ndnboost: Include boost::iostreams for internal use.
diff --git a/include/ndnboost/iostreams/flush.hpp b/include/ndnboost/iostreams/flush.hpp
new file mode 100644
index 0000000..e10df64
--- /dev/null
+++ b/include/ndnboost/iostreams/flush.hpp
@@ -0,0 +1,125 @@
+// (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_FLUSH_HPP_INCLUDED
+#define NDNBOOST_IOSTREAMS_FLUSH_HPP_INCLUDED
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <ndnboost/config.hpp> // DEDUCED_TYPENAME, MSVC.
+#include <ndnboost/detail/workaround.hpp>
+#include <ndnboost/iostreams/detail/dispatch.hpp>
+#include <ndnboost/iostreams/detail/streambuf.hpp>
+#include <ndnboost/iostreams/detail/wrap_unwrap.hpp>
+#include <ndnboost/iostreams/operations_fwd.hpp>
+#include <ndnboost/iostreams/traits.hpp>
+#include <ndnboost/mpl/if.hpp>
+
+// Must come last.
+#include <ndnboost/iostreams/detail/config/disable_warnings.hpp>
+
+namespace ndnboost { namespace iostreams {
+
+namespace detail {
+
+template<typename T>
+struct flush_device_impl;
+
+template<typename T>
+struct flush_filter_impl;
+
+} // End namespace detail.
+
+template<typename T>
+bool flush(T& t)
+{ return detail::flush_device_impl<T>::flush(detail::unwrap(t)); }
+
+template<typename T, typename Sink>
+bool flush(T& t, Sink& snk)
+{ return detail::flush_filter_impl<T>::flush(detail::unwrap(t), snk); }
+
+namespace detail {
+
+//------------------Definition of flush_device_impl---------------------------//
+
+template<typename T>
+struct flush_device_impl
+ : mpl::if_<
+ is_custom<T>,
+ operations<T>,
+ flush_device_impl<
+ NDNBOOST_DEDUCED_TYPENAME
+ dispatch<
+ T, ostream_tag, streambuf_tag, flushable_tag, any_tag
+ >::type
+ >
+ >::type
+ { };
+
+template<>
+struct flush_device_impl<ostream_tag> {
+ template<typename T>
+ static bool flush(T& t)
+ { return t.rdbuf()->NDNBOOST_IOSTREAMS_PUBSYNC() == 0; }
+};
+
+template<>
+struct flush_device_impl<streambuf_tag> {
+ template<typename T>
+ static bool flush(T& t)
+ { return t.NDNBOOST_IOSTREAMS_PUBSYNC() == 0; }
+};
+
+template<>
+struct flush_device_impl<flushable_tag> {
+ template<typename T>
+ static bool flush(T& t) { return t.flush(); }
+};
+
+template<>
+struct flush_device_impl<any_tag> {
+ template<typename T>
+ static bool flush(T&) { return true; }
+};
+
+//------------------Definition of flush_filter_impl---------------------------//
+
+template<typename T>
+struct flush_filter_impl
+ : mpl::if_<
+ is_custom<T>,
+ operations<T>,
+ flush_filter_impl<
+ NDNBOOST_DEDUCED_TYPENAME
+ dispatch<
+ T, flushable_tag, any_tag
+ >::type
+ >
+ >::type
+ { };
+
+template<>
+struct flush_filter_impl<flushable_tag> {
+ template<typename T, typename Sink>
+ static bool flush(T& t, Sink& snk) { return t.flush(snk); }
+};
+
+template<>
+struct flush_filter_impl<any_tag> {
+ template<typename T, typename Sink>
+ static bool flush(T&, Sink&) { return false; }
+};
+
+} // End namespace detail.
+
+} } // End namespaces iostreams, boost.
+
+#include <ndnboost/iostreams/detail/config/enable_warnings.hpp>
+
+#endif // #ifndef NDNBOOST_IOSTREAMS_FLUSH_HPP_INCLUDED