Re: Thread safe Singleton class

I was informed by my colleague that the following code is not
thread safe but I still don't know why because his arguments
weren't very convincing.

//Singleton.h
class Singleton
{
private:
static Singleton instance;
Singleton(){}
Singleton(const Singleton&){}
Singleton& operator=(Singleton const&){}
public:
static Singleton& getInstance();
};

//Singleton.cpp
#include "Singleton.h"
Singleton Singleton::instance;

Singleton& Singleton::getInstance()
{
return instance;
}

Since am maintaining a static instance this should be created
only once irrespective of how many threads are accessing the
getInstance() function at the same time. So is this code not
thread safe?