Book Image

Hands-On Design Patterns with C++ (Second Edition) - Second Edition

By : Fedor G. Pikus
5 (1)
Book Image

Hands-On Design Patterns with C++ (Second Edition) - Second Edition

5 (1)
By: Fedor G. Pikus

Overview of this book

C++ is a general-purpose programming language designed for efficiency, performance, and flexibility. Design patterns are commonly accepted solutions to well-recognized design problems. In essence, they are a library of reusable components, only for software architecture, and not for a concrete implementation. This book helps you focus on the design patterns that naturally adapt to your needs, and on the patterns that uniquely benefit from the features of C++. Armed with the knowledge of these patterns, you’ll spend less time searching for solutions to common problems and tackle challenges with the solutions developed from experience. You’ll also explore that design patterns are a concise and efficient way to communicate, as patterns are a familiar and recognizable solution to a specific problem and can convey a considerable amount of information with a single line of code. By the end of this book, you’ll have a deep understanding of how to use design patterns to write maintainable, robust, and reusable software.
Table of Contents (26 chapters)
1
Part 1: Getting Started with C++ Features and Concepts
5
Part 2: Common C++ Idioms
10
Part 3: C++ Design Patterns
18
Part 4: Advanced C++ Design Patterns

The decorator pattern

We will begin this study with the definitions of the two classic patterns. As we will see, on paper, the patterns, as well as the differences between them, are quite clear. Then, C++ comes in and blurs the lines by allowing design solutions that fall somewhere in-between the two. Still, the clarity of these simple cases is helpful, even if it gets muddled as we pile on the complexity. Let’s start with what is clear, then.

The decorator pattern is also a structural pattern; it allows a behavior to be added to an object. The classic decorator pattern extends the behavior of an existing operation that’s performed by a class. It decorates the class with the new behavior and creates an object of the new, decorated type. The decorator implements the interface of the original class and forwards the requests from its own interface to that class, but it also performs additional actions before and after these forwarded requests - these are the decorations...