19.0 Guide/Application Classes
Programmers may add or remove virtual methods, but may not add the first nor delete the last virtual method. Doing so will cause the creation or deletion of the vtable, resulting in a schema update.
Programmers may not change the type or order of data members of these frozen classes.
The list of frozen classes can be found in the file obschema.cc in the obDesign area. Part of this list includes TAttribute, TAttributeSet, TString, TProperty, specLine, multiSpecLine, attribute reference classes, and Poi derivatives.
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