Check has created with new

[wirasto]

Thanks for your replay. But, how delete that object. I modified your code sample...

void doExec() {
        tahede()->exec();
    }
 
    void doDelete() {
        delete _tahede;
    }
 
protected:
    void changeEvent(QEvent *e);
 
    Tahede* tahede() {
        if(!_tahede)
        {
            _tahede = new Tahede(this);
 
            qDebug() << "Create now";
        }
        else
        {
            qDebug() << "Created before";
        }
        return _tahede;
    }
 
private:
    Tahede* _tahede;

void doExec() {
        tahede()->exec();
    }

    void doDelete() {
        delete _tahede;
    }

protected:
    void changeEvent(QEvent *e);

    Tahede* tahede() {
        if(!_tahede)
        {
            _tahede = new Tahede(this);

            qDebug() << "Create now";
        }
        else
        {
            qDebug() << "Created before";
        }
        return _tahede;
    }

private:
    Tahede* _tahede;

To copy to clipboard, switch view to plain text mode 

void Dialog::on_pushButton_clicked()
{
    doExec();
}
 
void Dialog::on_pushButton_2_clicked()
{
    doDelete();
}

void Dialog::on_pushButton_clicked()
{
    doExec();
}

void Dialog::on_pushButton_2_clicked()
{
    doDelete();
}

To copy to clipboard, switch view to plain text mode 

After I deleted with doDelete() function, and doExec() again, Application output still give me message "Created before" and my application crash What's wrong ?