ndnboost: Include boost::iostreams for internal use.
diff --git a/include/ndnboost/iostreams/operations_fwd.hpp b/include/ndnboost/iostreams/operations_fwd.hpp
new file mode 100644
index 0000000..aee7990
--- /dev/null
+++ b/include/ndnboost/iostreams/operations_fwd.hpp
@@ -0,0 +1,41 @@
+// (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_OPERATIONS_FWD_HPP_INCLUDED
+#define NDNBOOST_IOSTREAMS_OPERATIONS_FWD_HPP_INCLUDED
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <ndnboost/mpl/not.hpp>
+#include <ndnboost/type_traits/is_base_and_derived.hpp>
+
+namespace ndnboost { namespace iostreams {
+
+template<typename T>
+struct operations;
+
+namespace detail {
+
+struct custom_tag { };
+
+template<typename T>
+struct is_custom
+ : mpl::not_<
+ is_base_and_derived< custom_tag, operations<T> >
+ >
+ { };
+
+} // End namespace detail.
+
+template<typename T>
+struct operations : detail::custom_tag { };
+
+} } // End namespaces iostreams, boost.
+
+#endif // #ifndef NDNBOOST_IOSTREAMS_OPERATIONS_FWD_HPP_INCLUDED //--------------//