CPP
cpp
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#include <iostream>
#include <mutex>
using namespace std;
class singleton
{
public:
static singleton* getPointer()
{
if(pInstance == nullptr)
{
lock_guard<mutex> u(m);
if(pInstance == nullptr)
pInstance = new singleton;
}
return pInstance;
}
private :
static singleton* pInstance;
static mutex m;
singleton() = default;
singleton(const singleton&) = default ;
};
singleton* singleton::pInstance = nullptr;
mutex singleton::m;
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