Subclassing pfObject

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Angel-Ventura Mendo Gomez (ventura++at++labri.u-bordeaux.fr)
Tue, 11 May 1999 10:50:13 +0200

Hi performers :

        I try to make a class GeoSetEditor:

class GeoSetEditor: public pfObject
{
 public:
  GeoSetEditor(void);
  GeoSetEditor(const GeoSetEditor&);
  virtual ~GeoSetEditor(void);

  void init(void);

  virtual void draw(void);
  //
  // Handlers
  //
  static void motionNotifyEventHandler(const pfCoord &cord,int
buttonMask,void *userData);
  static void buttonPressEventHandler(const pfCoord &cord,int
button,void *userData);
  static void buttonReleaseEventHandler(const pfCoord &cord,int
button,void *userData);
protected:
  void makeGeoSet(void *arena);

private:
  static pfType *classType;
   
  void *arena;

  pfVec3 *coords;
  pfVec4 *colors;

  pfGeoSet *gset;
};

And the problem is that for multiprocessing this class must be at the
shared arena , I think that the right
way to do this is to make pfObject the parent class of GeoSetEditor.

The constructor looks like :

pfType *GeoSetEditor::classType = NULL;

void
GeoSetEditor::init(void)
{
  fprintf(stderr,"+++ GeoSetEditor::init(void)\n");
  if (classType == NULL){
    pfObject::init();
    classType =
      new pfType(pfObject::getClassType(), "GeoSetEditor");
  }
  arena=pfGetSharedArena(); // I would Get the current Shared Arena for
"this" : new(arena) GeoSetEditor
                             // -------------- ^
                             // | |
                             // ------------------------------------
  makeGeoSet(arena);

  fprintf(stderr,"--- GeoSetEditor::init(void)\n");
}

GeoSetEditor::GeoSetEditor(void *arena):
  arena(arena)
{
  fprintf(stderr,"+++ GeoSetEditor::GeoSetEditor(void *arena):\n");
  init();
  setType(classType);
  fprintf(stderr,"--- GeoSetEditor::GeoSetEditor(void *arena):\n");
   
}

The questions :

        1) That's right ? the class is allocated on the shared arena ?
        2) When I create the GeoSetEditor, the pfGeoSet must be already created
at the shared arena.
           At the init() function I get the default Shared Arena but I would
like to put the pfGeoSet
           in the same Arena that the GeoSetClass.

                Thanks

-- 
	ventura++at++labri.u-bordeaux.fr
	http://dept-info.labri.u-bordeaux.fr/~ventura
	telephone 05.56.84.69.20


 Quod natura non dat Salmantica non praestat.

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