QObject *o = new QObject();
QObject *o1 = new QObject();
QObject *o  = new QObject(o1);
qDebug() << o;
QSharedPointer<QObject> p(o);
delete o1;
qDebug() << p.data();

#include <QtWidgets>

class MegaWidget : public QWidget
{
public:
    MegaWidget()
    {
        QVBoxLayout *layoutMain = new QVBoxLayout();
        {
            button = new QPushButton("close if equals");
            connect(button, &QPushButton::clicked, this, &MegaWidget::closeIfEquals);
            layoutMain->addWidget(button);

            line = new QLineEdit("text");
            layoutMain->addWidget(line);
        }
        setLayout(layoutMain);
        show();
    }

    void setOther(MegaWidget *other)
    {
        this->other = other;
    }

    QString getText()
    {
        return line->text();
    }

public slots:
    void closeIfEquals()
    {
        if (line->text() == other->getText())
            delete this;
        else
            line->setText(other->getText());
    }

private:
    MegaWidget *other;

    QPushButton *button;
    QLineEdit *line;
};

int main(int argc, char** argv)
{
    QApplication app(argc, argv);

    MegaWidget* w1 = new MegaWidget();
    MegaWidget* w2 = new MegaWidget();

    w1->setOther(w2);
    w2->setOther(w1);

    return app.exec();
}