Using the One Pass Visitor

• Inherit from TOP_DOWN_VISITOR

• Redefine each of the visit_<metaclass> call that you want to add additional processing.

• Define the body of what you want to do for each of the visit_<metaclass> call.

• Add a call back to the ancestor ’s visit_<metaclass> using the Precursor construct at the end.

• Example:

visit_uml_class(node : UML_CLASS) is

do

-- do my stuff first

-- then, call ancestor ’s method to complete traversal

Precursor(node)

end -- visit_uml_class

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