16: Design patterns

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This

chapter introduces the important and yet non-traditional “patterns”

approach to program design.

Probably

the most important step forward in object-oriented design is the “design

patterns” movement, chronicled in

Design
Patterns
,
by Gamma, Helm, Johnson & Vlissides (Addison-Wesley 1995).
[70]
That book shows 23 different solutions to particular classes of problems. In
this chapter, the basic concepts of design patterns will be introduced along
with several examples. This should whet your appetite to read
Design
Patterns

(a source of what has now become an essential, almost mandatory, vocabulary for
OOP programmers).

The

latter part of this chapter contains an example of the design evolution

process, starting with an initial solution and moving through the logic and

process of evolving the solution to more appropriate designs. The program shown

(a trash sorting simulation) has evolved over time, and you can look at that

evolution as a prototype for the way your own design can start as an adequate

solution to a particular problem and evolve into a flexible approach to a class

of problems.

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[70]

But be warned: the examples are in C++.

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