add boost on mac

macx64/include/boost/phoenix/object/detail/target.hpp

@@ -0,0 +1,47 @@
+/*==============================================================================
+    Copyright (c) 2001-2010 Joel de Guzman
+    Copyright (c) 2010 Thomas Heller
+
+    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_PHOENIX_OBJECT_DETAIL_CAST_TARGET_HPP
+#define BOOST_PHOENIX_OBJECT_DETAIL_CAST_TARGET_HPP
+
+namespace boost { namespace phoenix
+{
+    namespace detail
+    {
+        template <typename T>
+        struct target
+        {
+            typedef T type;
+        };
+
+        namespace result_of
+        {
+            template <typename T>
+            struct target
+            {
+                typedef
+                    typename proto::detail::uncvref<
+                        typename proto::result_of::value<T>::type
+                    >::type
+                    target_type;
+                typedef typename target_type::type type;
+            };
+
+            template <typename T>
+            struct target<T const&>
+                : target<T>
+            {};
+
+            template <typename T>
+            struct target<T&>
+                : target<T>
+            {};
+        }
+    }
+}}
+
+#endif