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#include <QtTest/QtTest>

#include <QApplication>

#include <QDebug>

#include <QPointer>

#include <QWidget>

class tst_QPointer : public QObject

{

    Q_OBJECT

public:

    tst_QPointer();

    ~tst_QPointer();

    inline tst_QPointer *me() const

    { return const_cast<tst_QPointer *>(this); }

public slots:

    void initTestCase();

    void cleanupTestCase();

    void init();

    void cleanup();

private slots:

    void constructors();

    void destructor();

    void assignment_operators();

    void equality_operators();

    void isNull();

    void dereference_operators();

    void disconnect();

    void castDuringDestruction();

    void data() const;

    void dataSignature() const;

};

tst_QPointer::tst_QPointer()

{ }

tst_QPointer::~tst_QPointer()

{ }

void tst_QPointer::initTestCase()

{ }

void tst_QPointer::cleanupTestCase()

{ }

void tst_QPointer::init()

{ }

void tst_QPointer::cleanup()

{ }

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()

{

    QObject *object = new QObject;

    QPointer<QObject> p = object;

    QCOMPARE(p, QPointer<QObject>(object));

    delete object;

    QCOMPARE(p, QPointer<QObject>(0));

}

void tst_QPointer::assignment_operators()

{

    QPointer<QObject> p1;

    QPointer<QObject> p2;

    p1 = this;

    p2 = p1;

    QCOMPARE(p1, QPointer<QObject>(this));

    QCOMPARE(p2, QPointer<QObject>(this));

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

    p1 = 0;

    p2 = p1;

    QCOMPARE(p1, QPointer<QObject>(0));

    QCOMPARE(p2, QPointer<QObject>(0));

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

    QObject *object = new QObject;

    p1 = object;

    p2 = p1;

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

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

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

    delete object;

    QCOMPARE(p1, QPointer<QObject>(0));

    QCOMPARE(p2, QPointer<QObject>(0));

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

}

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;

    QObject *object = p1->me();

    QVERIFY(object == this);

    QObject &ref = *p1;

    QVERIFY(&ref == this);

    object = static_cast<QObject *>(p1);

    QVERIFY(object == this);

}

void tst_QPointer::disconnect()

{

    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();

    }

}

void tst_QPointer::data() const

{

    /* Check value of a default constructed object. */

    {

        QPointer<QObject> p;

        QCOMPARE(p.data(), static_cast<QObject *>(0));

    }

    /* Check value of a default constructed object. */

    {

        QObject *const object = new QObject();

        QPointer<QObject> p(object);

        QCOMPARE(p.data(), object);

    }

}

void tst_QPointer::dataSignature() const

{

    /* data() should be const. */

    {

        const QPointer<QObject> p;

        p.data();

    }

    /* The return type should be T. */

    {

        const QPointer<QWidget> p;

        /* If the types differs, the QCOMPARE will fail to instansiate. */

        QCOMPARE(p.data(), static_cast<QWidget *>(0));

    }

}

QTEST_MAIN(tst_QPointer)

#include "tst_qpointer.moc"