Thread: Templated singleton classes

I'm using the following singleton model for all of my resource managers.

Code:

#pragma once

class CSingleton
{
  private:
    static CSingleton *m_pInstance;
  protected:
    CSingleton();
    CSingleton(const CSingleton&);
    CSingleton& operator(const CSingleton&);
  public:
    static CSingleton *Instance();
};

Code:

#include "CSingleton.h"

CSingleton *CSingleton::m_pInstance=NULL;

CSingleton *CSingleton::Instance()
{
  if (m_pInstance==NULL)  m_pInstance=new CSingleton;
  return m_pInstance;
}

My resource managers are then derived from CSingleton.
How would I go about creating a templated version of this singleton class to allow for differing types w/o having to derive from CSingleton?

You could try something like this

Code:

#pragma once

template<class T>
class CSingleton
{
  private:
    static T *m_pInstance;
  protected:
    CSingleton();
    CSingleton(const CSingleton&);
    CSingleton& operator=(const CSingleton&);
  public:
    static T *Instance();
};

Code:

#include "CSingleton.h"

T *CSingleton::m_pInstance=0;

T *CSingleton::Instance()
{
  if (m_pInstance == 0)  m_pInstance=new T();
  return m_pInstance;
}