<p>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.</p><p>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.</p><p>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. </p>
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