Possibly an inheritance problem with QObject?

[chadkeck]

I've got classes set up like so (where an indent is inherits from):

Wizzy
    BranchWizzy
    InputWizzy
    LoopWizzy
    NamedWizzy
          DatumWizzy
          ProcedureWizzy 
    OutputWizzy
    SinkWizzy
    SourceWizzy

Wizzy
    BranchWizzy
    InputWizzy
    LoopWizzy
    NamedWizzy
          DatumWizzy
          ProcedureWizzy 
    OutputWizzy
    SinkWizzy
    SourceWizzy

To copy to clipboard, switch view to plain text mode 

The problem is that when I try to include and use any class at the same level (e.g. Have an OutputWizzy create a BranchWizzy) it won't compile and gives the following message when trying to instantiate a BranchWizzy:

OutputWizzy.cpp: In constructor `OutputWizzy::OutputWizzy(QObject*)':
OutputWizzy.cpp:9: error: `b' undeclared (first use this function)
OutputWizzy.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
OutputWizzy.cpp:9: error: `BranchWizzy' is not a type

OutputWizzy.cpp: In constructor `OutputWizzy::OutputWizzy(QObject*)':
OutputWizzy.cpp:9: error: `b' undeclared (first use this function)
OutputWizzy.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
OutputWizzy.cpp:9: error: `BranchWizzy' is not a type

To copy to clipboard, switch view to plain text mode 

I'm using Qt 4.4.3 and mingw on Windows XP.
Everything compiles fine if I don't have a Wizzy subclass try to use any other Wizzy subclass.

Here's a snip of the Wizzy.h:

#ifndef WIZZY_H
#define WIZZY_H
 
#include "Property.h"
#include <QtGui>
 
class WizzyConnectionPoint;
 
class Wizzy : public QObject, public QGraphicsPixmapItem
{
   Q_OBJECT
 
   public:
      Wizzy( QObject* = NULL );
      ~Wizzy();
/* snip */
};
#endif

#ifndef WIZZY_H
#define WIZZY_H

#include "Property.h"
#include <QtGui>

class WizzyConnectionPoint;

class Wizzy : public QObject, public QGraphicsPixmapItem
{
   Q_OBJECT

   public:
      Wizzy( QObject* = NULL );
      ~Wizzy();
/* snip */
};
#endif

To copy to clipboard, switch view to plain text mode 

The Wizzy subclasses inherit the Wizzy class in a similar manner. I am simply out of ideas of why one subclass "can't see" another.

Any ideas? I can post any other code anyone would like to see. Thanks!

[Ginsengelf]

It would be helpful to see outputwizzy.cpp...

[spirit]

multiply inheritance of QObject is not allowed in Qt4.

[Ginsengelf]

But QGraphicsPixmapItem is not derived from QObject, so that shouldn't cause an error.

Ginsengelf

[pastor]

It would be nice to look at outputwizzy.h

[spirit]

But QGraphicsPixmapItem is not derived from QObject, so that shouldn't cause an error.

Ginsengelf

sure, I didn't notice that.

[chadkeck]

Here's the header for the OutputWizzy:

#ifndef OUTPUT_WIZZY_H
#define OUTPUT_WIZZY_H
 
#include "Wizzy.h"
#include <QtGui>
class WizzyConnectionPoint;
 
class OutputWizzy : public Wizzy
{
   Q_OBJECT
 
   public:
      OutputWizzy( QObject* = NULL );
/* snip */
};
#endif

#ifndef OUTPUT_WIZZY_H
#define OUTPUT_WIZZY_H

#include "Wizzy.h"
#include <QtGui>
class WizzyConnectionPoint;

class OutputWizzy : public Wizzy
{
   Q_OBJECT

   public:
      OutputWizzy( QObject* = NULL );
/* snip */
};
#endif

To copy to clipboard, switch view to plain text mode 

And here's the code for the implementation:

#include "OutputWizzy.h"
 
#include "WizzyConnectionPoint.h"
#include <QtGui>
 
#include "BranchWizzy.h"
OutputWizzy::OutputWizzy( QObject *p_parent ) : Wizzy( p_parent )
{
   BranchWizzy *b = new BranchWizzy();
/* snip */
}

#include "OutputWizzy.h"

#include "WizzyConnectionPoint.h"
#include <QtGui>

#include "BranchWizzy.h"
OutputWizzy::OutputWizzy( QObject *p_parent ) : Wizzy( p_parent )
{
   BranchWizzy *b = new BranchWizzy();
/* snip */
}

To copy to clipboard, switch view to plain text mode 

Here's the BranchWizzy header:

#ifndef BRANCH_WIZZY_H
#define BRANCH_WIZZY_H
 
#include "Wizzy.h"
#include <QtGui>
 
class BranchWizzy : public Wizzy
{
   Q_OBJECT
 
   public:
      BranchWizzy( QObject* = NULL );
 
   public slots:
 
   signals:
 
   protected:
 
   private:
};
 
#endif

#ifndef BRANCH_WIZZY_H
#define BRANCH_WIZZY_H

#include "Wizzy.h"
#include <QtGui>

class BranchWizzy : public Wizzy
{
   Q_OBJECT

   public:
      BranchWizzy( QObject* = NULL );

   public slots:

   signals:

   protected:

   private:
};

#endif

To copy to clipboard, switch view to plain text mode 

And BranchWizzy implementation:

#include "BranchWizzy.h"
 
#include "WizzyConnectionPoint.h"
#include <QtGui>
 
BranchWizzy::BranchWizzy( QObject *p_parent ) : Wizzy( p_parent )
{
/* snip */
}

#include "BranchWizzy.h"

#include "WizzyConnectionPoint.h"
#include <QtGui>

BranchWizzy::BranchWizzy( QObject *p_parent ) : Wizzy( p_parent )
{
/* snip */
}

To copy to clipboard, switch view to plain text mode 

Anyone see anything I'm overlooking? Thanks again!

[pastor]

Stange. I don't see anything

Can you post a minimal sources for reproducible? (I want to reproduce this on my local machine)

[chadkeck]

Thanks to pastor's comment I went ahead and started stripping out code. It came down to an Enum I had that had in the Wizzy.h had exact names of the other Wizzy classes. For example:

enum WizzyType
{
         ProcedureWizzy = 1,
         BranchWizzy = 2,
         LoopWizzy = 3,
         DatumWizzy = 4,
         InputWizzy = 5,
         OutputWizzy = 6,
         SourceWizzy = 7,
         SinkWizzy = 8,
         BaseWizzy = 0
};

enum WizzyType
{
         ProcedureWizzy = 1,
         BranchWizzy = 2,
         LoopWizzy = 3,
         DatumWizzy = 4,
         InputWizzy = 5,
         OutputWizzy = 6,
         SourceWizzy = 7,
         SinkWizzy = 8,
         BaseWizzy = 0
};

To copy to clipboard, switch view to plain text mode 

Rookie mistake, I can't believe I haven't run into it before. Too bad the compiler error message wasn't any help

Thanks for everyone's time!