// Online C++ compiler to run C++ program online
#include <iostream>

class Add{
    public:
        static Add& getInstance(){
            static Add instance; // Thread-safe in C++11 and later
            return instance;
        }
        
        int add(int a, int b){
            return a+b;
        }
        
    private:
        Add() = default;
        ~Add() = default;
        
        Add(const Add&) = delete;
        Add& operator = (const Add&) = delete;
        //✅ Yes: Add(const Add&) is the copy constructor (a special function).
        //✅ It takes a parameter of type const Add& (reference to const Add).
        //✅ The = delete part disables this copy constructor. It doesn’t delete objects—it just forbids copying.
        
        
        //delte copy dn move
        
};

int main() {
    // Write C++ code here
    Add::getInstance();
    
    int a = Add::add(5,6);
    std::cout<<a<<std::endl;

    return 0;
}