add boost on mac

macx64/include/boost/metaparse/v1/util/is_digit.hpp

@@ -0,0 +1,38 @@
+#ifndef BOOST_METAPARSE_V1_UTIL_IS_DIGIT_HPP
+#define BOOST_METAPARSE_V1_UTIL_IS_DIGIT_HPP
+
+// Copyright Abel Sinkovics (abel@sinkovics.hu)  2009 - 2010.
+// 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/util/in_range_c.hpp>
+
+#include <boost/mpl/vector.hpp>
+
+namespace boost
+{
+  namespace metaparse
+  {
+    namespace v1
+    {
+      namespace util
+      {
+        template <class C = boost::mpl::na>
+        struct is_digit : in_range_c<char, '0', '9'>::apply<C> {};
+
+        template <>
+        struct is_digit<boost::mpl::na>
+        {
+          typedef is_digit type;
+
+          template <class C = boost::mpl::na>
+          struct apply : is_digit<C> {};
+        };
+      }
+    }
+  }
+}
+
+#endif
+