Smalltalk, Change superclass at runtime

Change superclass at runtime

Author	Message
Martin #1 / 3	Change superclass at runtime Hi, is there a method available to change the superclass of a class that avoids cyclic inheritance or how can I check cyclic inheritance before I send setSuperclass: to a certain class? I use VW7.1 Thanks, Martin
Mon, 07 Nov 2005 18:38:30 GMT

John Bran #2 / 3	Change superclass at runtime Quote: > is there a method available to change the superclass of a class that avoids > cyclic inheritance or how can I check cyclic inheritance before I send > setSuperclass: to a certain class? > I use VW7.1 You can check the hierarchy using the #includesBehavior: method (e.g., newSuperclass includesBehavior: subclass). However, why do you want to set the superclass? Can't you use the normal class creation messages? They already check for cyclic inheritance (see BehaviorBuilderRecord>>verify). John Brant
Mon, 07 Nov 2005 22:52:13 GMT

Vassili Byko #3 / 3	Change superclass at runtime Quote: > Hi, > is there a method available to change the superclass of a class that > avoids cyclic inheritance or how can I check cyclic inheritance before > I send setSuperclass: to a certain class? > I use VW7.1 User-level class modifications are normally done by ClassBuilder, so there is no such public method. The check is hidden inside ClassBuilderRecord, but it is trivial to do by yourself. If you assume that there is no circularity at the start, then the only class that can introduce it is the one you are about to change--meaning the test is newSuperclass withAllSuperclasses includes: aClass -- Vassili Bykov [\|] vassili "at" parcplace "dot" com VisualWorks Engineering, Tools Technical Lead [:s \| s, s printString] value: '[:s \| s, s printString] value: '
Mon, 07 Nov 2005 23:15:38 GMT

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