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

• encryption_algorithm : mongocxx::v_noabi::options::encrypt
• encryption_query_type : mongocxx::v_noabi::options::encrypt
• level : mongocxx::v_noabi::read_concern, mongocxx::v_noabi::write_concern
• read_mode : mongocxx::v_noabi::read_preference
• validation_action : mongocxx::v_noabi::validation_criteria
• validation_level : mongocxx::v_noabi::validation_criteria
• version : mongocxx::v_noabi::options::server_api