A file system event.
SDKs
- iOS 8.0+
- macOS 10.10+
- tvOS 9.0+
- watchOS 2.0+
- Xcode 8.0+
Framework
- Dispatch
StructureDispatch
Dispatch
Topics
Initializers
init()Creates an empty option set.
init<S>(S)Creates a new set from a finite sequence of items.
init(arrayCreates a set containing the elements of the given array literal.
Instance Properties
var isA Boolean value that indicates whether the set has no elements.
Type Properties
Instance Methods
func contains(DispatchReturns a Boolean value that indicates whether a given element is a member of the option set.
func formRemoves all elements of this option set that are not also present in the given set.
func formReplaces this set with a new set containing all elements contained in either this set or the given set, but not in both.
func formInserts the elements of another set into this option set.
func insert(DispatchAdds the given element to the option set if it is not already a member.
func intersection(DispatchReturns a new option set with only the elements contained in both this set and the given set.
func isReturns a Boolean value that indicates whether the set has no members in common with the given set.
func isReturns a Boolean value that indicates whether this set is a strict subset of the given set.
func isReturns a Boolean value that indicates whether this set is a strict superset of the given set.
func isReturns a Boolean value that indicates whether the set is a subset of another set.
func isReturns a Boolean value that indicates whether the set is a superset of the given set.
func remove(DispatchRemoves the given element and all elements subsumed by it.
func subtract(DispatchRemoves the elements of the given set from this set.
func subtracting(DispatchReturns a new set containing the elements of this set that do not occur in the given set.
func symmetricReturns a new option set with the elements contained in this set or in the given set, but not in both.
func union(DispatchReturns a new option set of the elements contained in this set, in the given set, or in both.
func update(with: DispatchInserts the given element into the set.
Operator Functions
static func != (DispatchReturns a Boolean value indicating whether two values are not equal.
Relationships
Conforms To
See Also
Managing Dispatch Sources
class DispatchDispatch provides an interface for monitoring low-level system objects such as Mach ports, Unix descriptors, Unix signals, and VFS nodes for activity and submitting event handlers to dispatch queues for asynchronous processing when such activity occurs.
protocol DispatchDefines a common set of properties and methods that are shared with all dispatch source types.
protocol DispatchA dispatch source that monitors a file descriptor for events defined by Dispatch. The handle is a file descriptor (Int32).
protocol DispatchA dispatch source that monitors a Mach port for dead name notifications, indicating that a send right no longer has any corresponding receive right. The handle is a Mach port with a send or send-once right (mach_port_t).
struct DispatchA Mach port send event.
protocol DispatchA dispatch source that monitors a Mach port for pending messages. The handle is a Mach port with a receive right (mach_port_t).
protocol DispatchA dispatch source that monitors the system for changes in memory pressure condition.
struct DispatchA memory pressure event.
protocol DispatchA dispatch source that monitors an external process for events defined by Dispatch. The handle is a process identifier (pid).
struct DispatchA process event.
protocol DispatchA dispatch source that submits the event handler block based on a timer.
protocol DispatchA dispatch source that coalesces data obtained via calls to calls to the add(data:) method.
protocol DispatchA dispatch source that coalesces data obtained via calls to the or(data:) method.
Dispatch Source Mach Send Event Flags
Mach send event flags.
Dispatch Source Process Event Flags
Process event flags.
Dispatch Source Vnode Event Flags
File-system object event flags.
Dispatch Source Memory Pressure Event Flags
Memory pressure event flags
protocol DispatchA dispatch source that monitors the current process for Unix signals.