You’re viewing third-party extensions to Optional, an enum from the Swift standard library.
You can also read the documentation forOptional itself.
extension Optional@frozen enum Optional<Wrapped> where Wrapped : ~CopyableA type that represents either a wrapped value or the absence of a value.
import CasePathsCoreCase paths bring the power and ergonomics of key paths to enums.
static var allCasePaths: AllCasePaths { get }@dynamicMemberLookup struct AllCasePathssubscript<Value>(case keyPath: CaseKeyPath<Self, Value>) -> Value? { get } Attempts to extract the associated value from a root enum using a case key path.
subscript<Value>(case keyPath: CaseKeyPath<Self, Value>) -> Value { get set } Replaces the associated value of a root enum at a case key path when the case matches.
subscript(case keyPath: PartialCaseKeyPath<Self>) -> Any? { get } Attempts to extract the associated value from a root enum using a partial case key path.
subscript<Value>(dynamicMember keyPath: KeyPath<Self.AllCasePaths, AnyCasePath<Self, Value>>) -> Value? { get set } Extracts the associated value of a case via dynamic member lookup.
subscript<Value>(dynamicMember keyPath: KeyPath<Self.AllCasePaths, AnyCasePath<Self, Value>>) -> Value { get set } Embeds the associated value of a case via dynamic member lookup.
func `is`(_ keyPath: PartialCaseKeyPath<Self>) -> Bool Tests the associated value of a case.
mutating func modify<Value>(_ keyPath: CaseKeyPath<Self, Value>, yield: (inout Value) -> Void, fileID: StaticString = #fileID, filePath: StaticString = #filePath, line: UInt = #line, column: UInt = #column) Unwraps and yields a mutable associated value to a closure.
typealias Cases = Case<Self>A namespace that can be used to derive case key paths from case-pathable enums.
protocol CasePathableA type that provides a collection of all of its case paths.
func `is`(_ keyPath: PartialCaseKeyPath<Wrapped>) -> Bool protocol CopyableA type whose values can be implicitly or explicitly copied.
protocol Escapableprotocol CasePathIterable : CasePathable where Self.AllCasePaths : Sequence, Self.AllCasePaths.Element == PartialKeyPath<Case<Self>>A type that provides a collection of all of its case paths.