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Why I am getting linking error:

vrbilgi10 (5)
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class Singleton
{
private:
 static Singleton* _SInstance;
public:
    Singleton(){}
    static void _GetInstance()
    {
       _SInstance = new Singleton();
    }
};
//Singleton * Singleton::_SInstance=NULL;

int main()
{
   Singleton::_GetInstance();
   return 0;
}


In the above program when I compile I am getting linking
Error: undefined reference to 'Singleton::_SInstance'
But when I Initializing NULL to the _SInstance in global scope.
Its works fine.

So my question is why the linking error? When it is not Initialized
ne555 (10692)
vrbilgi10 (5)
@ne555: Thanks for replying. I got the answer now.

I modified my Singleton class to unserstand the Static variable behaviour and posted here.
suhastheju (10)
put the constructor under private. Otherwise there is no point in making it singleton.
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