Common/vtkInstantiator.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkInstantiator.h,v $
  Language:  C++

  Copyright (c) 1993-2002 Ken Martin, Will Schroeder, Bill Lorensen 
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef __vtkInstantiator_h
#define __vtkInstantiator_h

#include "vtkObject.h"

// The vtkDebugLeaks singleton must be initialized before and
// destroyed after the vtkInstantiator singleton.
#include "vtkDebugLeaksManager.h" // Needed for proper singleton initialization

class vtkInstantiatorInitialize;
class vtkInstantiatorHashTable;

class VTK_COMMON_EXPORT vtkInstantiator : public vtkObject
{
public:
  static vtkInstantiator* New();
  vtkTypeRevisionMacro(vtkInstantiator,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);
  
  static vtkObject* CreateInstance(const char* className);
  
  //BTX
  typedef vtkObject* (*CreateFunction)();


  static void RegisterInstantiator(const char* className,
                                   CreateFunction createFunction);


  static void UnRegisterInstantiator(const char* className,
                                     CreateFunction createFunction);
  //ETX
  
protected:
  vtkInstantiator();
  ~vtkInstantiator();
  
  // Internal storage for registered creation functions.
  static vtkInstantiatorHashTable* CreatorTable;
  
  static void ClassInitialize();
  static void ClassFinalize();
  
  //BTX
  friend class vtkInstantiatorInitialize;
  //ETX
  
private:
  vtkInstantiator(const vtkInstantiator&);  // Not implemented.
  void operator=(const vtkInstantiator&);  // Not implemented.
};

//BTX
// Utility class to make sure vtkInstantiator is initialized before it
// is used.
class VTK_COMMON_EXPORT vtkInstantiatorInitialize
{
public:
  vtkInstantiatorInitialize();
  ~vtkInstantiatorInitialize();
private:
  static unsigned int Count;
};

// This instance will show up in any translation unit that uses
// vtkInstantiator.  It will make sure vtkInstantiator is initialized
// before it is used.
static vtkInstantiatorInitialize vtkInstantiatorInitializer;
//ETX

#endif

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