Design Patterns in C++: 23 Classic Templates with Examples

Design patterns are proven solutions to typical problems that arise during software development. This book is dedicated to the classic patterns from the famous "Gang of Four" (GoF), but focuses on their implementation specifically in C++, taking into account the modern C++17 and C++20 standards.

The author does not simply retell the theory — each chapter contains a detailed analysis of the problem, the pattern structure, class diagrams, and most importantly, complete C++ code that can be immediately used in your projects. Special attention is paid to C++ idioms: RAII, smart pointers, move semantics, lambda expressions, and templates.

What you will learn from the book:

• Creational Patterns: Singleton, Factory Method, Abstract Factory, Builder, Prototype — how to create objects flexibly without binding to specific classes.
• Structural Patterns: Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy — how to build flexible and extensible class hierarchies.
• Behavioral Patterns: Chain of Responsibility, Command, Iterator, Mediator, Memento, Observer, State, Strategy, Template Method, Visitor — how to organize interaction between objects.
• Modern C++ Features: Using std::any, std::variant, std::function, and variadic templates for elegant pattern implementation.
• Anti-patterns and Common Mistakes: Analysis of typical pitfalls that developers encounter when trying to apply patterns "head-on."

Who this book is for:

• Junior developers who have already mastered C++ syntax and want to move to the next level — writing architecturally correct code.
• Middle developers looking to systematize their knowledge and get acquainted with pattern implementations in modern C++.
• Technical students studying object-oriented programming and software design.
• Anyone preparing for interviews at large IT companies, where pattern questions are a mandatory part.

The book is written in a lively, accessible language. Each pattern is accompanied by a real-world example from practice (game engine, parser, GUI library). All source codes are available for download and have been tested with GCC and Clang compilers.

By mastering the material in this book, you will learn not just to "know patterns," but to understand when and why to apply them. This will transform you from a programmer who writes working code into an engineer who creates flexible, maintainable, and scalable architecture.