EnumerationSwift5.9.0
Never
The return type of functions that do not return normally, that is, a type with no values.
@frozen enum NeverUse Never as the return type when declaring a closure, function, or method that unconditionally throws an error, traps, or otherwise does not terminate.
func crashAndBurn() -> Never {
fatalError("Something very, very bad happened")
}Citizens in Swift
Conformances
protocol ComparableA type that can be compared using the relational operators
<,<=,>=, and>.protocol DecodableA type that can decode itself from an external representation.
protocol EncodableA type that can encode itself to an external representation.
protocol EquatableA type that can be compared for value equality.
protocol ErrorA type representing an error value that can be thrown.
protocol HashableA type that can be hashed into a
Hasherto produce an integer hash value.protocol IdentifiableA class of types whose instances hold the value of an entity with stable identity.
protocol SendableA type whose values can safely be passed across concurrency domains by copying.
Members
Features
static func != (Self, Self) -> Bool static func ... (Self) -> PartialRangeFrom<Self> Returns a partial range extending upward from a lower bound.
static func ... (Self) -> PartialRangeThrough<Self> Returns a partial range up to, and including, its upper bound.
static func ... (Self, Self) -> ClosedRange<Self> Returns a closed range that contains both of its bounds.
static func ..< (Self) -> PartialRangeUpTo<Self> Returns a partial range up to, but not including, its upper bound.
static func ..< (Self, Self) -> Range<Self> Returns a half-open range that contains its lower bound but not its upper bound.