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9 lines
429 B
Markdown
9 lines
429 B
Markdown
# Visitor
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## Purpose
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The Visitor Pattern lets you outsource operations on objects to other objects. The main reason to do this is to keep a separation of concerns.
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But classes have to define a contract to allow visitors (the `Role::accept` method in the example).
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The contract is an abstract class but you can have also a clean interface. In that case, each Visitor has to choose itself which method to invoke on the visitor.
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