Re: linker error in singleton implementation

Hi everyone,

 I have the following code and it gives a linker error on MS vc++ 6.0.

error LNK2001: unresolved external symbol "protected: __thiscall
Singleton::Singleton(void)" (??0Singleton@@IAE@XZ)

#include <stdlib.h>

class Singleton
  {
  public:
      static Singleton* Instance();
  protected:
     Singleton();
      Singleton(const Singleton&);
      Singleton& operator= (const Singleton&);
  private:
      static Singleton* pinstance;
  };

Singleton* Singleton::pinstance = 0;

Singleton* Singleton::Instance()
{
   pinstance = new Singleton();
   return pinstance;
}

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

Can anyone help in this regard?