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/home/pauldt/projects/IDEA/IDEA-ALL/IDEA-DEV/Core/Utilities/Includes/Singleton.hh

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// -*- Mode: c++ -*-
//      CVS: $Id: Singleton.hh,v 1.4 2006/01/06 01:18:42 chucko Exp $
//      Tag: $name$
//     Info: $CVSROOT/IDEA-DEV/COPYRIGHT

#ifndef SINGLETON_HEADER_FILE_
#define SINGLETON_HEADER_FILE_

#include <cstdlib> // for std::atexit()

namespace IDEA
{
  template < typename T >
  class Singleton 
  {
  public:
    inline static T* instance() 
    {

      if (getInstance() == 0) 
        {
          getInstance() = new T;

          std::atexit(Singleton::release);
        }

      return getInstance();
    }
  protected:
    Singleton() {}
    Singleton( T* pInstance ) { getInstance() = pInstance; }
    Singleton(const Singleton &);
    Singleton& operator=(const Singleton&);
    ~Singleton() { getInstance() = 0; /* do not delete */ } 
    static T*& getInstance()
    {
      static T* s_Instance = 0;

      return s_Instance;
    }
    static void release() 
      {
        if ( getInstance() != 0 ) 
          {
            delete(getInstance());
            getInstance() = 0;
          }
      }
    private:
    static T* s_Instance;
    };
  }

#endif //SINGLETON_HEADER_FILE_

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