🎯 GoF Design Patterns in C++

This repository contains clean, modular implementations of the 23 Gang of Four (GoF) design patterns using modern C++ (C++17).

Each pattern is placed in its own subdirectory, includes a small demo (main.cpp), and is compiled using CMake.

---

🧠 What are GoF Patterns?

The "Gang of Four" refers to the four authors of the book:

Design Patterns: Elements of Reusable Object-Oriented Software (1994)

by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides.

They documented 23 design patterns, categorized into:

• Creational (object creation)
• Structural (object composition)
• Behavioral (communication & flow)

---

📁 Project Structure

GoF-Patterns-in-Cpp/
├── CMakeLists.txt
├── README.md
├── Creational/
│   ├── CMakeLists.txt
│   ├── Singleton/
│   ├── FactoryMethod/
│   ├── AbstractFactory/
│   └── Builder/
├── Structural/
│   ├── CMakeLists.txt
│   ├── Adapter/
│   ├── Composite/
│   ├── Decorator/
│   └── Proxy/
├── Behavioral/
│   ├── CMakeLists.txt
│   ├── Strategy/
│   ├── Observer/
│   ├── Command/
│   ├── TemplateMethod/
│   └── State/
└── build/                 # CMake build folder (not checked in)

---

🚀 Getting Started

✅ Requirements:

• CMake >= 3.10
• C++17-compatible compiler (e.g., g++, clang++)

🧪 Build & Run Example:

# Clone the repo
cd GoF-Patterns-in-Cpp
mkdir build && cd build
cmake ..
make

# Run Singleton demo
./Creational/Singleton/SingletonDemo

---

✅ Completed Patterns

Category	Pattern
Creational	✅ Singleton
Creational	✅ Factory Method
Creational	✅ Abstract Factory
Creational	✅ Builder
Structural	✅ Adapter
Structural	✅ Composite
Structural	✅ Decorator
Structural	✅ Proxy
Behavioral	✅ Strategy
Behavioral	✅ Observer
Behavioral	✅ Command
Behavioral	✅ Template Method
Behavioral	✅ State

---

🧩 Learning Goals

• Master the 23 GoF patterns in hands-on C++
• Apply patterns in real-world projects like GenCamPP
• Improve system design, modularity, and readability

---

📅 Learning Schedule

Week	Focus
Week 1	Creational Patterns (5)
Week 2	Structural Patterns (7)
Week 3	Behavioral Patterns (11)

---

📚 References

• "Design Patterns: Elements of Reusable Object-Oriented Software" (GoF)
• "Head First Design Patterns" (O’Reilly)
• "Design Patterns in Modern C++" by Dmitri Nesteruk

---

Feel free to fork, clone, and experiment!

⭐ Star this repo if you're learning GoF patterns in C++!

---

Maintained by [Naveen Kumar Bisai](https://github.com/NaveenkumarBisai ✨