Write a program to use of singleton pattern.
#include<iostream>
using namespace std;
class A
{
public:
static bool flag;
static A* get_obj();
void fun()
{
cout << "function" << endl;
}
};
bool A :: flag = false;
A* A :: get_obj()
{
static A *p;
if(flag == false)
{
cout << "Created new" << endl;
p = new A;
flag = true;
return p;
}
else
{
cout << "Same" << endl;
return p;
}
}
int main()
{
A *ob1,*ob2,*ob3,*ob4,*ob5;
ob1 = A :: get_obj();
ob1->fun();
cout << ob1 << endl;
ob2 = A :: get_obj();
ob2->fun();
cout << ob2 << endl;
ob3 = A :: get_obj();
ob3->fun();
cout << ob3 << endl;
ob4 = A :: get_obj();
ob4->fun();
cout << ob4 << endl;
ob5 = A :: get_obj();
ob5->fun();
cout << ob5 << endl;
return 0;
}
Output
Created new function 0x3721c8 Same function 0x3721c8 Same function 0x3721c8 Same function 0x3721c8 Same function 0x3721c8