UUID.swift

//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//

extension UUID {
    init(reference: NSUUID) {
        var bytes: uuid_t = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
        withUnsafeMutablePointer(to: &bytes) {
            $0.withMemoryRebound(to: UInt8.self, capacity: MemoryLayout<uuid_t>.size) {
                reference.getBytes($0)
            }
        }
        self = UUID(uuid: bytes)
    }
    
    fileprivate var reference: NSUUID {
        return withUnsafePointer(to: uuid) {
            $0.withMemoryRebound(to: UInt8.self, capacity: MemoryLayout<uuid_t>.size) {
                return NSUUID(uuidBytes: $0)
            }
        }
    }
}

extension UUID : _ObjectiveCBridgeable {
    @_semantics("convertToObjectiveC")
    public func _bridgeToObjectiveC() -> NSUUID {
        return reference
    }
    
    public static func _forceBridgeFromObjectiveC(_ x: NSUUID, result: inout UUID?) {
        if !_conditionallyBridgeFromObjectiveC(x, result: &result) {
            fatalError("Unable to bridge \(NSUUID.self) to \(self)")
        }
    }
    
    public static func _conditionallyBridgeFromObjectiveC(_ input: NSUUID, result: inout UUID?) -> Bool {
        result = UUID(reference: input)
        return true
    }
    
    public static func _unconditionallyBridgeFromObjectiveC(_ source: NSUUID?) -> UUID {
        var result: UUID? = nil
        _forceBridgeFromObjectiveC(source!, result: &result)
        return result!
    }
}

extension NSUUID : _HasCustomAnyHashableRepresentation {
    // Must be @nonobjc to avoid infinite recursion during bridging.
    @nonobjc
    public func _toCustomAnyHashable() -> AnyHashable? {
        return AnyHashable(UUID._unconditionallyBridgeFromObjectiveC(self))
    }
}