How do I implement Singleton safely (or avoid it)?

Implementing a Singleton in C++ can often lead to issues, particularly with multithreading and resource management. However, you can implement it safely using modern C++ techniques. Below is an example of a thread-safe Singleton pattern using static local variables in combination with the Meyers' Singleton approach.


        #include 
        #include 
        
        class Singleton {
        public:
            // Deleted copy constructor and assignment operator
            Singleton(const Singleton&) = delete;
            Singleton& operator=(const Singleton&) = delete;

            // Static method to access the instance
            static Singleton& getInstance() {
                static Singleton instance; // Guaranteed to be destroyed
                return instance; // Instantiated on first use
            }

            void someBusinessLogic() {
                // Some business logic here
            }

        private:
            Singleton() {} // Constructor is private
        };
        
        int main() {
            Singleton& instance = Singleton::getInstance();
            instance.someBusinessLogic();
            return 0;
        }

How do I implement Singleton safely (or avoid it)?

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How do I implement Singleton safely (or avoid it)?

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