Summary

In this chapter, we’ve explored some of the key design patterns that can be instrumental in refactoring legacy C++ code, including the strategy pattern, template method pattern, and observer pattern. These patterns, when applied judiciously, can significantly improve the structure of your code, making it more flexible, maintainable, and resilient to change.

While we’ve provided practical, real-world examples to illustrate the use of these patterns, this is by no means an exhaustive treatment. Design patterns are a vast and deep subject, with many more patterns and variations to explore. For a more comprehensive understanding of design patterns, I strongly recommend you delve into the seminal work Design Patterns: Elements of Reusable Object-Oriented Software by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides, often referred to as the Gang of Four book.

In addition, to keep abreast of the most recent developments and emerging best practices,...