CPNull Class Reference

An object representation of nil. More...

#import <CPNull.h>

Inheritance diagram for CPNull:

Instance Methods
(void)	- encodeWithCoder:
(id)	- initWithCoder:
(BOOL)	- isEqual:
(id)	- valueForKey:
Instance Methods inherited from CPObject
(void)	- addObserver:forKeyPath:options:context:
(void)	- applyChange:toKeyPath:
(id)	- autorelease
(id)	- awakeAfterUsingCoder:
(void)	- awakeFromCib
(void)	- bind:toObject:withKeyPath:options:
(Class)	- classForCoder
(Class)	- classForKeyedArchiver
(CPString)	- className
(id)	- copy
(void)	- dealloc
(CPString)	- description
(CPDictionary)	- dictionaryWithValuesForKeys:
(void)	- didChange:valuesAtIndexes:forKey:
(void)	- didChangeValueForKey:
(void)	- didChangeValueForKey:withSetMutation:usingObjects:
(void)	- doesNotRecognizeSelector:
(CPArray)	- exposedBindings
(id)	- forwardingTargetForSelector:
(void)	- forwardInvocation:
(unsigned)	- hash
(BOOL)	- implementsSelector:
(CPDictionary)	- infoForBinding:
(id)	- init
(BOOL)	- isKindOfClass:
(BOOL)	- isMemberOfClass:
(BOOL)	- isProxy
(IMP)	- methodForSelector:
(CPMethodSignature)	- methodSignatureForSelector:
(id)	- mutableArrayValueForKey:
(id)	- mutableArrayValueForKeyPath:
(id)	- mutableCopy
(id)	- mutableSetValueForKey:
(id)	- mutableSetValueForKeyPath:
(id)	- performSelector:
(id)	- performSelector:withObject:
(void)	- performSelector:withObject:afterDelay:
(void)	- performSelector:withObject:afterDelay:inModes:
(id)	- performSelector:withObject:withObject:
(id)	- performSelector:withObjects:
(void)	- release
(void)	- removeObserver:forKeyPath:
(id)	- replacementObjectForArchiver:
(id)	- replacementObjectForCoder:
(id)	- replacementObjectForKeyedArchiver:
(BOOL)	- respondsToSelector:
(id)	- retain
(id)	- self
(void)	- setValue:forKey:
(void)	- setValue:forKeyPath:
(void)	- setValue:forUndefinedKey:
(void)	- setValuesForKeysWithDictionary:
(CPString)	- UID
(void)	- unbind:
(Class)	- valueClassForBinding:
(id)	- valueForKeyPath:
(id)	- valueForUndefinedKey:
(void)	- willChange:valuesAtIndexes:forKey:
(void)	- willChangeValueForKey:
(void)	- willChangeValueForKey:withSetMutation:usingObjects:

Class Methods
(CPNull)	+ null
Class Methods inherited from CPObject
(BOOL)	+ accessInstanceVariablesDirectly
(id)	+ alloc
(id)	+ allocWithCoder:
(BOOL)	+ automaticallyNotifiesObserversForKey:
(void)	+ cancelPreviousPerformRequestsWithTarget:
(void)	+ cancelPreviousPerformRequestsWithTarget:selector:object:
(Class)	+ class
(BOOL)	+ conformsToProtocol:
(void)	+ exposeBinding:
(void)	+ initialize
(IMP)	+ instanceMethodForSelector:
(BOOL)	+ instancesImplementSelector:
(BOOL)	+ instancesRespondToSelector:
(BOOL)	+ isBindingExclusive:
(BOOL)	+ isSubclassOfClass:
(CPSet)	+ keyPathsForValuesAffectingValueForKey:
(void)	+ load
(id)	+ new
(void)	+ object:performSelector:withObject:afterDelay:inModes:
(void)	+ setVersion:
(Class)	+ superclass
(int)	+ version

Detailed Description

An object representation of nil.

This class is used as an object representation of nil. This is handy when a collection only accepts objects as values, but you would like a nil representation in there.

Definition at line 2 of file CPNull.h.

Method Documentation

encodeWithCoder:()

- (void) encodeWithCoder: (CPCoder)  aCoder

implementation

Writes out nothing to the specified coder.

Parameters

aCoder

the coder to which nothing will be written

Definition at line 82 of file CPNull.j.

initWithCoder:()

- (id) initWithCoder: (CPCoder)  aCoder

implementation

Returns CPNull null.

Parameters

aCoder

the coder from which to do nothing

Returns

[CPNull null]

Definition at line 72 of file CPNull.j.

isEqual:()

- (BOOL) isEqual: (id)  anObject

implementation

Determines if anObject is functionally equivalent to the receiver.

Returns

YES if anObject is functionally equivalent to the receiver.

Reimplemented from CPObject.

Definition at line 59 of file CPNull.j.

null()

+ (CPNull) null

implementation

Returns the singleton instance of the CPNull object. While CPNull and nil should be interpreted as the same, they are not equal ('==').

Definition at line 51 of file CPNull.j.

valueForKey:()

- (id) valueForKey: (CPString)  aKey

implementation

Reimplemented from CPObject.

Provided by category CPNull(CPKeyValueCoding).

Definition at line 293 of file CPKeyValueCoding.j.

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The documentation for this class was generated from the following files:

• Foundation/CPNull.h
• Foundation/CPNull.j