🔑 Singleton Design Pattern 🎯
The Singleton pattern ensures that a class has only one instance
throughout the entire application, providing a global access point for it.
🛠️ This is especially useful when we need a single object to handle tasks across various parts of the system. 🌍
Types of Singleton Implementations 🤖
1️⃣ Eager Initialization ⚡
- 🏁 Instant Creation: The instance is created as soon as the program starts.
- ✅ Thread-Safe: Automatically safe from thread issues because it’s initialized during static setup.
- ❌ Resource Waste: If the instance isn’t used, it still consumes resources.
2️⃣ Lazy Initialization 🕒
- 🚪 Lazy Loading: The instance is only created when first accessed.
- ⚠️ Not Thread-Safe: May cause multiple instances in a multi-threaded environment.
- 🧠 Efficient: Works best for single-threaded apps or when instance creation is not always needed.
3️⃣ Thread-Safe Singleton 🔒
- 🔑 Thread-Safe: Guarantees only one instance even in multi-threaded environments.
- 💡 Uses
std::call_once and std::once_flag to prevent race conditions.
Conclusion 🎬
The Singleton pattern is a powerful tool to ensure controlled access to a class’s instance,
but remember, it comes with its own trade-offs.
Whether you use eager, lazy, or thread-safe methods depends on your use case! 🌱