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Creates an instance that uniquely identifies the given metatype.

Parameter: A metatype.

Declaration

init(_ x: Any.Type)

Creates an instance that uniquely identifies the given class instance.

The following example creates an example class A and compares instances of the class using their object identifiers and the identical-to operator (===):

class IntegerRef {
    let value: Int
    init(_ value: Int) {
        self.value = value
    }
}

let x = IntegerRef(10)
let y = x

print(ObjectIdentifier(x) == ObjectIdentifier(y))
// Prints "true"
print(x === y)
// Prints "true"

let z = IntegerRef(10)
print(ObjectIdentifier(x) == ObjectIdentifier(z))
// Prints "false"
print(x === z)
// Prints "false"

x: An instance of a class.

Declaration

init(_ x: AnyObject)

A textual representation of the identifier, suitable for debugging.

Declaration

var debugDescription: String { get }

The identifier's hash value.

The hash value is not guaranteed to be stable across different invocations of the same program. Do not persist the hash value across program runs.

See Also: Hashable

Declaration

var hashValue: Int { get }

Returns a Boolean value indicating whether the value of the first argument is less than that of the second argument.

This function is the only requirement of the Comparable protocol. The remainder of the relational operator functions are implemented by the standard library for any type that conforms to Comparable.

Parameters: lhs: A value to compare. rhs: Another value to compare.

Declaration

func <(lhs: ObjectIdentifier, rhs: ObjectIdentifier) -> Bool

Returns a Boolean value indicating whether two values are equal.

Equality is the inverse of inequality. For any values a and b, a == b implies that a != b is false.

Parameters: lhs: A value to compare. rhs: Another value to compare.

Declaration

func ==(x: ObjectIdentifier, y: ObjectIdentifier) -> Bool