Lecture 19 Objectives

KNOW:

• That the visitor pattern provides a framework for traversing a data structure, where the components of the data structure can be one of some number of variants
• That to implement the visitor pattern, we must create a class of function objects that know how to handle each type of variant

BE ABLE TO:

• Create a class of function objects that act as visitors
• Use the visitor objects to process each component in a data structure

Sample Exam Question:

Every variant of AbsMenuItem defines the method accept() the same way:

public boolean accept(ICount matcher){
  return matcher.shouldCount(this):
}