Design Patterns - EduardoMSU/OOP-2143 GitHub Wiki

Design Patterns in Software Development

What Are Design Patterns?

Design patterns are reusable solutions to common problems in software design. They provide best practices and templates for solving recurring challenges, enhancing code reusability, maintainability, and scalability.

Categories of Design Patterns

Category Purpose Examples
Creational Patterns Focus on object creation mechanisms to increase flexibility and reuse. Singleton, Factory Method, Builder, Prototype
Structural Patterns Deal with the composition of classes and objects to form larger structures. Adapter, Bridge, Composite, Decorator
Behavioral Patterns Concerned with communication and responsibilities between objects. Observer, Strategy, Command, State, Iterator

Examples of Popular Design Patterns

1. Singleton Pattern

Ensures a class has only one instance and provides a global point of access to it.

Feature Explanation
Purpose Prevents multiple instances of a class.
Use Cases Logging, configuration management, database connections.

Example in C++:

#include <iostream>

class Singleton {
private:
    static Singleton* instance;  // Static instance pointer
    Singleton() {}               // Private constructor

public:
    // Method to get the single instance
    static Singleton* getInstance() {
        if (!instance)
            instance = new Singleton();
        return instance;
    }

    void showMessage() const {
        std::cout << "Singleton instance accessed!" << std::endl;
    }
};

// Initialize static member
Singleton* Singleton::instance = nullptr;

int main() {
    Singleton* singleton = Singleton::getInstance();
    singleton->showMessage();

    return 0;
}
⚠️ **GitHub.com Fallback** ⚠️