)
+
+#endif // include guard
+