Connect call causes a SEGFAULT

[Caolan O'Domhnaill]

Hey all,

The code compiles and links w/o issue.
Here's where I make the connect() call in my MainWindow class. It happens in the initialisation code of my Main Window. I have verified that the source and target of signal and slot respectively are valid addresses and being created.

This yields the segfault

void CMainWindow::createSignalSlots() {
    connect(m_pGraphWidget, SIGNAL(createObj(QGraphicsItem *)), m_pPhysObjNavigator, SLOT(onCreateObj(QGraphicsItem *)));
}

void CMainWindow::createSignalSlots() {
    connect(m_pGraphWidget, SIGNAL(createObj(QGraphicsItem *)), m_pPhysObjNavigator, SLOT(onCreateObj(QGraphicsItem *)));
}

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m_pGraphWidget is defined by the class definition like so:

class GraphWidget : public QGraphicsView {
    Q_OBJECT
signals:
    void createObj(QGraphicsItem *);
    void removeObj(QGraphicsItem *);
    void modifyObj(QGraphicsItem *);

class GraphWidget : public QGraphicsView {
    Q_OBJECT
signals:
    void createObj(QGraphicsItem *);
    void removeObj(QGraphicsItem *);
    void modifyObj(QGraphicsItem *);

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m_pPhysObjNavigator is defined by the class definition like so:

class PhysObjectNavigator : public QTreeView {
public:
    PhysObjectNavigator(QWidget * = NULL);
 
public slots:
    void onCreateObj(QGraphicsItem *);

class PhysObjectNavigator : public QTreeView {
public:
    PhysObjectNavigator(QWidget * = NULL);

public slots:
    void onCreateObj(QGraphicsItem *);

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Code in GraphWidget that makes the emit call is here:

void GraphWidget::createCartesianGraph() {
 
    // Create the object
    m_pCartGraph = new CartesianGraph(this);
    m_pCartGraph -> setPos(0, 0);
    m_pScene -> addItem(m_pCartGraph);
    emit createObj(m_pCartGraph);
}

void GraphWidget::createCartesianGraph() {

    // Create the object
    m_pCartGraph = new CartesianGraph(this);
    m_pCartGraph -> setPos(0, 0);
    m_pScene -> addItem(m_pCartGraph);
    emit createObj(m_pCartGraph);
}

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Code that is supposed to receive the signal is:

void PhysObjectNavigator::onCreateObj(QGraphicsItem *pObj) {
    if (pObj) {
        switch (pObj -> type()) {
            case PhysBaseItem::VectorType:
                break;
            case PhysBaseItem::ParticleType:
                break;
            case PhysBaseItem::CartesianGraphType:
                break;
            default:
                break;
       }
    }
}

void PhysObjectNavigator::onCreateObj(QGraphicsItem *pObj) {
    if (pObj) {
        switch (pObj -> type()) {
            case PhysBaseItem::VectorType:
                break;
            case PhysBaseItem::ParticleType:
                break;
            case PhysBaseItem::CartesianGraphType:
                break;
            default:
                break;
       }
    }
}

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I thought it might be because PhysObjectNavigator does not have the Q_OBJECT macro defined in it but when I do put it there I get the error:
undefined reference to 'vtable for PhysObjectNavigator'
However it is derived from QTreeView which already includes Q_OBJECT so it shouldn't be a big deal.

Any ideas? It all seems set up and ready to go.