Architectural Patterns

Visitor

The visitor pattern represents an operation performed on the objects. It lets us define a new operation without changing the class elements on which it operates. In simple words, we use the visitor class to alter the execution of an algorithm as and when the visitor varies.

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Here are the benefits:

• Adding new operations over an object structure is straightforward and easy (by adding a new visitor)
• Visitor separates unrelated operations and gathers related operations

Impacts are as follows:

• The visitor class hierarchy can be difficult to maintain when a new concrete element class gets added
• Implementation often forces to provide public ...