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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.

Declaration

var hashValue: Int { get }