Visitor

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Introduction

The Visitor is a behavioural pattern. It allows the designer to define new operations on an object structure and its elements, without modifying the object structure itself.

Description

The Visitor describes three distinct components:

  • Object Structure - Provides a visitor with access to its elements.
  • Element - Accepts visits.
  • Visitor - Accesses an element to perform operations.

Figure 1 graphically describes these Visitor pattern interactions.

Figure 1: A UML class diagram representing the Visitor structure
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