VTABLE - issue

Hello forum,

i believe this issue is already discussed here. But i could not figure out any reason of the following error related to vtable:

Code:

---

../../Build/H3DSceneEditor/Debug/H3DSceneHierarchy.o: In function `~H3DSceneHierarchy':
/home/sajjad/Documents/H3DFunctionalSoFar/H3D/src/H3DSceneEditor/H3DSceneHierarchy.cpp:19: undefined reference to `vtable for H3DSceneHierarchy'
/home/sajjad/Documents/H3DFunctionalSoFar/H3D/src/H3DSceneEditor/H3DSceneHierarchy.cpp:19: undefined reference to `vtable for H3DSceneHierarchy'
/home/sajjad/Documents/H3DFunctionalSoFar/H3D/src/H3DSceneEditor/H3DSceneHierarchy.cpp:19: undefined reference to `vtable for H3DSceneHierarchy'
../../Build/H3DSceneEditor/Debug/H3DSceneHierarchy.o: In function `H3DSceneHierarchy':
/home/sajjad/Documents/H3DFunctionalSoFar/H3D/src/H3DSceneEditor/H3DSceneHierarchy.cpp:13: undefined reference to `vtable for H3DSceneHierarchy'
/home/sajjad/Documents/H3DFunctionalSoFar/H3D/src/H3DSceneEditor/H3DSceneHierarchy.cpp:13: undefined reference to `vtable for H3DSceneHierarchy'
collect2: ld returned 1 exit status
make[2]: *** [../../bin/H3Dd] Error 1
make[2]: Leaving directory `/home/sajjad/Documents/H3DFunctionalSoFar/H3D/src/H3DSceneEditor'
make[1]: *** [sub-H3DSceneEditor-make_default-ordered] Error 2

---

Code:

---

class H3DSceneHierarchy : public  QObject
{
    Q_OBJECT
public:
 
    H3DSceneHierarchy(QObject *parent = 0);
 
    ~H3DSceneHierarchy();
 
}

---

[CODE]


And in the source file

Code:

---

H3DSceneHierarchy::H3DSceneHierarchy(QObject *parent)
    : QObject(parent)
{
 
}
 
 
H3DSceneHierarchy::~H3DSceneHierarchy()
{
 
}

---

Is there anything wrong in the above code ?


Regards
Sajjad

First of all I think you are missing a semicolon after class declaration, then make sure you have header and source file for the class and correct include.

You could also write which are the error lines. Cause I can't see what line number refers to.

Semicolon after class declaration is missing, nothing more wrong with this I think.

---
edit: too slow ;)
btw. line 19:

Quote:

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H3DSceneHierarchy.cpp:19: undefined reference to `vtable for H3DSceneHierarchy'

---

If you keep getting this error after adding the semicolon, make sure moc is generated for this header ( add it to HEADERS list in .pro file, or run moc yourself )

Also, do a 'make clean' followed by a new run of 'qmake' and 'make'. Fouled vtables are often caused by failure to invoke qmake, which generates Qt's metacode, and by failure to clean a build, which causes mismatched source code components to be compiled together.

Thanks for such a quick reply!!


1. I included the semicolon that i missed.

2. Ran "make clean && make"


And unfortunately the same error . I have also checked the .pro file here i already have the header and source file defined.


Any other hint to resolve this?

Code:

---

#ifndef H3DSCENEHIERARCHY_H
#define H3DSCENEHIERARCHY_H
 
#include <iostream>
#include <vector>
 
#include <QObject>
#include <QString>
 
//#include "H3DSceneHierarchyObserver.h"
 
class H3DNodeData;
class H3DRouteLink;
class H3DProperty;
 
//!H3DSceneHierarchy is alike the ProcessorNetwork in the Voreen API
class H3DSceneHierarchy : public  QObject /* Observable<H3DSceneHierarchyObserver> */
{
    Q_OBJECT
public:
 
    H3DSceneHierarchy(QObject *parent = 0);
 
    ~H3DSceneHierarchy();
 
private:
 
 
 
    //store the list of nodes in the scene hierarchy
    //which has been dragged into the editor
    std::vector<H3DNodeData*> m_nodeList;
 
 
    //!store the list of routing links in the scene hierarchy
    std::vector<H3DRouteLink*> m_routeLinkList;
 
 
 
};
 
#endif // H3DSCENEHIERARCHY_H

---

The separate .cpp file contanis the following:

Code:

---

#include "H3DSceneHierarchy.h"
#include "H3DNodeData.h"
 
 
#include "H3DRouteLink.h"
#include "H3DProperty.h"
 
 
#include <algorithm>
 
 
H3DSceneHierarchy::H3DSceneHierarchy(QObject *parent)
    : QObject(parent)
{
 
}
 
 
H3DSceneHierarchy::~H3DSceneHierarchy()
{
    /*!
      * remove all the nodes, hierarchy and route connections from the scene
      * hierarchy and deletes them
      */
    //clear();
}

---

Regards
Sajjadul

Since you are using Q_OBJECT, have you run qmake?

did you run qmake?

I am using QtCreator to edit the project.


I just closed it down and started again. And now it works!!!


Thanks all of you.


Any explanation of it?


Regards
Sajjad

What's the OS are you using?

Make sure all methods defined in the header (Especially the slots and signals as they are Q_OBJECT and Qmake specific) have an implementation in your source file. If you do not implement a method that is Q_OBJECT specific (ie. signals and slots) you will get this error.

Ubuntu 8.10

Should it be a reason?

I guess not, but if I remember correctly something like that happened to me before, so next time it happens I want to know if that is just system related. Unfortunately I have no idea what system I used cause I do programming on OS X, Vista, Kubuntu simultaneously...

The reason is you didn't run qmake as a number of people already pointed out.