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/is_function.hpp b/ndnboost/function_types/is_function.hpp
new file mode 100644
index 0000000..f6eb020
--- /dev/null
+++ b/ndnboost/function_types/is_function.hpp
@@ -0,0 +1,34 @@
+
+// (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_IS_FUNCTION_HPP_INCLUDED
+#define BOOST_FT_IS_FUNCTION_HPP_INCLUDED
+
+#include <ndnboost/mpl/aux_/lambda_support.hpp>
+#include <ndnboost/type_traits/detail/template_arity_spec.hpp>
+
+#include <ndnboost/function_types/components.hpp>
+
+namespace ndnboost
+{
+ namespace function_types
+ {
+ template< typename T, typename Tag = null_tag >
+ struct is_function
+ : function_types::represents
+ < function_types::components<T>
+ , function_types::tag<Tag ,detail::function_tag>
+ >
+ {
+ BOOST_MPL_AUX_LAMBDA_SUPPORT(2,is_function,(T,Tag))
+ };
+ }
+ BOOST_TT_AUX_TEMPLATE_ARITY_SPEC(2,function_types::is_function)
+}
+
+#endif
+