Class-variables may be used as defaults for instance-variables that
can be modified through the Defaults file. For example,
class
text defines both the
instance- and class-variable font. The class-variable defines
the default font, while the font can be modified explicitely at
instance-initialisation, or using the ->font
method afterwards.
If a class defines both an instance- and a class-variable with the same name, object-allocation will use the constant @class_default for the initial value of the slot. First access will replace this value using the value from the class-variable.
Instance-variables supercede class-variables for get-behaviour. To access the class-variable explicitly, use the methods from section 8.1.