Added boost header

test/external/boost/mpl/set/aux_/at_impl.hpp

@@ -0,0 +1,40 @@
+
+#ifndef BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED
+#define BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2003-2004
+//
+// 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/mpl for documentation.
+
+// $Id: at_impl.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
+// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
+// $Revision: 49267 $
+
+#include <boost/mpl/at_fwd.hpp>
+#include <boost/mpl/set/aux_/has_key_impl.hpp>
+#include <boost/mpl/set/aux_/tag.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/void.hpp>
+
+namespace boost { namespace mpl {
+
+template<>
+struct at_impl< aux::set_tag >
+{
+    template< typename Set, typename T > struct apply
+    {
+        typedef typename if_< 
+              has_key_impl<aux::set_tag>::apply<Set,T>
+            , T
+            , void_
+            >::type type;            
+    };
+};
+
+}}
+
+#endif // BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED