Design Patterns: Elements of Reusable Object-Oriented Software

Capturing a wealth of experience about the design of
object-oriented software, four top-notch designers present a
catalog of simple and succinct solutions to commonly occurring
design problems. Previously undocumented, these 23 patterns allow
designers to create more flexible, elegant, and ultimately reusable
designs without having to rediscover the design solutions
themselves.

The authors begin by describing what patterns are and how they
can help you design object-oriented software. They then go on to
systematically name, explain, evaluate, and catalog recurring
designs in object-oriented systems. With Design Patterns as your
guide, you will learn how these important patterns fit into the
software development process, and how you can leverage them to
solve your own design problems most efficiently.

Each pattern describes the circumstances in which it is
applicable, when it can be applied in view of other design
constraints, and the consequences and trade-offs of using the
pattern within a larger design. All patterns are compiled from real
systems and are based on real-world examples. Each pattern also
includes code that demonstrates how it may be implemented in
object-oriented programming languages like C++ or Smalltalk.

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