#include <QPointer>
#include <QTimer>
#include <QEventLoop>
#include <QCoreApplication>
#include <QDebug>

class tst_DeferredDelete: public QObject
{
    Q_OBJECT
private slots:
    void deferredDeletion();
};

void tst_DeferredDelete::deferredDeletion()
{
    QObject *obj = new QObject;
    QPointer<QObject> ptr = obj;
    qDebug() << !ptr.isNull();

    obj->deleteLater();
    qDebug() << !ptr.isNull();

    QEventLoop loop;
    QTimer::singleShot(100, &loop, SLOT(quit()));
    loop.exec();

    qDebug() << !ptr.isNull();
}

int main(int argc, char **argv)
{
    QCoreApplication app(argc, argv);
    tst_DeferredDelete tst;
    QTimer::singleShot(0, &tst, SLOT(deferredDeletion()));

    app.exec();
}

#include "tst_deferreddelete.moc"

$ ./deferredtest
true
true
true