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

ScopeGuard

This chapter covers a pattern that can be seen as a generalization of the RAII idiom we studied earlier. In its earliest form, it is an old and established C++ pattern, however, it is also one that has particularly benefited from the language additions in C++11, C++14, and C++17. We will witness the evolution of this pattern as the language becomes more powerful. The ScopeGuard pattern exists at the intersection of declarative programming (say what you want to happen, not how you want it done) and error-safe programs (especially exception safety). We will have to learn a bit about both before we fully understand ScopeGuard.

The following topics will be covered in this chapter:

  • How can we write error-safe and exception-safe code? How does RAII make error handling easier?
  • What is composability as applied to error handling?
  • Why is RAII not powerful enough for error handling, and how is it generalized? How can we implement declarative error handling in C+...