CPP
cpp
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#include <iostream>
#include <mutex>
using namespace std;
class singleton
{
public:
static singleton* getSingleton();
void display();
private:
static singleton* pObj;
singleton() = default ;
singleton(const singleton& obj) = default ;
static mutex m;
};
singleton* singleton::pObj = nullptr ;
mutex singleton::m;
void singleton::display()
{
cout << this << endl;
}
singleton* singleton::getSingleton()
{
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