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#include <QtTest/QtTest>

#include <QtCore/QSharedData>

/*!

 \class tst_QExplicitlySharedDataPointer

 \internal

 \since 4.4

 \brief Tests class QExplicitlySharedDataPointer.

 */

class tst_QExplicitlySharedDataPointer : public QObject

{

    Q_OBJECT

private Q_SLOTS:

    void pointerOperatorOnConst() const;

    void pointerOperatorOnMutable() const;

    void copyConstructor() const;

    void clone() const;

    void data() const;

    void reset() const;

    void swap() const;

};

class MyClass : public QSharedData

{

public:

    void mutating()

    {

    }

    void notMutating() const

    {

    }

    MyClass &operator=(const MyClass &)

    {

        return *this;

    }

};

class Base : public QSharedData

{

public:

    virtual ~Base() { }

    virtual Base *clone() { return new Base(*this); }

    virtual bool isBase() const { return true; }

};

class Derived : public Base

{

public:

    virtual Base *clone() { return new Derived(*this); }

    virtual bool isBase() const { return false; }

};

QT_BEGIN_NAMESPACE

template<> Base *QExplicitlySharedDataPointer<Base>::clone()

{

    return d->clone();

}

QT_END_NAMESPACE

void tst_QExplicitlySharedDataPointer::pointerOperatorOnConst() const

{

    /* Pointer itself is const. */

    {

        const QExplicitlySharedDataPointer<const MyClass> pointer(new MyClass());

        pointer->notMutating();

    }

    /* Pointer itself is mutable. */

    {

        QExplicitlySharedDataPointer<const MyClass> pointer(new MyClass());

        pointer->notMutating();

    }

}

void tst_QExplicitlySharedDataPointer::pointerOperatorOnMutable() const

{

    /* Pointer itself is const. */

    {

        const QExplicitlySharedDataPointer<MyClass> pointer(new MyClass());

        pointer->notMutating();

        pointer->mutating();

        *pointer = MyClass();

    }

    /* Pointer itself is mutable. */

    {

        const QExplicitlySharedDataPointer<MyClass> pointer(new MyClass());

        pointer->notMutating();

        pointer->mutating();

        *pointer = MyClass();

    }

}

void tst_QExplicitlySharedDataPointer::copyConstructor() const

{

    const QExplicitlySharedDataPointer<const MyClass> pointer(new MyClass());

    const QExplicitlySharedDataPointer<const MyClass> copy(pointer);

}

void tst_QExplicitlySharedDataPointer::clone() const

{

    /* holding a base element */

    {

        QExplicitlySharedDataPointer<Base> pointer(new Base);

        QVERIFY(pointer->isBase());

        QExplicitlySharedDataPointer<Base> copy(pointer);

        pointer.detach();

        QVERIFY(pointer->isBase());

    }

    /* holding a derived element */

    {

        QExplicitlySharedDataPointer<Base> pointer(new Derived);

        QVERIFY(!pointer->isBase());

        QExplicitlySharedDataPointer<Base> copy(pointer);

        pointer.detach();

        QVERIFY(!pointer->isBase());

    }

}

void tst_QExplicitlySharedDataPointer::data() const

{

    /* Check default value. */

    {

        QExplicitlySharedDataPointer<const MyClass> pointer;

        QCOMPARE(pointer.data(), static_cast<const MyClass *>(0));

    }

    /* On const pointer. Must not mutate the pointer. */

    {

        const QExplicitlySharedDataPointer<const MyClass> pointer(new MyClass());

        pointer.data();

        /* Check that this cast is possible. */

        static_cast<const MyClass *>(pointer.data());

    }

    /* On mutatable pointer. Must not mutate the pointer. */

    {

        QExplicitlySharedDataPointer<const MyClass> pointer(new MyClass());

        pointer.data();

        /* Check that this cast is possible. */

        static_cast<const MyClass *>(pointer.data());

    }

    /* Must not mutate the pointer. */

    {

        const QExplicitlySharedDataPointer<MyClass> pointer(new MyClass());

        pointer.data();

        /* Check that these casts are possible. */

        static_cast<MyClass *>(pointer.data());

        static_cast<const MyClass *>(pointer.data());

    }

    /* Must not mutate the pointer. */

    {

        QExplicitlySharedDataPointer<MyClass> pointer(new MyClass());

        pointer.data();

        /* Check that these casts are possible. */

        static_cast<MyClass *>(pointer.data());

        static_cast<const MyClass *>(pointer.data());

    }

}

void tst_QExplicitlySharedDataPointer::reset() const

{

    /* Do reset on a single ref count. */

    {

        QExplicitlySharedDataPointer<MyClass> pointer(new MyClass());

        QVERIFY(pointer.data() != 0);

        pointer.reset();

        QCOMPARE(pointer.data(), static_cast<MyClass *>(0));

    }

    /* Do reset on a default constructed object. */

    {

        QExplicitlySharedDataPointer<MyClass> pointer;

        QCOMPARE(pointer.data(), static_cast<MyClass *>(0));

        pointer.reset();

        QCOMPARE(pointer.data(), static_cast<MyClass *>(0));

    }

}

void tst_QExplicitlySharedDataPointer::swap() const

{

    QExplicitlySharedDataPointer<MyClass> p1(0), p2(new MyClass());

    QVERIFY(!p1.data());

    QVERIFY(p2.data());

    p1.swap(p2);

    QVERIFY(p1.data());

    QVERIFY(!p2.data());

    p1.swap(p2);

    QVERIFY(!p1.data());

    QVERIFY(p2.data());

    qSwap(p1, p2);

    QVERIFY(p1.data());

    QVERIFY(!p2.data());

}

QTEST_MAIN(tst_QExplicitlySharedDataPointer)

#include "tst_qexplicitlyshareddatapointer.moc"

// vim: et:ts=4:sw=4:sts=4