Re: linker error in singleton implementation

From:

sam_cit@yahoo.co.in

Newsgroups:

comp.lang.c++

Date:

Sat, 14 Jul 2007 08:22:26 -0700

Message-ID:

<1184426546.302549.162950@m37g2000prh.googlegroups.com>

On Jul 14, 8:14 pm, Erik Wikstr=F6m <Erik-wikst...@telia.com> wrote:

On 2007-07-14 16:43, sam_...@yahoo.co.in wrote:

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?

Implement the constructor.

--
Erik Wikstr=F6m- Hide quoted text -

- Show quoted text -

Thanks everyone, and by the way i was just thinking of moving the
cons, copy cons and operator function to private section, wouldn't
that also server the purpose of singleton implementation?

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