Trait CopyingHelper

pub unsafe trait CopyingHelper: Message {
    type Result: Message;
}

Available on crate feature NSObject only.

A helper type for implementing NSCopying.

NSCopying and NSMutableCopying do not in their signatures describe the result type from the copying operation. This is problematic, as it means that using them ends up falling back to AnyObject, which makes copying much less useful and ergonomic.

To properly describe this, we need an associated type which describes the actual result type from a copy. The associated type can’t be present directly on the protocol traits themselves, however, since we want to use them as e.g. ProtocolObject<dyn NSCopying>, so we introduce this helper trait instead. See MutableCopyingHelper for the mutable variant.

We might be able to get rid of this hack once associated type defaults are stabilized.

Safety

The Result type must be correct.

Required Associated Types

type Result: Message

The immutable counterpart of the type, or Self if the type has no immutable counterpart.

The implementation for NSString has itself (NSString) here, while NSMutableString instead has NSString.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<P: ?Sized> CopyingHelper for ProtocolObject<P>

type Result = ProtocolObject<P>

Implementors

impl CopyingHelper for NSAffineTransform

Available on crate feature NSAffineTransform only.

type Result = NSAffineTransform

impl CopyingHelper for NSAppleEventDescriptor

Available on crate feature NSAppleEventDescriptor only.

type Result = NSAppleEventDescriptor

impl CopyingHelper for NSAppleScript

Available on crate feature NSAppleScript only.

type Result = NSAppleScript

impl CopyingHelper for NSAttributedString

Available on crate feature NSAttributedString only.

type Result = NSAttributedString

impl CopyingHelper for NSAttributedStringMarkdownParsingOptions

Available on crate feature NSAttributedString only.

type Result = NSAttributedStringMarkdownParsingOptions

impl CopyingHelper for NSAttributedStringMarkdownSourcePosition

Available on crate feature NSAttributedString only.

type Result = NSAttributedStringMarkdownSourcePosition

impl CopyingHelper for NSByteCountFormatter

Available on crate features NSFormatter and NSByteCountFormatter only.

type Result = NSByteCountFormatter

impl CopyingHelper for NSCachedURLResponse

Available on crate feature NSURLCache only.

type Result = NSCachedURLResponse

impl CopyingHelper for NSCalendar

Available on crate feature NSCalendar only.

type Result = NSCalendar

impl CopyingHelper for NSCalendarDate

Available on crate features NSDate and NSCalendarDate only.

type Result = NSCalendarDate

impl CopyingHelper for NSCharacterSet

Available on crate feature NSCharacterSet only.

type Result = NSCharacterSet

impl CopyingHelper for NSComparisonPredicate

Available on crate features NSPredicate and NSComparisonPredicate only.

type Result = NSComparisonPredicate

impl CopyingHelper for NSCompoundPredicate

Available on crate features NSPredicate and NSCompoundPredicate only.

type Result = NSCompoundPredicate

impl CopyingHelper for NSData

Available on crate feature NSData only.

type Result = NSData

impl CopyingHelper for NSDataDetector

Available on crate feature NSRegularExpression only.

type Result = NSDataDetector

impl CopyingHelper for NSDate

Available on crate feature NSDate only.

type Result = NSDate

impl CopyingHelper for NSDateComponents

Available on crate feature NSCalendar only.

type Result = NSDateComponents

impl CopyingHelper for NSDateComponentsFormatter

Available on crate features NSFormatter and NSDateComponentsFormatter only.

type Result = NSDateComponentsFormatter

impl CopyingHelper for NSDateFormatter

Available on crate features NSFormatter and NSDateFormatter only.

type Result = NSDateFormatter

impl CopyingHelper for NSDateInterval

Available on crate feature NSDateInterval only.

type Result = NSDateInterval

impl CopyingHelper for NSDateIntervalFormatter

Available on crate features NSFormatter and NSDateIntervalFormatter only.

type Result = NSDateIntervalFormatter

impl CopyingHelper for NSDecimalNumber

Available on crate features NSValue and NSDecimalNumber only.

type Result = NSDecimalNumber

impl CopyingHelper for NSDimension

Available on crate feature NSUnit only.

type Result = NSDimension

impl CopyingHelper for NSEnergyFormatter

Available on crate features NSFormatter and NSEnergyFormatter only.

type Result = NSEnergyFormatter

impl CopyingHelper for NSError

Available on crate feature NSError only.

type Result = NSError

impl CopyingHelper for NSException

Available on crate feature NSException only.

type Result = NSException

impl CopyingHelper for NSExpression

Available on crate feature NSExpression only.

type Result = NSExpression

impl CopyingHelper for NSExtensionItem

Available on crate feature NSExtensionItem only.

type Result = NSExtensionItem

impl CopyingHelper for NSFileSecurity

Available on crate feature NSURL only.

type Result = NSFileSecurity

impl CopyingHelper for NSFormatter

Available on crate feature NSFormatter only.

type Result = NSFormatter

impl CopyingHelper for NSHTTPURLResponse

Available on crate feature NSURLResponse only.

type Result = NSHTTPURLResponse

impl CopyingHelper for NSISO8601DateFormatter

Available on crate features NSFormatter and NSISO8601DateFormatter only.

type Result = NSISO8601DateFormatter

impl CopyingHelper for NSIndexPath

Available on crate feature NSIndexPath only.

type Result = NSIndexPath

impl CopyingHelper for NSIndexSet

Available on crate feature NSIndexSet only.

type Result = NSIndexSet

impl CopyingHelper for NSInflectionRule

Available on crate feature NSInflectionRule only.

type Result = NSInflectionRule

impl CopyingHelper for NSInflectionRuleExplicit

Available on crate feature NSInflectionRule only.

type Result = NSInflectionRuleExplicit

impl CopyingHelper for NSItemProvider

Available on crate feature NSItemProvider only.

type Result = NSItemProvider

impl CopyingHelper for NSLengthFormatter

Available on crate features NSFormatter and NSLengthFormatter only.

type Result = NSLengthFormatter

impl CopyingHelper for NSListFormatter

Available on crate features NSFormatter and NSListFormatter only.

type Result = NSListFormatter

impl CopyingHelper for NSLocale

Available on crate feature NSLocale only.

type Result = NSLocale

impl CopyingHelper for NSLocalizedNumberFormatRule

Available on crate feature NSLocalizedNumberFormatRule only.

type Result = NSLocalizedNumberFormatRule

impl CopyingHelper for NSMachPort

Available on crate feature NSPort only.

type Result = NSMachPort

impl CopyingHelper for NSMassFormatter

Available on crate features NSFormatter and NSMassFormatter only.

type Result = NSMassFormatter

impl CopyingHelper for NSMeasurementFormatter

Available on crate features NSFormatter and NSMeasurementFormatter only.

type Result = NSMeasurementFormatter

impl CopyingHelper for NSMessagePort

Available on crate feature NSPort only.

type Result = NSMessagePort

impl CopyingHelper for NSMorphology

Available on crate feature NSMorphology only.

type Result = NSMorphology

impl CopyingHelper for NSMorphologyCustomPronoun

Available on crate feature NSMorphology only.

type Result = NSMorphologyCustomPronoun

impl CopyingHelper for NSMorphologyPronoun

Available on crate feature NSMorphology only.

type Result = NSMorphologyPronoun

impl CopyingHelper for NSMutableAttributedString

Available on crate feature NSAttributedString only.

type Result = NSAttributedString

impl CopyingHelper for NSMutableCharacterSet

Available on crate feature NSCharacterSet only.

type Result = NSCharacterSet

impl CopyingHelper for NSMutableData

Available on crate feature NSData only.

type Result = NSData

impl CopyingHelper for NSMutableIndexSet

Available on crate feature NSIndexSet only.

type Result = NSIndexSet

impl CopyingHelper for NSMutableString

Available on crate feature NSString only.

type Result = NSString

impl CopyingHelper for NSMutableURLRequest

Available on crate feature NSURLRequest only.

type Result = NSURLRequest

impl CopyingHelper for NSNotification

Available on crate feature NSNotification only.

type Result = NSNotification

impl CopyingHelper for NSNull

Available on crate feature NSNull only.

type Result = NSNull

impl CopyingHelper for NSNumber

Available on crate feature NSValue only.

type Result = NSNumber

impl CopyingHelper for NSNumberFormatter

Available on crate features NSFormatter and NSNumberFormatter only.

type Result = NSNumberFormatter

impl CopyingHelper for NSOrthography

Available on crate feature NSOrthography only.

type Result = NSOrthography

impl CopyingHelper for NSPersonNameComponents

Available on crate feature NSPersonNameComponents only.

type Result = NSPersonNameComponents

impl CopyingHelper for NSPersonNameComponentsFormatter

Available on crate features NSFormatter and NSPersonNameComponentsFormatter only.

type Result = NSPersonNameComponentsFormatter

impl CopyingHelper for NSPointerArray

Available on crate feature NSPointerArray only.

type Result = NSPointerArray

impl CopyingHelper for NSPointerFunctions

Available on crate feature NSPointerFunctions only.

type Result = NSPointerFunctions

impl CopyingHelper for NSPort

Available on crate feature NSPort only.

type Result = NSPort

impl CopyingHelper for NSPredicate

Available on crate feature NSPredicate only.

type Result = NSPredicate

impl CopyingHelper for NSPresentationIntent

Available on crate feature NSAttributedString only.

type Result = NSPresentationIntent

impl CopyingHelper for NSRegularExpression

Available on crate feature NSRegularExpression only.

type Result = NSRegularExpression

impl CopyingHelper for NSRelativeDateTimeFormatter

Available on crate features NSFormatter and NSRelativeDateTimeFormatter only.

type Result = NSRelativeDateTimeFormatter

impl CopyingHelper for NSScanner

Available on crate feature NSScanner only.

type Result = NSScanner

impl CopyingHelper for NSSocketPort

Available on crate feature NSPort only.

type Result = NSSocketPort

impl CopyingHelper for NSSortDescriptor

Available on crate feature NSSortDescriptor only.

type Result = NSSortDescriptor

impl CopyingHelper for NSString

Available on crate feature NSString only.

type Result = NSString

impl CopyingHelper for NSTermOfAddress

Available on crate feature NSTermOfAddress only.

type Result = NSTermOfAddress

impl CopyingHelper for NSTextCheckingResult

Available on crate feature NSTextCheckingResult only.

type Result = NSTextCheckingResult

impl CopyingHelper for NSTimeZone

Available on crate feature NSTimeZone only.

type Result = NSTimeZone

impl CopyingHelper for NSURL

Available on crate feature NSURL only.

type Result = NSURL

impl CopyingHelper for NSURLComponents

Available on crate feature NSURL only.

type Result = NSURLComponents

impl CopyingHelper for NSURLCredential

Available on crate feature NSURLCredential only.

type Result = NSURLCredential

impl CopyingHelper for NSURLProtectionSpace

Available on crate feature NSURLProtectionSpace only.

type Result = NSURLProtectionSpace

impl CopyingHelper for NSURLQueryItem

Available on crate feature NSURL only.

type Result = NSURLQueryItem

impl CopyingHelper for NSURLRequest

Available on crate feature NSURLRequest only.

type Result = NSURLRequest

impl CopyingHelper for NSURLResponse

Available on crate feature NSURLResponse only.

type Result = NSURLResponse

impl CopyingHelper for NSURLSessionConfiguration

Available on crate feature NSURLSession only.

type Result = NSURLSessionConfiguration

impl CopyingHelper for NSURLSessionDataTask

Available on crate feature NSURLSession only.

type Result = NSURLSessionDataTask

impl CopyingHelper for NSURLSessionDownloadTask

Available on crate feature NSURLSession only.

type Result = NSURLSessionDownloadTask

impl CopyingHelper for NSURLSessionStreamTask

Available on crate feature NSURLSession only.

type Result = NSURLSessionStreamTask

impl CopyingHelper for NSURLSessionTask

Available on crate feature NSURLSession only.

type Result = NSURLSessionTask

impl CopyingHelper for NSURLSessionUploadTask

Available on crate feature NSURLSession only.

type Result = NSURLSessionUploadTask

impl CopyingHelper for NSURLSessionWebSocketTask

Available on crate feature NSURLSession only.

type Result = NSURLSessionWebSocketTask

impl CopyingHelper for NSUUID

Available on crate feature NSUUID only.

type Result = NSUUID

impl CopyingHelper for NSUnit

Available on crate feature NSUnit only.

type Result = NSUnit

impl CopyingHelper for NSUnitAcceleration

Available on crate feature NSUnit only.

type Result = NSUnitAcceleration

impl CopyingHelper for NSUnitAngle

Available on crate feature NSUnit only.

type Result = NSUnitAngle

impl CopyingHelper for NSUnitArea

Available on crate feature NSUnit only.

type Result = NSUnitArea

impl CopyingHelper for NSUnitConcentrationMass

Available on crate feature NSUnit only.

type Result = NSUnitConcentrationMass

impl CopyingHelper for NSUnitDispersion

Available on crate feature NSUnit only.

type Result = NSUnitDispersion

impl CopyingHelper for NSUnitDuration

Available on crate feature NSUnit only.

type Result = NSUnitDuration

impl CopyingHelper for NSUnitElectricCharge

Available on crate feature NSUnit only.

type Result = NSUnitElectricCharge

impl CopyingHelper for NSUnitElectricCurrent

Available on crate feature NSUnit only.

type Result = NSUnitElectricCurrent

impl CopyingHelper for NSUnitElectricPotentialDifference

Available on crate feature NSUnit only.

type Result = NSUnitElectricPotentialDifference

impl CopyingHelper for NSUnitElectricResistance

Available on crate feature NSUnit only.

type Result = NSUnitElectricResistance

impl CopyingHelper for NSUnitEnergy

Available on crate feature NSUnit only.

type Result = NSUnitEnergy

impl CopyingHelper for NSUnitFrequency

Available on crate feature NSUnit only.

type Result = NSUnitFrequency

impl CopyingHelper for NSUnitFuelEfficiency

Available on crate feature NSUnit only.

type Result = NSUnitFuelEfficiency

impl CopyingHelper for NSUnitIlluminance

Available on crate feature NSUnit only.

type Result = NSUnitIlluminance

impl CopyingHelper for NSUnitInformationStorage

Available on crate feature NSUnit only.

type Result = NSUnitInformationStorage

impl CopyingHelper for NSUnitLength

Available on crate feature NSUnit only.

type Result = NSUnitLength

impl CopyingHelper for NSUnitMass

Available on crate feature NSUnit only.

type Result = NSUnitMass

impl CopyingHelper for NSUnitPower

Available on crate feature NSUnit only.

type Result = NSUnitPower

impl CopyingHelper for NSUnitPressure

Available on crate feature NSUnit only.

type Result = NSUnitPressure

impl CopyingHelper for NSUnitSpeed

Available on crate feature NSUnit only.

type Result = NSUnitSpeed

impl CopyingHelper for NSUnitTemperature

Available on crate feature NSUnit only.

type Result = NSUnitTemperature

impl CopyingHelper for NSUnitVolume

Available on crate feature NSUnit only.

type Result = NSUnitVolume

impl CopyingHelper for NSUserNotification

Available on crate feature NSUserNotification only.

type Result = NSUserNotification

impl CopyingHelper for NSUserNotificationAction

Available on crate feature NSUserNotification only.

type Result = NSUserNotificationAction

impl CopyingHelper for NSValue

Available on crate feature NSValue only.

type Result = NSValue

impl CopyingHelper for NSXMLDTD

Available on crate features NSXMLNode and NSXMLDTD only.

type Result = NSXMLDTD

impl CopyingHelper for NSXMLDTDNode

Available on crate features NSXMLNode and NSXMLDTDNode only.

type Result = NSXMLDTDNode

impl CopyingHelper for NSXMLDocument

Available on crate features NSXMLNode and NSXMLDocument only.

type Result = NSXMLDocument

impl CopyingHelper for NSXMLElement

Available on crate features NSXMLNode and NSXMLElement only.

type Result = NSXMLElement

impl CopyingHelper for NSXMLNode

Available on crate feature NSXMLNode only.

type Result = NSXMLNode

impl<KeyType: ?Sized + Message, ObjectType: ?Sized + Message> CopyingHelper for NSDictionary<KeyType, ObjectType>

Available on crate feature NSDictionary only.

type Result = NSDictionary<KeyType, ObjectType>

impl<KeyType: ?Sized + Message, ObjectType: ?Sized + Message> CopyingHelper for NSMapTable<KeyType, ObjectType>

Available on crate feature NSMapTable only.

type Result = NSMapTable<KeyType, ObjectType>

impl<KeyType: ?Sized + Message, ObjectType: ?Sized + Message> CopyingHelper for NSMutableDictionary<KeyType, ObjectType>

Available on crate feature NSDictionary only.

type Result = NSDictionary<KeyType, ObjectType>

impl<ObjectType: ?Sized + Message> CopyingHelper for NSArray<ObjectType>

Available on crate feature NSArray only.

type Result = NSArray<ObjectType>

impl<ObjectType: ?Sized + Message> CopyingHelper for NSHashTable<ObjectType>

Available on crate feature NSHashTable only.

type Result = NSHashTable<ObjectType>

impl<ObjectType: ?Sized + Message> CopyingHelper for NSMutableArray<ObjectType>

Available on crate feature NSArray only.

type Result = NSArray<ObjectType>

impl<ObjectType: ?Sized + Message> CopyingHelper for NSMutableOrderedSet<ObjectType>

Available on crate feature NSOrderedSet only.

type Result = NSOrderedSet<ObjectType>

impl<ObjectType: ?Sized + Message> CopyingHelper for NSMutableSet<ObjectType>

Available on crate feature NSSet only.

type Result = NSSet<ObjectType>

impl<ObjectType: ?Sized + Message> CopyingHelper for NSOrderedSet<ObjectType>

Available on crate feature NSOrderedSet only.

type Result = NSOrderedSet<ObjectType>

impl<ObjectType: ?Sized + Message> CopyingHelper for NSSet<ObjectType>

Available on crate feature NSSet only.

type Result = NSSet<ObjectType>

impl<UnitType: ?Sized + Message> CopyingHelper for NSMeasurement<UnitType>

Available on crate feature NSMeasurement only.

type Result = NSMeasurement<UnitType>