#include<iostream>
using namespace std;
 
const int MAXNAME = 31;
 
struct Singleton {
    private:
 
    Singleton() {}
    Singleton(const Singleton&); // Disabling copy-ctor
    Singleton& operator=(const Singleton&);
 
    static Singleton* instance;
 
    public:
 
    int DeptNum;
    char Name[MAXNAME];
    int Age;
    int EmplID;  // key field
 
    static Singleton* GetInstance() {
        if (!instance)
            instance = new Singleton();
 
        return instance;
    }
 
};
 
Singleton* Singleton::instance = NULL;
//Singleton* TmpRec = Singleton* Singleton::instance;  <- COMMENTED BECAUSE WRONG
 
int main(void) {
 
   TmpRec = Singleton::GetInstance();
   TmpRec->DeptNum = 30;
   cout << "Value of DeptNum is: " << TmpRec->DeptNum << endl;
 
   return 0;
}
 

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