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Object-Oriented Design Choices
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Object-Oriented Design ChoicesНазвание: Object-Oriented Design Choices
Автор: Adair Dingle
Издательство: CRC Press
Год: 2021
Страниц: 349
Язык: английский
Формат: pdf (true)
Размер: 10.1 MB

Do modern programming languages, IDEs, and libraries make coding easy? Maybe, but coding is not design. Large-scale or expensive apps clearly require evaluation of design choices. Still, software design directly impacts code reuse and longevity even for small-scale apps with limited overhead. This text evaluates and contrasts common object-oriented designs.

A given problem may have many solutions. A developer may employ different design techniques - composition, inheritance, dependency injection, delegation, etc. - to solve a particular problem. A skilled developer can determine the costs and benefits of different design responses, even amid competing concerns. A responsible developer documents design choices as a contract with the client, delineating external and internal responsibilities. To promote effective software design, this book examines contractual, object-oriented designs for immediate and sustained use as well as code reuse. The intent of identifying design variants is to recognize and manage conflicting goals such as short versus long-term utility, stability versus flexibility, and storage versus computation. Many examples are given to evaluate and contrast different solutions and to compare C# and C++ effects. No one has a crystal ball; however, deliberate design promotes software longevity. With the prominence of legacy OO code, a clear understanding of different object-oriented designs is essential.

Design questions abound. Is code reuse better with inheritance or composition? Should composition rely on complete encapsulation? Design choices impact flexibility, efficiency, stability, longevity, and reuse, yet compilers do not enforce design and syntax does not necessarily illustrate design. Through deliberate design, or redesign when refactoring, developers construct sustainable, efficient code.

Who should read this book?
This text originated from material developed and updated for an advanced undergraduate course on software design. Students then are a natural audience. Entry-level or immediate developers, especially those responsible for maintaining or refactoring a legacy system written in an Object-Oriented Programming Language (OOPL), may benefit from this explicit exposition of object-oriented design as well as the evaluation of design variants. Some software development experience is assumed, as is knowledge of basic data structures. Expertise with any particular language, platform, or IDE is not required. Auxiliary definitions and references are noted in the text. Appendix A reinforces indirection and details relevant to C++ and C#. Appendices B and C present and analyze substantive design examples. An extensive glossary is included, defining over 150 common terms associated with software design.

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