Added boost header

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

@@ -0,0 +1,32 @@
+///////////////////////////////////////////////////////////////////////////////
+/// \file as_lvalue.hpp
+/// Contains definition the as_lvalue() functions.
+//
+//  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_TRANSFORM_AS_LVALUE_HPP_EAN_12_27_2007
+#define BOOST_PROTO_TRANSFORM_AS_LVALUE_HPP_EAN_12_27_2007
+
+#include <boost/proto/proto_fwd.hpp>
+
+namespace boost { namespace proto
+{
+    namespace detail
+    {
+        template<typename T>
+        T &as_lvalue(T &t)
+        {
+            return t;
+        }
+
+        template<typename T>
+        T const &as_lvalue(T const &t)
+        {
+            return t;
+        }
+    }
+}}
+
+#endif