Type Definition melib::backends::notmuch::bindings::notmuch_database_needs_upgrade

type notmuch_database_needs_upgrade = unsafe extern "C" fn(database: *mut notmuch_database_t) -> notmuch_bool_t;

Can the database be upgraded to a newer database version?

If this function returns TRUE, then the caller may call notmuch_database_upgrade to upgrade the database. If the caller does not upgrade an out-of-date database, then some functions may fail with NOTMUCH_STATUS_UPGRADE_REQUIRED. This always returns FALSE for a read-only database because there's no way to upgrade a read-only database.