TAILIEUCHUNG - The Art of the Metaobject Protocol- P9

The Art of the Metaobject Protocol- P9: The work described here is synthetic in nature, bringing together techniques and insights from several branches of computer. | Generic Functions and Methods validate-superclass 241 The superclass argument is a class metaobject. Values This generic function returns true or false. Purpose This generic function is called to determine whether the class superclass is suitable for use as a superclass of class. This generic function can be be called by the implementation or user code. It is called during class metaobject initialization and reinitialization before the direct superclasses are stored. If this generic function returns false the initialization or reinitialization will signal an error. Methods validate-superclass Primary Method .class class superclass class This method returns true in three situations i If the superclass argument is the class named t ii if the class of the class argument is the same as the class of the superclass argument or iii if the classes one of the arguments is standard-class and the class of the other is funcallable-standard-class. In all other cases this method returns false. This method can be overridden. Remarks Defining a method on validate-superclass requires detailed knowledge of of the internal protocol followed by each of the two class metaobject classes. A method on validate-superclass which returns true for two different class metaobject classes declares that they are compatible. 242 writer-method-class Chapter 6 writer-method-class Generic Function Syntax writer-method-class class direct-slot fcrest initargs Arguments The class argument is a class metaobject. The direct-slot argument is a direct slot definition metaobject. i The initargs argument is a list of initialization arguments and values. Values The value returned is a class metaobject. Purpose This generic function is called to determine the class of writer methods created during class initialization and reinitialization. The result must be a subclass of standardwriter-method. The initargs argument must be the same as will be passed to make-instance to create the reader method. The initargs .

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