add boost on mac

macx64/include/boost/safe_numerics/safe_common.hpp

@@ -0,0 +1,44 @@
+#ifndef BOOST_NUMERIC_SAFE_COMMON_HPP
+#define BOOST_NUMERIC_SAFE_COMMON_HPP
+
+//  Copyright (c) 2012 Robert Ramey
+//
+// 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 <type_traits>
+
+namespace boost {
+namespace safe_numerics {
+
+// default implementations for required meta-functions
+template<typename T>
+struct is_safe : public std::false_type
+{};
+
+template<typename T>
+struct base_type {
+    using type = T;
+};
+
+template<class T>
+constexpr const typename base_type<T>::type & base_value(const T & t) {
+    return static_cast<const typename base_type<T>::type & >(t);
+}
+
+template<typename T>
+struct get_promotion_policy {
+    using type = void;
+};
+
+template<typename T>
+struct get_exception_policy {
+    using type = void;
+};
+
+
+} // safe_numerics
+} // boost
+
+#endif // BOOST_NUMERIC_SAFE_COMMON_HPP