Visitor
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| Visitor | |
| Contributors | Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides |
|---|---|
| Last modification | May 17, 2017 |
| Source | Gamma, Helm, Johnson & Vlissides (1995)[1], Visitor Pattern (2016)[2] |
| Pattern formats | OPR Alexandrian |
| Usability | |
| Learning domain | |
| Stakeholders | |
Represent an operation to be performed on the elements of an object structure. Visitor lets you define a new operation without changing the classes of the elements on which it operates.[1][2]
Context
Problem
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Solution
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Applied evaluation
Related patterns
Example
References
- ↑ 1.0 1.1 Gamma, E., Helm, R., Johnson, R. & Vlissides, J. (1995). Design Patterns: elements of reusable object-oriented software. Addison-Wesley: Boston, MA.ISBN 0-201-63361-2.
- ↑ 2.0 2.1 Visitor Pattern. (2016). Retrieved October 4, 2016 from http://c2.com/cgi/wiki?VisitorPattern.