Unlike Smalltalk, the metaclass of the root class inherits from the root class ( usually NSObject using the Cocoa framework ) itself.
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Metaclasses can be implemented by having classes be first-class citizen, in which case a metaclass is simply an object that constructs classes.
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Groovy's changes in code through prototyping are not visible in Java, since each attribute / method invocation in Groovy goes through the metaclass registry.
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Variable order metaclasses, on the other hand, can have instances, one example of variable order metaclass is the class of all fixed order classes.
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Together this implies that a class in Smalltalk is an object and that therefore a class needs to be an instance of a class ( called metaclass ).
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By contrast, in ObjVlisp, it is possible to define named metaclasses, and when defining a class one must specify which named metaclass it will instantiate.
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Like Smalltalk, in Objective-C, class methods are simply methods called on the class object, hence a class's class methods must be defined as instance methods in its metaclass.
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Classes and metaclasses are always created as a pair : the runtime has functions objc _ allocateClassPair ( ) and objc _ registerClassPair ( ) to create and register class-metaclass pairs, respectively.
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Thus evaluating Car class results in the metaclass object for Car whose name is Car class ( one can confirm this by evaluating Car class name which returns the name of the metaclass of Car .)
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Thus evaluating Car class results in the metaclass object for Car whose name is Car class ( one can confirm this by evaluating Car class name which returns the name of the metaclass of Car .)
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