func _add<Reducer>(observation: ValueObservation<Reducer>, scheduling scheduler: some ValueObservationScheduler, onChange: @escaping (Reducer.Value) -> Void) -> AnyDatabaseCancellable where Reducer : ValueReducer s4GRDB16DatabaseSnapshotC4_add11observation10scheduling8onChangeAA03AnyB11CancellableCAA16ValueObservationVyxG_q_y0K0QzYbctAA0K7ReducerRzAA0kL9SchedulerR_r0_lF What are these?68ZO9import GRDBA toolkit for SQLite databases, with a focus on application development
final class DatabaseSnapshotA database connection that serializes accesses to an unchanging database content, as it existed at the moment the snapshot was created.
struct ValueObservation<Reducer> where Reducer : ValueReducerValueObservation tracks changes in the results of database requests, and notifies fresh values whenever the database changes.
protocol ValueObservationScheduler : SendableA type that determines when ValueObservation notifies its fresh values.
associatedtype Value : SendableThe type of observed values
typealias Void = ()The return type of functions that don’t explicitly specify a return type, that is, an empty tuple ().
final class AnyDatabaseCancellableA type-erasing cancellable object that executes a provided closure when canceled.
protocol ValueReducer : _ValueReducerValueReducer supports ValueObservation.
var configuration: Configuration { get }var path: String { get }The path to the database file.
func asyncRead(_ value: @escaping (Result<Database, Error>) -> Void) func asyncUnsafeRead(_ value: @escaping (Result<Database, Error>) -> Void) func close() throws func interrupt() func read<T>(_ block: (Database) throws -> T) rethrows -> T func read<T>(_ value: @escaping (Database) throws -> T) async throws -> T where T : Sendable func unsafeRead<T>(_ value: (Database) throws -> T) rethrows -> T func unsafeRead<T>(_ value: @escaping (Database) throws -> T) async throws -> T where T : Sendable func unsafeReentrantRead<T>(_ value: (Database) throws -> T) throws -> T