1.123.2 Object: built ins

= arg

Answer whether the receiver is equal to arg. The equality test is by default the same as that for identical objects. = must not fail; answer false if the receiver cannot be compared to arg

== arg

Answer whether the receiver is the same object as arg. This is a very fast test and is called ’object identity’.

allOwners

Return an Array of Objects that point to the receiver.

asOop

Answer the object index associated to the receiver. The object index doesn’t change when garbage collection is performed.

at: anIndex

Answer the index-th indexed instance variable of the receiver

at: anIndex put: value

Store value in the index-th indexed instance variable of the receiver

basicAt: anIndex

Answer the index-th indexed instance variable of the receiver. This method must not be overridden, override at: instead

basicAt: anIndex put: value

Store value in the index-th indexed instance variable of the receiver This method must not be overridden, override at:put: instead

basicPrint

Print a basic representation of the receiver

basicSize

Answer the number of indexed instance variable in the receiver

become: otherObject

Change all references to the receiver into references to otherObject. Depending on the implementation, references to otherObject might or might not be transformed into the receiver (respectively, ’two-way become’ and ’one-way become’). Implementations doing one-way become answer the receiver (so that it is not lost). Most implementations doing two-way become answer otherObject, but this is not assured - so do answer the receiver for consistency. GNU Smalltalk does two-way become and answers otherObject, but this might change in future versions: programs should not rely on the behavior and results of #become: .

becomeForward: otherObject

Change all references to the receiver into references to otherObject. References to otherObject are not transformed into the receiver. Answer the receiver so that it is not lost.

changeClassTo: aBehavior

Mutate the class of the receiver to be aBehavior. Note: Tacitly assumes that the structure is the same for the original and new class!!

checkIndexableBounds: index

Private - Check the reason why an access to the given indexed instance variable failed

checkIndexableBounds: index ifAbsent: aBlock

Private - Check the reason why an access to the given indexed instance variable failed. Evaluate aBlock for an invalid index.

checkIndexableBounds: index put: object

Private - Check the reason why a store to the given indexed instance variable failed

class

Answer the class to which the receiver belongs

halt

Called to enter the debugger

hash

Answer an hash value for the receiver. This hash value is ok for objects that do not redefine ==.

identityHash

Answer an hash value for the receiver. This method must not be overridden

instVarAt: index

Answer the index-th instance variable of the receiver. This method must not be overridden.

instVarAt: index put: value

Store value in the index-th instance variable of the receiver. This method must not be overridden.

isReadOnly

Answer whether the object’s indexed instance variables can be written

isUntrusted

Answer whether the object is to be considered untrusted.

makeEphemeron

Make the object an ’ephemeron’. An ephemeron is marked after all other objects, and if no references are found to the key except from the object itself, it is sent the #mourn message.

makeFixed

Avoid that the receiver moves in memory across garbage collections.

makeReadOnly: aBoolean

Set whether the object’s indexed instance variables can be written

makeUntrusted: aBoolean

Set whether the object is to be considered untrusted.

makeWeak

Make the object a ’weak’ one. When an object is only referenced by weak objects, it is collected and the slots in the weak objects are changed to nils by the VM; the weak object is then sent the #mourn message.

mark: aSymbol

Private - use this method to mark code which needs to be reworked, removed, etc. You can then find all senders of #mark: to find all marked methods or you can look for all senders of the symbol that you sent to #mark: to find a category of marked methods.

nextInstance

Private - answer another instance of the receiver’s class, or nil if the entire object table has been walked

notYetImplemented

Called when a method defined by a class is not yet implemented, but is going to be

perform: selectorOrMessageOrMethod

Send the unary message named selectorOrMessageOrMethod (if a Symbol) to the receiver, or the message and arguments it identifies (if a Message or DirectedMessage), or finally execute the method within the receiver (if a CompiledMethod). In the last case, the method need not reside on the hierarchy from the receiver’s class to Object – it need not reside at all in a MethodDictionary, in fact – but doing bad things will compromise stability of the Smalltalk virtual machine (and don’t blame anybody but yourself).

This method should not be overridden

perform: selectorOrMethod with: arg1

Send the message named selectorOrMethod (if a Symbol) to the receiver, passing arg1 to it, or execute the method within the receiver (if a CompiledMethod). In the latter case, the method need not reside on the hierarchy from the receiver’s class to Object – it need not reside at all in a MethodDictionary, in fact – but doing bad things will compromise stability of the Smalltalk virtual machine (and don’t blame anybody but yourself).

This method should not be overridden

perform: selectorOrMethod with: arg1 with: arg2

Send the message named selectorOrMethod (if a Symbol) to the receiver, passing arg1 and arg2 to it, or execute the method within the receiver (if a CompiledMethod). In the latter case, the method need not reside on the hierarchy from the receiver’s class to Object – it need not reside at all in a MethodDictionary, in fact – but doing bad things will compromise stability of the Smalltalk virtual machine (and don’t blame anybody but yourself).

This method should not be overridden

perform: selectorOrMethod with: arg1 with: arg2 with: arg3

Send the message named selectorOrMethod (if a Symbol) to the receiver, passing the other arguments to it, or execute the method within the receiver (if a CompiledMethod). In the latter case, the method need not reside on the hierarchy from the receiver’s class to Object – it need not reside at all in a MethodDictionary, in fact – but doing bad things will compromise stability of the Smalltalk virtual machine (and don’t blame anybody but yourself).

This method should not be overridden

perform: selectorOrMethod with: arg1 with: arg2 with: arg3 with: arg4

Send the message named selectorOrMethod (if a Symbol) to the receiver, passing the other arguments to it, or execute the method within the receiver (if a CompiledMethod). In the latter case, the method need not reside on the hierarchy from the receiver’s class to Object – it need not reside at all in a MethodDictionary, in fact – but doing bad things will compromise stability of the Smalltalk virtual machine (and don’t blame anybody but yourself).

This method should not be overridden

perform: selectorOrMethod withArguments: argumentsArray

Send the message named selectorOrMethod (if a Symbol) to the receiver, passing the elements of argumentsArray as parameters, or execute the method within the receiver (if a CompiledMethod). In the latter case, the method need not reside on the hierarchy from the receiver’s class to Object – it need not reside at all in a MethodDictionary, in fact – but doing bad things will compromise stability of the Smalltalk virtual machine (and don’t blame anybody but yourself).

This method should not be overridden

primitiveFailed

Called when a VM primitive fails

shallowCopy

Returns a shallow copy of the receiver (the instance variables are not copied)

shouldNotImplement

Called when objects belonging to a class should not answer a selector defined by a superclass

size

Answer the number of indexed instance variable in the receiver

subclassResponsibility

Called when a method defined by a class should be overridden in a subclass

tenure

Move the object to oldspace.