add boost on mac

macx64/include/boost/hana/core/default.hpp

@@ -0,0 +1,32 @@
+/*!
+@file
+Defines `boost::hana::default_` and `boost::hana::is_default`.
+
+@copyright Louis Dionne 2013-2017
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+ */
+
+#ifndef BOOST_HANA_CORE_DEFAULT_HPP
+#define BOOST_HANA_CORE_DEFAULT_HPP
+
+#include <boost/hana/fwd/core/default.hpp>
+
+#include <boost/hana/config.hpp>
+
+#include <type_traits>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    template <typename Method, typename>
+    struct is_default : std::false_type { };
+
+    template <typename Method>
+    struct is_default<Method, decltype((void)
+        static_cast<default_>(*(Method*)0)
+    )>
+        : std::true_type
+    { };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_CORE_DEFAULT_HPP