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/utility/result_of.hpp b/ndnboost/utility/result_of.hpp
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+++ b/ndnboost/utility/result_of.hpp
@@ -0,0 +1,194 @@
+// Boost result_of library
+
+// Copyright Douglas Gregor 2004. Use, modification and
+// distribution is 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)
+
+// For more information, see http://www.boost.org/libs/utility
+#ifndef BOOST_RESULT_OF_HPP
+#define BOOST_RESULT_OF_HPP
+
+#include <ndnboost/config.hpp>
+#include <ndnboost/preprocessor/cat.hpp>
+#include <ndnboost/preprocessor/iteration/iterate.hpp>
+#include <ndnboost/preprocessor/repetition/enum_params.hpp>
+#include <ndnboost/preprocessor/repetition/enum_trailing_params.hpp>
+#include <ndnboost/preprocessor/repetition/enum_binary_params.hpp>
+#include <ndnboost/preprocessor/repetition/enum_shifted_params.hpp>
+#include <ndnboost/preprocessor/facilities/intercept.hpp>
+#include <ndnboost/detail/workaround.hpp>
+#include <ndnboost/mpl/has_xxx.hpp>
+#include <ndnboost/mpl/if.hpp>
+#include <ndnboost/mpl/eval_if.hpp>
+#include <ndnboost/mpl/bool.hpp>
+#include <ndnboost/mpl/identity.hpp>
+#include <ndnboost/mpl/or.hpp>
+#include <ndnboost/type_traits/is_class.hpp>
+#include <ndnboost/type_traits/is_pointer.hpp>
+#include <ndnboost/type_traits/is_member_function_pointer.hpp>
+#include <ndnboost/type_traits/remove_cv.hpp>
+#include <ndnboost/type_traits/remove_reference.hpp>
+#include <ndnboost/utility/declval.hpp>
+#include <ndnboost/utility/enable_if.hpp>
+
+#ifndef BOOST_RESULT_OF_NUM_ARGS
+# define BOOST_RESULT_OF_NUM_ARGS 16
+#endif
+
+// Use the decltype-based version of result_of by default if the compiler
+// supports N3276 <http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2011/n3276.pdf>.
+// The user can force the choice by defining either BOOST_RESULT_OF_USE_DECLTYPE or
+// BOOST_RESULT_OF_USE_TR1, but not both!
+#if defined(BOOST_RESULT_OF_USE_DECLTYPE) && defined(BOOST_RESULT_OF_USE_TR1)
+# error Both BOOST_RESULT_OF_USE_DECLTYPE and BOOST_RESULT_OF_USE_TR1 cannot be defined at the same time.
+#endif
+
+#ifndef BOOST_RESULT_OF_USE_TR1
+# ifndef BOOST_RESULT_OF_USE_DECLTYPE
+# ifndef BOOST_NO_CXX11_DECLTYPE_N3276 // this implies !defined(BOOST_NO_CXX11_DECLTYPE)
+# define BOOST_RESULT_OF_USE_DECLTYPE
+# else
+# define BOOST_RESULT_OF_USE_TR1
+# endif
+# endif
+#endif
+
+namespace ndnboost {
+
+template<typename F> struct result_of;
+template<typename F> struct tr1_result_of; // a TR1-style implementation of result_of
+
+#if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
+namespace detail {
+
+BOOST_MPL_HAS_XXX_TRAIT_DEF(result_type)
+
+template<typename F, typename FArgs, bool HasResultType> struct tr1_result_of_impl;
+
+#ifdef BOOST_NO_SFINAE_EXPR
+
+// There doesn't seem to be any other way to turn this off such that the presence of
+// the user-defined operator,() below doesn't cause spurious warning all over the place,
+// so unconditionally turn it off.
+#if BOOST_MSVC
+# pragma warning(disable: 4913) // user defined binary operator ',' exists but no overload could convert all operands, default built-in binary operator ',' used
+#endif
+
+struct result_of_private_type {};
+
+struct result_of_weird_type {
+ friend result_of_private_type operator,(result_of_private_type, result_of_weird_type);
+};
+
+typedef char result_of_yes_type; // sizeof(result_of_yes_type) == 1
+typedef char (&result_of_no_type)[2]; // sizeof(result_of_no_type) == 2
+
+template<typename T>
+result_of_no_type result_of_is_private_type(T const &);
+result_of_yes_type result_of_is_private_type(result_of_private_type);
+
+template<typename C>
+struct result_of_callable_class : C {
+ result_of_callable_class();
+ typedef result_of_private_type const &(*pfn_t)(...);
+ operator pfn_t() const volatile;
+};
+
+template<typename C>
+struct result_of_wrap_callable_class {
+ typedef result_of_callable_class<C> type;
+};
+
+template<typename C>
+struct result_of_wrap_callable_class<C const> {
+ typedef result_of_callable_class<C> const type;
+};
+
+template<typename C>
+struct result_of_wrap_callable_class<C volatile> {
+ typedef result_of_callable_class<C> volatile type;
+};
+
+template<typename C>
+struct result_of_wrap_callable_class<C const volatile> {
+ typedef result_of_callable_class<C> const volatile type;
+};
+
+template<typename C>
+struct result_of_wrap_callable_class<C &> {
+ typedef typename result_of_wrap_callable_class<C>::type &type;
+};
+
+template<typename F, bool TestCallability = true> struct cpp0x_result_of_impl;
+
+#else // BOOST_NO_SFINAE_EXPR
+
+template<typename T>
+struct result_of_always_void
+{
+ typedef void type;
+};
+
+template<typename F, typename Enable = void> struct cpp0x_result_of_impl {};
+
+#endif // BOOST_NO_SFINAE_EXPR
+
+template<typename F>
+struct result_of_void_impl
+{
+ typedef void type;
+};
+
+template<typename R>
+struct result_of_void_impl<R (*)(void)>
+{
+ typedef R type;
+};
+
+template<typename R>
+struct result_of_void_impl<R (&)(void)>
+{
+ typedef R type;
+};
+
+// Determine the return type of a function pointer or pointer to member.
+template<typename F, typename FArgs>
+struct result_of_pointer
+ : tr1_result_of_impl<typename remove_cv<F>::type, FArgs, false> { };
+
+template<typename F, typename FArgs>
+struct tr1_result_of_impl<F, FArgs, true>
+{
+ typedef typename F::result_type type;
+};
+
+template<typename FArgs>
+struct is_function_with_no_args : mpl::false_ {};
+
+template<typename F>
+struct is_function_with_no_args<F(void)> : mpl::true_ {};
+
+template<typename F, typename FArgs>
+struct result_of_nested_result : F::template result<FArgs>
+{};
+
+template<typename F, typename FArgs>
+struct tr1_result_of_impl<F, FArgs, false>
+ : mpl::if_<is_function_with_no_args<FArgs>,
+ result_of_void_impl<F>,
+ result_of_nested_result<F, FArgs> >::type
+{};
+
+} // end namespace detail
+
+#define BOOST_PP_ITERATION_PARAMS_1 (3,(0,BOOST_RESULT_OF_NUM_ARGS,<ndnboost/utility/detail/result_of_iterate.hpp>))
+#include BOOST_PP_ITERATE()
+
+#else
+# define BOOST_NO_RESULT_OF 1
+#endif
+
+}
+
+#endif // BOOST_RESULT_OF_HPP