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

Concepts and constraints in C++20

The rest of this chapter is all about the “artificial” substitution failures that are added to the template declaration to impose restrictions on the template arguments. In this section, we are going to learn about the new, C++20, way of coding these restrictions. In the next section, we will show what you can do if you can’t use C++20 but still want to constrain your templates.

Constraints in C++20

C++20 changed the way we are using SFINAE to restrict template arguments by introducing concepts and constraints. Even though the overall feature is usually referred to as “concepts,” it is the constraints that are the most important part. What follows is not a complete or formal description of these features, but rather a demonstration of the best practices (it may be too early to say “patterns” since the community is still in the process of establishing what is and isn’t sufficiently widely...