ndnboost: Include boost::iostreams for internal use.
diff --git a/include/ndnboost/iostreams/detail/call_traits.hpp b/include/ndnboost/iostreams/detail/call_traits.hpp
new file mode 100644
index 0000000..c917c1a
--- /dev/null
+++ b/include/ndnboost/iostreams/detail/call_traits.hpp
@@ -0,0 +1,32 @@
+// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
+// (C) Copyright 2003-2007 Jonathan Turkanis
+// 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/libs/iostreams for documentation.
+
+#ifndef NDNBOOST_IOSTREAMS_DETAIL_VALUE_TYPE_HPP_INCLUDED
+#define NDNBOOST_IOSTREAMS_DETAIL_VALUE_TYPE_HPP_INCLUDED
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <ndnboost/iostreams/traits.hpp>
+#include <ndnboost/mpl/if.hpp>
+
+namespace ndnboost { namespace iostreams { namespace detail {
+
+template<typename T>
+struct param_type {
+ typedef typename mpl::if_<is_std_io<T>, T&, const T&>::type type;
+};
+
+template<typename T>
+struct value_type {
+ typedef typename mpl::if_<is_std_io<T>, T&, T>::type type;
+};
+
+} } } // End namespaces detail, iostreams, boost.
+
+#endif // #ifndef NDNBOOST_IOSTREAMS_DETAIL_VALUE_TYPE_HPP_INCLUDED //-----------//