add boost on mac

macx64/include/boost/spirit/home/support/auxiliary/attr_cast.hpp

@@ -0,0 +1,47 @@
+//  Copyright (c) 2001-2011 Hartmut Kaiser
+//
+//  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)
+
+#if !defined(SPIRIT_SUPPORT_ATTR_CAST_OCT_06_2009_00535PM)
+#define SPIRIT_SUPPORT_ATTR_CAST_OCT_06_2009_00535PM
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/spirit/home/support/common_terminals.hpp>
+#include <boost/spirit/home/support/attributes.hpp>
+#include <boost/utility/enable_if.hpp>
+
+namespace boost { namespace spirit
+{
+    ///////////////////////////////////////////////////////////////////////////
+    // This one is the function that the user can call directly in order 
+    // to create a customized attr_cast component
+    template <typename Expr>
+    typename enable_if<proto::is_expr<Expr>
+      , stateful_tag_type<Expr, tag::attr_cast> >::type
+    attr_cast(Expr const& expr)
+    {
+        return stateful_tag_type<Expr, tag::attr_cast>(expr);
+    }
+
+    template <typename Exposed, typename Expr>
+    typename enable_if<proto::is_expr<Expr>
+      , stateful_tag_type<Expr, tag::attr_cast, Exposed> >::type
+    attr_cast(Expr const& expr)
+    {
+        return stateful_tag_type<Expr, tag::attr_cast, Exposed>(expr);
+    }
+
+    template <typename Exposed, typename Transformed, typename Expr>
+    typename enable_if<proto::is_expr<Expr>
+      , stateful_tag_type<Expr, tag::attr_cast, Exposed, Transformed> >::type
+    attr_cast(Expr const& expr)
+    {
+        return stateful_tag_type<Expr, tag::attr_cast, Exposed, Transformed>(expr);
+    }
+}}
+
+#endif