SoSFEngine.h

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**=======================================================================*/
/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_SF_ENGINE_
#define  _SO_SF_ENGINE_
 
class SoEngine;
 
#include <Inventor/fields/SoSubField.h>
 
//
//  SoSFEngine subclass of SoSField. The field value is a pointer to an
//  SoEngine. The field automatically maintains a reference to the engine
//  it points to and propagates notification from the engine.
//
 
class  SoSFEngine : public SoSField {
 
  // Use standard field stuff
  SO_SFIELD_HEADER(SoSFEngine, SoEngine *, SoEngine *);
 
 private:
  static void         initClass();
  static void exitClass();
 
  // Update a copied field to use the copy of the engine if there is one
  virtual void        fixCopy(SbBool copyConnections);
 
  // Override this to also check the stored engine
  virtual SbBool      referencesCopy() const;
 
 private:
  // Override this to maintain write-references in engine
  virtual void        countWriteRefs(SoOutput *out) const;
 
  // Changes value in field without doing other notification stuff.
  // Keeps track of references and auditors.
  void                setVal(SoEngine *newValue);
 
};
 
#endif /* _SO_SF_ENGINE_ */