add boost on mac

macx64/include/boost/hana/detail/operators/iterable.hpp

@@ -0,0 +1,40 @@
+/*!
+@file
+Defines operators for Iterables.
+
+@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_DETAIL_OPERATORS_ITERABLE_HPP
+#define BOOST_HANA_DETAIL_OPERATORS_ITERABLE_HPP
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/fwd/at.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN namespace detail {
+    template <typename Derived>
+    struct iterable_operators {
+        template <typename N>
+        constexpr decltype(auto) operator[](N&& n) & {
+            return hana::at(static_cast<Derived&>(*this),
+                            static_cast<N&&>(n));
+        }
+
+        template <typename N>
+        constexpr decltype(auto) operator[](N&& n) const& {
+            return hana::at(static_cast<Derived const&>(*this),
+                            static_cast<N&&>(n));
+        }
+
+        template <typename N>
+        constexpr decltype(auto) operator[](N&& n) && {
+            return hana::at(static_cast<Derived&&>(*this),
+                            static_cast<N&&>(n));
+        }
+    };
+} BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_DETAIL_OPERATORS_ITERABLE_HPP