qt5base-lts/tests/auto/qpointer/tst_qpointer.cpp

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#include <QtTest/QtTest>

#include <QPointer>
#include <QWidget>

class tst_QPointer : public QObject
{
    Q_OBJECT
public:
    inline tst_QPointer *me() const
    { return const_cast<tst_QPointer *>(this); }

private slots:
    void constructors();
    void destructor();
    void assignment_operators();
    void equality_operators();
    void isNull();
    void dereference_operators();
    void disconnect();
    void castDuringDestruction();
    void threadSafety();
};

void tst_QPointer::constructors()
{
    QPointer<QObject> p1;
    QPointer<QObject> p2(this);
    QPointer<QObject> p3(p2);
    QCOMPARE(p1, QPointer<QObject>(0));
    QCOMPARE(p2, QPointer<QObject>(this));
    QCOMPARE(p3, QPointer<QObject>(this));
}

void tst_QPointer::destructor()
{
    // Make two QPointer's to the same object
    QObject *object = new QObject;
    QPointer<QObject> p1 = object;
    QPointer<QObject> p2 = object;
    // Check that they point to the correct object
    QCOMPARE(p1, QPointer<QObject>(object));
    QCOMPARE(p2, QPointer<QObject>(object));
    QCOMPARE(p1, p2);
    // Destroy the guarded object
    delete object;
    // Check that both pointers were zeroed
    QCOMPARE(p1, QPointer<QObject>(0));
    QCOMPARE(p2, QPointer<QObject>(0));
    QCOMPARE(p1, p2);
}

void tst_QPointer::assignment_operators()
{
    QPointer<QObject> p1;
    QPointer<QObject> p2;

    // Test assignment with a QObject-derived object pointer
    p1 = this;
    p2 = p1;
    QCOMPARE(p1, QPointer<QObject>(this));
    QCOMPARE(p2, QPointer<QObject>(this));
    QCOMPARE(p1, QPointer<QObject>(p2));

    // Test assignment with a null pointer
    p1 = 0;
    p2 = p1;
    QCOMPARE(p1, QPointer<QObject>(0));
    QCOMPARE(p2, QPointer<QObject>(0));
    QCOMPARE(p1, QPointer<QObject>(p2));

    // Test assignment with a real QObject pointer
    QObject *object = new QObject;

    p1 = object;
    p2 = p1;
    QCOMPARE(p1, QPointer<QObject>(object));
    QCOMPARE(p2, QPointer<QObject>(object));
    QCOMPARE(p1, QPointer<QObject>(p2));

    // Test assignment with the same pointer that's already guarded
    p1 = object;
    p2 = p1;
    QCOMPARE(p1, QPointer<QObject>(object));
    QCOMPARE(p2, QPointer<QObject>(object));
    QCOMPARE(p1, QPointer<QObject>(p2));

    // Cleanup
    delete object;
}

void tst_QPointer::equality_operators()
{
    QPointer<QObject> p1;
    QPointer<QObject> p2;

    QVERIFY(p1 == p2);

    QObject *object = 0;
    QWidget *widget = 0;

    p1 = object;
    QVERIFY(p1 == p2);
    QVERIFY(p1 == object);
    p2 = object;
    QVERIFY(p2 == p1);
    QVERIFY(p2 == object);

    p1 = this;
    QVERIFY(p1 != p2);
    p2 = p1;
    QVERIFY(p1 == p2);

    // compare to zero
    p1 = 0;
    QVERIFY(p1 == 0);
    QVERIFY(0 == p1);
    QVERIFY(p2 != 0);
    QVERIFY(0 != p2);
    QVERIFY(p1 == object);
    QVERIFY(object == p1);
    QVERIFY(p2 != object);
    QVERIFY(object != p2);
    QVERIFY(p1 == widget);
    QVERIFY(widget == p1);
    QVERIFY(p2 != widget);
    QVERIFY(widget != p2);
}

void tst_QPointer::isNull()
{
    QPointer<QObject> p1;
    QVERIFY(p1.isNull());
    p1 = this;
    QVERIFY(!p1.isNull());
    p1 = 0;
    QVERIFY(p1.isNull());
}

void tst_QPointer::dereference_operators()
{
    QPointer<tst_QPointer> p1 = this;
    QPointer<tst_QPointer> p2;

    // operator->() -- only makes sense if not null
    QObject *object = p1->me();
    QCOMPARE(object, this);

    // operator*() -- only makes sense if not null
    QObject &ref = *p1;
    QCOMPARE(&ref, this);

    // operator T*()
    QCOMPARE(static_cast<QObject *>(p1), this);
    QCOMPARE(static_cast<QObject *>(p2), static_cast<QObject *>(0));

    // data()
    QCOMPARE(p1.data(), this);
    QCOMPARE(p2.data(), static_cast<QObject *>(0));
}

void tst_QPointer::disconnect()
{
    // Verify that pointer remains guarded when all signals are disconencted.
    QPointer<QObject> p1 = new QObject;
    QVERIFY(!p1.isNull());
    p1->disconnect();
    QVERIFY(!p1.isNull());
    delete static_cast<QObject *>(p1);
    QVERIFY(p1.isNull());
}

class ChildObject : public QObject
{
    QPointer<QObject> guardedPointer;

public:
    ChildObject(QObject *parent)
        : QObject(parent), guardedPointer(parent)
    { }
    ~ChildObject();
};

ChildObject::~ChildObject()
{
    QCOMPARE(static_cast<QObject *>(guardedPointer), static_cast<QObject *>(0));
    QCOMPARE(qobject_cast<QObject *>(guardedPointer), static_cast<QObject *>(0));
}

class ChildWidget : public QWidget
{
    QPointer<QWidget> guardedPointer;

public:
    ChildWidget(QWidget *parent)
        : QWidget(parent), guardedPointer(parent)
    { }
    ~ChildWidget();
};

ChildWidget::~ChildWidget()
{
    QCOMPARE(static_cast<QWidget *>(guardedPointer), static_cast<QWidget *>(0));
    QCOMPARE(qobject_cast<QWidget *>(guardedPointer), static_cast<QWidget *>(0));
}

class DerivedChild;

class DerivedParent : public QObject
{
    Q_OBJECT

    DerivedChild *derivedChild;

public:
    DerivedParent();
    ~DerivedParent();
};

class DerivedChild : public QObject
{
    Q_OBJECT

    DerivedParent *parentPointer;
    QPointer<DerivedParent> guardedParentPointer;

public:
    DerivedChild(DerivedParent *parent)
        : QObject(parent), parentPointer(parent), guardedParentPointer(parent)
    { }
    ~DerivedChild();
};

DerivedParent::DerivedParent()
    : QObject()
{
    derivedChild = new DerivedChild(this);
}

DerivedParent::~DerivedParent()
{
    delete derivedChild;
}

DerivedChild::~DerivedChild()
{
    QCOMPARE(static_cast<DerivedParent *>(guardedParentPointer), parentPointer);
    QCOMPARE(qobject_cast<DerivedParent *>(guardedParentPointer), parentPointer);
}

void tst_QPointer::castDuringDestruction()
{
    {
        QObject *parentObject = new QObject();
        (void) new ChildObject(parentObject);
        delete parentObject;
    }

    {
        QWidget *parentWidget = new QWidget();
        (void) new ChildWidget(parentWidget);
        delete parentWidget;
    }

    {
        delete new DerivedParent();
    }
}

class TestRunnable : public QObject, public QRunnable {
    void run() {
        QPointer<QObject> obj1 = new QObject;
        QPointer<QObject> obj2 = new QObject;
        obj1->moveToThread(thread()); // this is the owner thread
        obj1->deleteLater(); // the delete will happen in the owner thread
        obj2->moveToThread(thread()); // this is the owner thread
        obj2->deleteLater(); // the delete will happen in the owner thread
    }
};

void tst_QPointer::threadSafety()
{

    QThread owner;
    owner.start();

    QThreadPool pool;
    for (int i = 0; i < 300; i++) {
        QPointer<TestRunnable> task = new TestRunnable;
        task->setAutoDelete(true);
        task->moveToThread(&owner);
        pool.start(task);
    }
    pool.waitForDone();

    owner.quit();
    owner.wait();
}


QTEST_MAIN(tst_QPointer)
#include "tst_qpointer.moc"