[Boost-users] config. how to check if std::shared_ptr & std::scoped_ptr availability?

Hello! I need to check if std::shred_ptr & std::scoped_ptr availability. I read boost.config and found: http://www.boost.org/doc/libs/1_49_0/libs/config/doc/html/boost_config/boost... But in this list don't exist macro that I need. Ideas? Thanks. -- Regards,   niXman