Member so_5::extra::mboxes::unique_subscribers::errors::rc_delivery_filters_not_supported: Since v.1.5.1 delivery filters are supported by unique_subscribers mbox.
Member so_5::extra::mboxes::unique_subscribers::errors::rc_subscription_exists: Since v.1.6.0 there is no such error code.
Member so_5::extra::mboxes::unique_subscribers::make_mbox (so_5::environment_t &env): Since v.1.6.0 it's just a synonum for so_5::make_unique_subscribers_mbox(). This function is kept here for compatibility reasons. It will be removed in some future release of so5extra.