add boost on mac

macx64/include/boost/detail/has_default_constructor.hpp

@@ -0,0 +1,29 @@
+
+//  (C) Copyright Matthias Troyerk 2006.
+//  Use, modification and distribution are subject to 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/type_traits for most recent version including documentation.
+
+#ifndef BOOST_DETAIL_HAS_DEFAULT_CONSTRUCTOR_HPP_INCLUDED
+#define BOOST_DETAIL_HAS_DEFAULT_CONSTRUCTOR_HPP_INCLUDED
+
+#include <boost/type_traits/has_trivial_constructor.hpp>
+
+namespace boost { namespace detail {
+
+/// type trait to check for a default constructor
+///
+/// The default implementation just checks for a trivial constructor.
+/// Using some compiler magic it might be possible to provide a better default
+
+template <class T>
+struct has_default_constructor
+ : public has_trivial_constructor<T>
+{};
+
+} } // namespace boost::detail
+
+
+#endif // BOOST_DETAIL_HAS_DEFAULT_CONSTRUCTOR_HPP_INCLUDED