Singlton Example (Design Pattern)

singlton.cpp

#include <iostream>

using namespace std;

class Singlton {

public:
  static Singlton* getInstance() {    
    static Singlton* instance = nullptr; 
    
    if (instance == nullptr)
      instance = new Singlton();
    
    return instance;
  }
  
  void print() {
    cout << "I'm singlton!" << endl; 
  }
};

int main() {
  Singlton* s = Singlton::getInstance();
  s->print();

  return 0;
}