Here is a list of all documented enum values with links to the class documentation for each member:

• kDeferrable : storages::postgres::TransactionOptions
• kError : engine::io::Poller::Event
• kMajority : storages::mongo::options::WriteConcern
• kNearest : storages::mongo::options::ReadPreference
• kNone : engine::io::Poller::Event
• kPrimary : storages::mongo::options::ReadPreference
• kPrimaryPreferred : storages::mongo::options::ReadPreference
• kRead : engine::io::Poller::Event
• kSecondary : storages::mongo::options::ReadPreference
• kSecondaryPreferred : storages::mongo::options::ReadPreference
• kUnacknowledged : storages::mongo::options::WriteConcern
• kWrite : engine::io::Poller::Event