add boost on mac

macx64/include/boost/metaparse/v1/impl/assert_string_length.hpp

@@ -0,0 +1,31 @@
+#ifndef BOOST_METAPARSE_V1_IMPL_ASSERT_STRING_LENGTH_HPP
+#define BOOST_METAPARSE_V1_IMPL_ASSERT_STRING_LENGTH_HPP
+
+// Copyright Abel Sinkovics (abel@sinkovics.hu)  2014.
+// 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/static_assert.hpp>
+
+namespace boost
+{
+  namespace metaparse
+  {
+    namespace v1
+    {
+      namespace impl
+      {
+        template <int Len, class S>
+        struct assert_string_length : S
+        {
+          BOOST_STATIC_ASSERT((Len <= BOOST_METAPARSE_LIMIT_STRING_SIZE));
+        };
+      }
+    }
+  }
+}
+
+#endif
+
+