How to delete object on the heap when another heap object is deleted
Hi, I have the code:
- void Processmethod()
- {
- Ui::DialogProcessMessage *Dialog = new Ui::DialogProcessMessage();
- Dialog->setupUi(ProcessMessage); //polymorphy
- ProcessMessage->setModal(true);
- connect(Dialog->pushButtonAbort, SIGNAL(clicked()), &Prozess, SLOT(kill()));
- connect(this,SIGNAL(enablePushButton(bool)),Dialog->pushButtonClose, SLOT(setEnabled(bool)));
- Prozessmeldung->setModal(true);
- ProcessMessage->show();
- processmethodONE();
- }
How can I delete the heap-object Dialog best when the heap-object ProcessMessage is deleted (which is deleted when closed)? Both objects must be created on the heap. Furthermore the class “Ui::DialogProcessMessage” is directly created by the ui-file and therefore any changes in it will be deleted everytime the ui-file is changed. Is there a way to delete heap-object Dialog when the heap-object ProcessMessage is deleted without subclassing? greetings
4 replies
Since you are setting the Ui::DialogProcessMessage Dialog to be parented by ProcessMessage (via setupUi()), then ProcessMessage takes ownership of Dialog and will automatically delete it upon its own destruction. That’s the beauty of Qt’s QObject parent/child relationships.
Edit to add:
However, on a related note, if you wanted to force the deletion of two unrelated QObjects, you could do something like:
- // Assume two unrelated QObjects, object1 and object2
- // destroyed() is emitted as object1 is destructed, and would then
- // call object2's deleteLater to force it to be cleaned up immediately
- // afterwards on a subsequent eventLoop cycle.
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