Added boost header

test/external/boost/proto/detail/ignore_unused.hpp

@@ -0,0 +1,23 @@
+///////////////////////////////////////////////////////////////////////////////
+/// \file ignore_unused.hpp
+/// Definintion of ignore_unused, a dummy function for suppressing compiler
+/// warnings
+//
+//  Copyright 2008 Eric Niebler. 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)
+
+#ifndef BOOST_PROTO_DETAIL_IGNORE_UNUSED_HPP_EAN_03_03_2008
+#define BOOST_PROTO_DETAIL_IGNORE_UNUSED_HPP_EAN_03_03_2008
+
+namespace boost { namespace proto
+{
+    namespace detail
+    {
+        template<typename T>
+        inline void ignore_unused(T const &)
+        {}
+    }
+}}
+
+#endif