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6.169 UndefinedObject
- Defined in namespace Smalltalk
- Category: Language-Implementation
- I have the questionable distinction of being a class with only one
instance, which is the object "nil".
6.169.1 UndefinedObject: class creation
- metaclassFor: classNameString
- Create a Metaclass object for the given class name. The metaclass is a subclass of Class
- removeSubclass: aClass
- Ignored -- necessary to support disjoint class hierarchies
- subclass: classNameString
- instanceVariableNames: stringInstVarNames
classVariableNames: stringOfClassVarNames
poolDictionaries: stringOfPoolNames
category: categoryNameString
Define a fixed subclass of the receiver with the given name, instance variables, class variables, pool dictionaries and category. If the class is already defined, if necessary, recompile everything needed.
- variableByteSubclass: classNameString
- instanceVariableNames: stringInstVarNames
classVariableNames: stringOfClassVarNames
poolDictionaries: stringOfPoolNames
category: categoryNameString
Define a byte variable subclass of the receiver with the given name, instance variables, class variables, pool dictionaries and category. If the class is already defined, if necessary, recompile everything needed.
- variableSubclass: classNameString
- instanceVariableNames: stringInstVarNames
classVariableNames: stringOfClassVarNames
poolDictionaries: stringOfPoolNames
category: categoryNameString
Define a variable pointer subclass of the receiver with the given name, instance variables, class variables, pool dictionaries and category. If the class is already defined, if necessary, recompile everything needed.
- variableWordSubclass: classNameString
- instanceVariableNames: stringInstVarNames
classVariableNames: stringOfClassVarNames
poolDictionaries: stringOfPoolNames
category: categoryNameString
Define a word variable subclass of the receiver with the given name, instance variables, class variables, pool dictionaries and category. If the class is already defined, if necessary, recompile everything needed.
6.169.2 UndefinedObject: class creation - alternative
- subclass: classNameString classInstanceVariableNames: stringClassInstVarNames instanceVariableNames: stringInstVarNames classVariableNames: stringOfClassVarNames poolDictionaries: stringOfPoolNames
- Don't use this, it is only present to file in from IBM Smalltalk
- subclass: classNameString instanceVariableNames: stringInstVarNames classVariableNames: stringOfClassVarNames poolDictionaries: stringOfPoolNames
- Don't use this, it is only present to file in from IBM Smalltalk
- variableByteSubclass: classNameString classInstanceVariableNames: stringClassInstVarNames instanceVariableNames: stringInstVarNames classVariableNames: stringOfClassVarNames poolDictionaries: stringOfPoolNames
- Don't use this, it is only present to file in from IBM Smalltalk
- variableByteSubclass: classNameString instanceVariableNames: stringInstVarNames classVariableNames: stringOfClassVarNames poolDictionaries: stringOfPoolNames
- Don't use this, it is only present to file in from IBM Smalltalk
- variableSubclass: classNameString classInstanceVariableNames: stringClassInstVarNames instanceVariableNames: stringInstVarNames classVariableNames: stringOfClassVarNames poolDictionaries: stringOfPoolNames
- Don't use this, it is only present to file in from IBM Smalltalk
- variableSubclass: classNameString instanceVariableNames: stringInstVarNames classVariableNames: stringOfClassVarNames poolDictionaries: stringOfPoolNames
- Don't use this, it is only present to file in from IBM Smalltalk
- variableWordSubclass: classNameString classInstanceVariableNames: stringClassInstVarNames instanceVariableNames: stringInstVarNames classVariableNames: stringOfClassVarNames poolDictionaries: stringOfPoolNames
- Don't use this, it is only present to file in from IBM Smalltalk
- variableWordSubclass: classNameString instanceVariableNames: stringInstVarNames classVariableNames: stringOfClassVarNames poolDictionaries: stringOfPoolNames
- Don't use this, it is only present to file in from IBM Smalltalk
6.169.3 UndefinedObject: CObject interoperability
- free
- Do nothing, a NULL pointer can be safely freed.
6.169.4 UndefinedObject: dependents access
- addDependent: ignored
- Refer to the comment in Object|dependents.
- release
- Nil release is a no-op
6.169.5 UndefinedObject: printing
- printOn: aStream
- Print a representation of the receiver on aStream.
6.169.6 UndefinedObject: storing
- storeOn: aStream
- Store Smalltalk code compiling to the receiver on aStream.
6.169.7 UndefinedObject: testing
- ifNil: nilBlock
- Evaluate nilBlock if the receiver is nil, else answer nil
- ifNil: nilBlock ifNotNil: notNilBlock
- Evaluate nilBlock if the receiver is nil, else evaluate notNilBlock, passing the receiver.
- ifNotNil: notNilBlock
- Evaluate notNilBlock if the receiver is not nil, passing the receiver. Else answer nil
- ifNotNil: notNilBlock ifNil: nilBlock
- Evaluate nilBlock if the receiver is nil, else evaluate notNilBlock, passing the receiver.
- isNil
- Answer whether the receiver is the undefined object nil. Always answer true.
- notNil
- Answer whether the receiver is not the undefined object nil. Always answer false.
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