‘staticMetaObject’ is not a member

I tried to compile a code looking like this:

#ifndef CONTROLLER_H_
#define CONTROLLER_H_

#include<QObject>

class AbstractClass
{
public:
    virtual ~AbstractClass() {}
    virtual void update() = 0;
};

class Controller :
      public AbstractClass, public QObject
{
      Q_OBJECT

public:
      Controller();
      virtual ~Controller();
      virtual void update();

public slots:
      void m();
};

#endif /*CONTROLLER_H_*/

If you’re trying to compile it you get an error:

tmp/moc/moc_Controller.cpp:45: error: 'staticMetaObject' is not a member of 'AbstractClass'
tmp/moc/moc_Controller.cpp: In member function 'virtual void* Controller::qt_metacast(const char*)':
tmp/moc/moc_Controller.cpp:61: error: 'qt_metacast' is not a member of 'AbstractClass'
tmp/moc/moc_Controller.cpp: In member function 'virtual int Controller::qt_metacall(QMetaObject::Call, int, void**)':
tmp/moc/moc_Controller.cpp:66: error: 'qt_metacall' is not a member of 'AbstractClass'
make: *** [tmp/objects/moc_Controller.o] Error 1

The error is caused by a bad order of inheritance.

Instead of this

class Controller :
	public AbstractClass, public QObject
{
   ...

you should use this

class Controller :
	public QObject, public AbstractClass
{
   ...

7 Responses

Write a Comment»

Anonymous
September 17, 2009 at 9:49 am | Permalink |

Thanks! It was useful for me.
Ralf
October 18, 2009 at 5:05 pm | Permalink |

For me to Thanks a lot
baltazar
March 16, 2010 at 11:36 am | Permalink |

Useful information, thank you! I had exactly the same problem and now it’s fixed.
Delly
July 19, 2010 at 8:31 pm | Permalink |

thx a lot！=v=
Andrew
August 9, 2010 at 6:27 pm | Permalink |

thanks a lot! This was useful. Though, I don’t understand why this problem arises. What does inheritance order influence upon?
slopjong
August 9, 2010 at 7:38 pm | Permalink |

I don’t know why the compiler behaves like that. I’m not a C++ expert
nikolakoco
August 16, 2011 at 7:00 pm | Permalink |

Thank you a lot. Really useful