Chapter 8. Introduction to Design Patterns

Design patterns are efficient and elegant solutions to common problems in object-oriented software design. They are high-level abstract templates that can be applied to particular kinds of design problems.

8.1

Iteration and the Visitor Pattern

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In their very influential book, Design Patterns, Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides, often (affectionately) referred to as the “Gang of Four,” analyzed 23 specific patterns [Gamma95]. Each pattern has a section devoted to it, including

  • A pattern name

  • A description of the kinds of problems to which one might apply the pattern

  • An abstract description of a design problem and how its solution can be obtained

  • A discussion of the results and trade-offs ...

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