add boost on mac

macx64/include/boost/metaparse/v1/transform_error.hpp

@@ -0,0 +1,40 @@
+#ifndef BOOST_METAPARSE_V1_TRANSFORM_ERROR_HPP
+#define BOOST_METAPARSE_V1_TRANSFORM_ERROR_HPP
+
+//    Copyright Abel Sinkovics (abel@sinkovics.hu) 2015.
+// 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)
+
+#include <boost/metaparse/v1/is_error.hpp>
+
+#include <boost/mpl/eval_if.hpp>
+
+namespace boost
+{
+  namespace metaparse
+  {
+    namespace v1
+    {
+      template <class P, class F>
+      struct transform_error
+      {
+        template <class S, class Pos>
+        struct apply :
+          boost::mpl::eval_if<
+            typename is_error<typename P::template apply<S, Pos> >::type,
+            typename F::template apply<
+              typename P::template apply<S, Pos>::type
+            >,
+            typename P::template apply<S, Pos>
+          >
+        {};
+        
+        typedef transform_error type;
+      };
+    }
+  }
+}
+
+#endif
+