Question

I get this error in my smtdplugin implementation file , when i try to return value. OK so i understand that i’m creating a pointer to an QAction , and when i try to return it , i can not do that because my method is waiting a reference to an object. But i dont know how to act (i’m a begginer)
How to avoid this issue ? , and with success to return that object

#include "smtdplugin.h"

QAction SmtdPlugin::newItem() {

QAction *item = new QAction(NULL);

    return item; // here i get error
}

Q_EXPORT_PLUGIN2(smtdplugin,SmtdPlugin);

Header file :

#ifndef SMTDPLUGIN_H
#define SMTDPLUGIN_H

#include <QObject>
#include <QAction>
#include "smtdinterface.h"

class SmtdPlugin : public QObject,SmtdInterface  {

    Q_OBJECT
    Q_INTERFACES (SmtdInterface)

public :
    QAction newItem();

};

#endif // SMTDPLUGIN_H

Interface class :

#ifndef SMTDINTERFACE_H
#define SMTDONINTERFACE_H

#include <QAction>

class SmtdInterface {

public:
    virtual ~SmtdInterface() {}
    SmtdInterface();
    virtual QAction newItem () = 0;

};

Q_DECLARE_INTERFACE(SmtdInterface,"com.trololo.Plugin.SmtdInterface/1.0")

#endif 

Answer 1

When you do return item, you are returning a pointer to QAction, but according to the function’s declaration you return a QAction, hence the error.

So, you should do:

QAction* SmtdPlugin::newItem() {

    QAction *item = new QAction(NULL);

    return item;
}