Lecture 20 Objectives

At the end of today's class you should

KNOW:

Under what circumstances one should consider using the visitor pattern
That the visitor pattern makes it easy to provide additional functionality
That the visitor pattern makes it relatively difficult to add additional variants to the component type

BE ABLE TO:

Use a visitor to organize a Java program such that the traversal of a data structure is separate from the operations on each element of the structure

Sample Exam Question:

Add a new operation to the IProc interface, using a class called HasRefs. The methods in HasRefs return true if any of the formulas contain references.