add boost on mac

macx64/include/boost/poly_collection/detail/is_equality_comparable.hpp

@@ -0,0 +1,37 @@
+/* Copyright 2017-2018 Joaquin M Lopez Munoz.
+ * 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)
+ *
+ * See http://www.boost.org/libs/poly_collection for library home page.
+ */
+
+#ifndef BOOST_POLY_COLLECTION_DETAIL_IS_EQUALITY_COMPARABLE_HPP
+#define BOOST_POLY_COLLECTION_DETAIL_IS_EQUALITY_COMPARABLE_HPP
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/type_traits/has_equal_to.hpp>
+#include <type_traits>
+
+namespace boost{
+
+namespace poly_collection{
+
+namespace detail{
+
+template<typename T>
+using is_equality_comparable=std::integral_constant<
+  bool,
+  has_equal_to<T,T,bool>::value
+>;
+
+} /* namespace poly_collection::detail */
+
+} /* namespace poly_collection */
+
+} /* namespace boost */
+
+#endif