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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 898 insertions, 0 deletions

diff --git a/src/corelib/tools/qsharedpointer_impl.h b/src/corelib/tools/qsharedpointer_impl.h
new file mode 100644
index 0000000000..b29e5b69e3
--- /dev/null
+++ b/src/corelib/tools/qsharedpointer_impl.h
@@ -0,0 +1,898 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef Q_QDOC
+
+#ifndef QSHAREDPOINTER_H
+#error Do not include qsharedpointer_impl.h directly
+#endif
+
+#if 0
+// These macros are duplicated here to make syncqt not complain a about
+// this header, as we have a "qt_sync_stop_processing" below, which in turn
+// is here because this file contains a template mess and duplicates the
+// classes found in qsharedpointer.h
+QT_BEGIN_HEADER
+QT_BEGIN_NAMESPACE
+QT_MODULE(Core)
+QT_END_NAMESPACE
+QT_END_HEADER
+#pragma qt_sync_stop_processing
+#endif
+
+#include <new>
+#include <QtCore/qatomic.h>
+#include <QtCore/qobject.h>    // for qobject_cast
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Core)
+
+// Macro QSHAREDPOINTER_VERIFY_AUTO_CAST
+//  generates a compiler error if the following construct isn't valid:
+//    T *ptr1;
+//    X *ptr2 = ptr1;
+//
+#ifdef QT_NO_DEBUG
+# define QSHAREDPOINTER_VERIFY_AUTO_CAST(T, X)          qt_noop()
+#else
+
+template<typename T> inline void qt_sharedpointer_cast_check(T *) { }
+# define QSHAREDPOINTER_VERIFY_AUTO_CAST(T, X)          \
+    qt_sharedpointer_cast_check<T>(static_cast<X *>(0))
+#endif
+
+//
+// forward declarations
+//
+template <class T> class QWeakPointer;
+template <class T> class QSharedPointer;
+
+template <class X, class T>
+QSharedPointer<X> qSharedPointerCast(const QSharedPointer<T> &ptr);
+template <class X, class T>
+QSharedPointer<X> qSharedPointerDynamicCast(const QSharedPointer<T> &ptr);
+template <class X, class T>
+QSharedPointer<X> qSharedPointerConstCast(const QSharedPointer<T> &ptr);
+
+#ifndef QT_NO_QOBJECT
+template <class X, class T>
+QSharedPointer<X> qSharedPointerObjectCast(const QSharedPointer<T> &ptr);
+#endif
+
+namespace QtSharedPointer {
+    template <class T> class InternalRefCount;
+    template <class T> class ExternalRefCount;
+
+    template <class X, class Y> QSharedPointer<X> copyAndSetPointer(X * ptr, const QSharedPointer<Y> &src);
+
+    // used in debug mode to verify the reuse of pointers
+    Q_CORE_EXPORT void internalSafetyCheckAdd2(const void *, const volatile void *);
+    Q_CORE_EXPORT void internalSafetyCheckRemove2(const void *);
+
+    template <class T, typename Klass, typename RetVal>
+    inline void executeDeleter(T *t, RetVal (Klass:: *memberDeleter)())
+    { (t->*memberDeleter)(); }
+    template <class T, typename Deleter>
+    inline void executeDeleter(T *t, Deleter d)
+    { d(t); }
+    template <class T> inline void normalDeleter(T *t) { delete t; }
+
+    // this uses partial template specialization
+    template <class T> struct RemovePointer;
+    template <class T> struct RemovePointer<T *> { typedef T Type; };
+    template <class T> struct RemovePointer<QSharedPointer<T> > { typedef T Type; };
+    template <class T> struct RemovePointer<QWeakPointer<T> > { typedef T Type; };
+
+    // This class provides the basic functionality of a pointer wrapper.
+    // Its existence is mostly legacy, since originally QSharedPointer
+    // could also be used for internally-refcounted objects.
+    template <class T>
+    class Basic
+    {
+#ifndef Q_CC_NOKIAX86
+        typedef T *Basic:: *RestrictedBool;
+#endif
+    public:
+        typedef T Type;
+        typedef T element_type;
+        typedef T value_type;
+        typedef value_type *pointer;
+        typedef const value_type *const_pointer;
+        typedef value_type &reference;
+        typedef const value_type &const_reference;
+        typedef qptrdiff difference_type;
+
+        inline T *data() const { return value; }
+        inline bool isNull() const { return !data(); }
+#ifndef Q_CC_NOKIAX86
+        inline operator RestrictedBool() const { return isNull() ? 0 : &Basic::value; }
+#else
+        inline operator bool() const { return isNull() ? 0 : &Basic::value; }
+#endif
+        inline bool operator !() const { return isNull(); }
+        inline T &operator*() const { return *data(); }
+        inline T *operator->() const { return data(); }
+
+    protected:
+        inline Basic(T *ptr = 0) : value(ptr) { }
+        inline Basic(Qt::Initialization) { }
+        // ~Basic();
+
+        inline void internalConstruct(T *ptr)
+        {
+            value = ptr;
+        }
+
+#if defined(Q_NO_TEMPLATE_FRIENDS)
+    public:
+#else
+        template <class X> friend class QT_PREPEND_NAMESPACE(QWeakPointer);
+#endif
+
+        Type *value;
+    };
+
+    // This class is the d-pointer of QSharedPointer and QWeakPointer.
+    //
+    // It is a reference-counted reference counter. "strongref" is the inner
+    // reference counter, and it tracks the lifetime of the pointer itself.
+    // "weakref" is the outer reference counter and it tracks the lifetime of
+    // the ExternalRefCountData object.
+    struct ExternalRefCountData
+    {
+        QBasicAtomicInt weakref;
+        QBasicAtomicInt strongref;
+
+        inline ExternalRefCountData()
+        {
+            strongref = 1;
+            weakref = 1;
+        }
+        inline ExternalRefCountData(Qt::Initialization) { }
+        virtual inline ~ExternalRefCountData() { Q_ASSERT(!weakref); Q_ASSERT(strongref <= 0); }
+
+        // overridden by derived classes
+        // returns false to indicate caller should delete the pointer
+        // returns true in case it has already done so
+        virtual inline bool destroy() { return false; }
+
+#ifndef QT_NO_QOBJECT
+        Q_CORE_EXPORT static ExternalRefCountData *getAndRef(const QObject *);
+        Q_CORE_EXPORT void setQObjectShared(const QObject *, bool enable);
+#endif
+        inline void setQObjectShared(...) { }
+    };
+    // sizeof(ExternalRefCount) = 12 (32-bit) / 16 (64-bit)
+
+    // This class extends ExternalRefCountData with a pointer
+    // to a function, which is called by the destroy() function.
+    struct ExternalRefCountWithDestroyFn: public ExternalRefCountData
+    {
+        typedef void (*DestroyerFn)(ExternalRefCountData *);
+        DestroyerFn destroyer;
+
+        inline ExternalRefCountWithDestroyFn(DestroyerFn d)
+            : destroyer(d)
+        { }
+
+        inline bool destroy() { destroyer(this); return true; }
+        inline void operator delete(void *ptr) { ::operator delete(ptr); }
+        inline void operator delete(void *, void *) { }
+    };
+    // sizeof(ExternalRefCountWithDestroyFn) = 16 (32-bit) / 24 (64-bit)
+
+    // This class extends ExternalRefCountWithDestroyFn and implements
+    // the static function that deletes the object. The pointer and the
+    // custom deleter are kept in the "extra" member.
+    template <class T, typename Deleter>
+    struct ExternalRefCountWithCustomDeleter: public ExternalRefCountWithDestroyFn
+    {
+        typedef ExternalRefCountWithCustomDeleter Self;
+        typedef ExternalRefCountWithDestroyFn BaseClass;
+
+        struct CustomDeleter
+        {
+            Deleter deleter;
+            T *ptr;
+
+            inline CustomDeleter(T *p, Deleter d) : deleter(d), ptr(p) {}
+        };
+        CustomDeleter extra;
+        // sizeof(CustomDeleter) = sizeof(Deleter) + sizeof(void*)
+        // for Deleter = function pointer:  8 (32-bit) / 16 (64-bit)
+        // for Deleter = PMF: 12 (32-bit) / 24 (64-bit)  (GCC)
+
+        static inline void deleter(ExternalRefCountData *self)
+        {
+            Self *realself = static_cast<Self *>(self);
+            executeDeleter(realself->extra.ptr, realself->extra.deleter);
+
+            // delete the deleter too
+            realself->extra.~CustomDeleter();
+        }
+        static void safetyCheckDeleter(ExternalRefCountData *self)
+        {
+            internalSafetyCheckRemove2(self);
+            deleter(self);
+        }
+
+        static inline Self *create(T *ptr, Deleter userDeleter)
+        {
+# ifdef QT_SHAREDPOINTER_TRACK_POINTERS
+            DestroyerFn destroy = &safetyCheckDeleter;
+# else
+            DestroyerFn destroy = &deleter;
+# endif
+            Self *d = static_cast<Self *>(::operator new(sizeof(Self)));
+
+            // initialize the two sub-objects
+            new (&d->extra) CustomDeleter(ptr, userDeleter);
+            new (d) BaseClass(destroy); // can't throw
+
+            return d;
+        }
+    private:
+        // prevent construction and the emission of virtual symbols
+        ExternalRefCountWithCustomDeleter();
+        ~ExternalRefCountWithCustomDeleter();
+    };
+
+    // This class extends ExternalRefCountWithDestroyFn and adds a "T"
+    // member. That way, when the create() function is called, we allocate
+    // memory for both QSharedPointer's d-pointer and the actual object being
+    // tracked.
+    template <class T>
+    struct ExternalRefCountWithContiguousData: public ExternalRefCountWithDestroyFn
+    {
+        typedef ExternalRefCountWithDestroyFn Parent;
+        T data;
+
+        static void deleter(ExternalRefCountData *self)
+        {
+            ExternalRefCountWithContiguousData *that =
+                    static_cast<ExternalRefCountWithContiguousData *>(self);
+            that->data.~T();
+        }
+        static void safetyCheckDeleter(ExternalRefCountData *self)
+        {
+            internalSafetyCheckRemove2(self);
+            deleter(self);
+        }
+
+        static inline ExternalRefCountData *create(T **ptr)
+        {
+# ifdef QT_SHAREDPOINTER_TRACK_POINTERS
+            DestroyerFn destroy = &safetyCheckDeleter;
+# else
+            DestroyerFn destroy = &deleter;
+# endif
+            ExternalRefCountWithContiguousData *d =
+                static_cast<ExternalRefCountWithContiguousData *>(::operator new(sizeof(ExternalRefCountWithContiguousData)));
+
+            // initialize the d-pointer sub-object
+            // leave d->data uninitialized
+            new (d) Parent(destroy); // can't throw
+
+            *ptr = &d->data;
+            return d;
+        }
+
+    private:
+        // prevent construction and the emission of virtual symbols
+        ExternalRefCountWithContiguousData();
+        ~ExternalRefCountWithContiguousData();
+    };
+
+    // This is the main body of QSharedPointer. It implements the
+    // external reference counting functionality.
+    template <class T>
+    class ExternalRefCount: public Basic<T>
+    {
+    protected:
+        typedef ExternalRefCountData Data;
+
+        inline void deref()
+        { deref(d, this->value); }
+        static inline void deref(Data *d, T *value)
+        {
+            if (!d) return;
+            if (!d->strongref.deref()) {
+                if (!d->destroy())
+                    delete value;
+            }
+            if (!d->weakref.deref())
+                delete d;
+        }
+
+        inline void internalConstruct(T *ptr)
+        {
+#ifdef QT_SHAREDPOINTER_TRACK_POINTERS
+            internalConstruct<void (*)(T *)>(ptr, normalDeleter);
+#else
+            if (ptr)
+                d = new Data;
+            else
+                d = 0;
+            internalFinishConstruction(ptr);
+#endif
+        }
+
+        template <typename Deleter>
+        inline void internalConstruct(T *ptr, Deleter deleter)
+        {
+            if (ptr)
+                d = ExternalRefCountWithCustomDeleter<T, Deleter>::create(ptr, deleter);
+            else
+                d = 0;
+            internalFinishConstruction(ptr);
+        }
+
+        inline void internalCreate()
+        {
+            T *ptr;
+            d = ExternalRefCountWithContiguousData<T>::create(&ptr);
+            Basic<T>::internalConstruct(ptr);
+        }
+
+        inline void internalFinishConstruction(T *ptr)
+        {
+            Basic<T>::internalConstruct(ptr);
+            if (ptr) d->setQObjectShared(ptr, true);
+#ifdef QT_SHAREDPOINTER_TRACK_POINTERS
+            if (ptr) internalSafetyCheckAdd2(d, ptr);
+#endif
+        }
+
+        inline ExternalRefCount() : d(0) { }
+        inline ExternalRefCount(Qt::Initialization i) : Basic<T>(i) { }
+
+        inline ExternalRefCount(T *ptr) : Basic<T>(Qt::Uninitialized) // throws
+        { internalConstruct(ptr); }
+        template <typename Deleter>
+        inline ExternalRefCount(T *ptr, Deleter deleter) : Basic<T>(Qt::Uninitialized) // throws
+        { internalConstruct(ptr, deleter); }
+
+        inline ExternalRefCount(const ExternalRefCount<T> &other) : Basic<T>(other), d(other.d)
+        { if (d) ref(); }
+        template <class X>
+        inline ExternalRefCount(const ExternalRefCount<X> &other) : Basic<T>(other.value), d(other.d)
+        { if (d) ref(); }
+        inline ~ExternalRefCount() { deref(); }
+
+        template <class X>
+        inline void internalCopy(const ExternalRefCount<X> &other)
+        {
+            Data *o = other.d;
+            T *actual = other.value;
+            if (o)
+                other.ref();
+            qSwap(d, o);
+            qSwap(this->value, actual);
+            deref(o, actual);
+        }
+
+        inline void internalSwap(ExternalRefCount &other)
+        {
+            qSwap(d, other.d);
+            qSwap(this->value, other.value);
+        }
+
+#if defined(Q_NO_TEMPLATE_FRIENDS)
+    public:
+#else
+        template <class X> friend class ExternalRefCount;
+        template <class X> friend class QT_PREPEND_NAMESPACE(QWeakPointer);
+        template <class X, class Y> friend QSharedPointer<X> copyAndSetPointer(X * ptr, const QSharedPointer<Y> &src);
+#endif
+        inline void ref() const { d->weakref.ref(); d->strongref.ref(); }
+
+        inline void internalSet(Data *o, T *actual)
+        {
+            if (o) {
+                // increase the strongref, but never up from zero
+                // or less (-1 is used by QWeakPointer on untracked QObject)
+                register int tmp = o->strongref;
+                while (tmp > 0) {
+                    // try to increment from "tmp" to "tmp + 1"
+                    if (o->strongref.testAndSetRelaxed(tmp, tmp + 1))
+                        break;   // succeeded
+                    tmp = o->strongref;  // failed, try again
+                }
+
+                if (tmp > 0)
+                    o->weakref.ref();
+                else
+                    o = 0;
+            }
+
+            qSwap(d, o);
+            qSwap(this->value, actual);
+            if (!d || d->strongref == 0)
+                this->value = 0;
+
+            // dereference saved data
+            deref(o, actual);
+        }
+
+        Data *d;
+
+    private:
+        template<class X> ExternalRefCount(const InternalRefCount<X> &);
+    };
+} // namespace QtSharedPointer
+
+template <class T>
+class QSharedPointer: public QtSharedPointer::ExternalRefCount<T>
+{
+    typedef typename QtSharedPointer::ExternalRefCount<T> BaseClass;
+public:
+    inline QSharedPointer() { }
+    // inline ~QSharedPointer() { }
+
+    inline explicit QSharedPointer(T *ptr) : BaseClass(ptr) // throws
+    { }
+
+    template <typename Deleter>
+    inline QSharedPointer(T *ptr, Deleter d) : BaseClass(ptr, d) // throws
+    { }
+
+    inline QSharedPointer(const QSharedPointer<T> &other) : BaseClass(other) { }
+    inline QSharedPointer<T> &operator=(const QSharedPointer<T> &other)
+    {
+        BaseClass::internalCopy(other);
+        return *this;
+    }
+#ifdef Q_COMPILER_RVALUE_REFS
+    inline QSharedPointer<T> &operator=(QSharedPointer<T> &&other)
+    {
+        QSharedPointer<T>::internalSwap(other);
+        return *this;
+    }
+#endif
+
+    template <class X>
+    inline QSharedPointer(const QSharedPointer<X> &other) : BaseClass(other)
+    { }
+
+    template <class X>
+    inline QSharedPointer<T> &operator=(const QSharedPointer<X> &other)
+    {
+        QSHAREDPOINTER_VERIFY_AUTO_CAST(T, X); // if you get an error in this line, the cast is invalid
+        BaseClass::internalCopy(other);
+        return *this;
+    }
+
+    template <class X>
+    inline QSharedPointer(const QWeakPointer<X> &other) : BaseClass(Qt::Uninitialized)
+    { this->d = 0; *this = other; }
+
+    template <class X>
+    inline QSharedPointer<T> &operator=(const QWeakPointer<X> &other)
+    { BaseClass::internalSet(other.d, other.value); return *this; }
+
+    inline void swap(QSharedPointer &other)
+    { QSharedPointer<T>::internalSwap(other); }
+
+    template <class X>
+    QSharedPointer<X> staticCast() const
+    {
+        return qSharedPointerCast<X, T>(*this);
+    }
+
+    template <class X>
+    QSharedPointer<X> dynamicCast() const
+    {
+        return qSharedPointerDynamicCast<X, T>(*this);
+    }
+
+    template <class X>
+    QSharedPointer<X> constCast() const
+    {
+        return qSharedPointerConstCast<X, T>(*this);
+    }
+
+#ifndef QT_NO_QOBJECT
+    template <class X>
+    QSharedPointer<X> objectCast() const
+    {
+        return qSharedPointerObjectCast<X, T>(*this);
+    }
+#endif
+
+    inline void clear() { *this = QSharedPointer<T>(); }
+
+    QWeakPointer<T> toWeakRef() const;
+
+protected:
+    inline explicit QSharedPointer(Qt::Initialization i) : BaseClass(i) {}
+
+public:
+    static inline QSharedPointer<T> create()
+    {
+        QSharedPointer<T> result(Qt::Uninitialized);
+        result.internalCreate();
+
+        // now initialize the data
+        new (result.data()) T();
+        result.internalFinishConstruction(result.data());
+        return result;
+    }
+};
+
+template <class T>
+class QWeakPointer
+{
+#ifndef Q_CC_NOKIAX86
+    typedef T *QWeakPointer:: *RestrictedBool;
+#endif
+    typedef QtSharedPointer::ExternalRefCountData Data;
+
+public:
+    typedef T element_type;
+    typedef T value_type;
+    typedef value_type *pointer;
+    typedef const value_type *const_pointer;
+    typedef value_type &reference;
+    typedef const value_type &const_reference;
+    typedef qptrdiff difference_type;
+
+    inline bool isNull() const { return d == 0 || d->strongref == 0 || value == 0; }
+#ifndef Q_CC_NOKIAX86
+    inline operator RestrictedBool() const { return isNull() ? 0 : &QWeakPointer::value; }
+#else
+    inline operator bool() const { return isNull() ? 0 : &QWeakPointer::value; }
+#endif
+    inline bool operator !() const { return isNull(); }
+    inline T *data() const { return d == 0 || d->strongref == 0 ? 0 : value; }
+
+    inline QWeakPointer() : d(0), value(0) { }
+    inline ~QWeakPointer() { if (d && !d->weakref.deref()) delete d; }
+
+#ifndef QT_NO_QOBJECT
+    // special constructor that is enabled only if X derives from QObject
+    template <class X>
+    inline QWeakPointer(X *ptr) : d(ptr ? d->getAndRef(ptr) : 0), value(ptr)
+    { }
+#endif
+    template <class X>
+    inline QWeakPointer &operator=(X *ptr)
+    { return *this = QWeakPointer(ptr); }
+
+    inline QWeakPointer(const QWeakPointer<T> &o) : d(o.d), value(o.value)
+    { if (d) d->weakref.ref(); }
+    inline QWeakPointer<T> &operator=(const QWeakPointer<T> &o)
+    {
+        internalSet(o.d, o.value);
+        return *this;
+    }
+
+    inline QWeakPointer(const QSharedPointer<T> &o) : d(o.d), value(o.data())
+    { if (d) d->weakref.ref();}
+    inline QWeakPointer<T> &operator=(const QSharedPointer<T> &o)
+    {
+        internalSet(o.d, o.value);
+        return *this;
+    }
+
+    template <class X>
+    inline QWeakPointer(const QWeakPointer<X> &o) : d(0), value(0)
+    { *this = o; }
+
+    template <class X>
+    inline QWeakPointer<T> &operator=(const QWeakPointer<X> &o)
+    {
+        // conversion between X and T could require access to the virtual table
+        // so force the operation to go through QSharedPointer
+        *this = o.toStrongRef();
+        return *this;
+    }
+
+    template <class X>
+    inline bool operator==(const QWeakPointer<X> &o) const
+    { return d == o.d && value == static_cast<const T *>(o.value); }
+
+    template <class X>
+    inline bool operator!=(const QWeakPointer<X> &o) const
+    { return !(*this == o); }
+
+    template <class X>
+    inline QWeakPointer(const QSharedPointer<X> &o) : d(0), value(0)
+    { *this = o; }
+
+    template <class X>
+    inline QWeakPointer<T> &operator=(const QSharedPointer<X> &o)
+    {
+        QSHAREDPOINTER_VERIFY_AUTO_CAST(T, X); // if you get an error in this line, the cast is invalid
+        internalSet(o.d, o.data());
+        return *this;
+    }
+
+    template <class X>
+    inline bool operator==(const QSharedPointer<X> &o) const
+    { return d == o.d; }
+
+    template <class X>
+    inline bool operator!=(const QSharedPointer<X> &o) const
+    { return !(*this == o); }
+
+    inline void clear() { *this = QWeakPointer<T>(); }
+
+    inline QSharedPointer<T> toStrongRef() const { return QSharedPointer<T>(*this); }
+
+#if defined(QWEAKPOINTER_ENABLE_ARROW)
+    inline T *operator->() const { return data(); }
+#endif
+
+private:
+
+#if defined(Q_NO_TEMPLATE_FRIENDS)
+public:
+#else
+    template <class X> friend class QSharedPointer;
+#endif
+
+    inline void internalSet(Data *o, T *actual)
+    {
+        if (d == o) return;
+        if (o)
+            o->weakref.ref();
+        if (d && !d->weakref.deref())
+            delete d;
+        d = o;
+        value = actual;
+    }
+
+    Data *d;
+    T *value;
+};
+
+//
+// operator== and operator!=
+//
+template <class T, class X>
+bool operator==(const QSharedPointer<T> &ptr1, const QSharedPointer<X> &ptr2)
+{
+    return ptr1.data() == ptr2.data();
+}
+template <class T, class X>
+bool operator!=(const QSharedPointer<T> &ptr1, const QSharedPointer<X> &ptr2)
+{
+    return ptr1.data() != ptr2.data();
+}
+
+template <class T, class X>
+bool operator==(const QSharedPointer<T> &ptr1, const X *ptr2)
+{
+    return ptr1.data() == ptr2;
+}
+template <class T, class X>
+bool operator==(const T *ptr1, const QSharedPointer<X> &ptr2)
+{
+    return ptr1 == ptr2.data();
+}
+template <class T, class X>
+bool operator!=(const QSharedPointer<T> &ptr1, const X *ptr2)
+{
+    return !(ptr1 == ptr2);
+}
+template <class T, class X>
+bool operator!=(const T *ptr1, const QSharedPointer<X> &ptr2)
+{
+    return !(ptr2 == ptr1);
+}
+
+template <class T, class X>
+bool operator==(const QSharedPointer<T> &ptr1, const QWeakPointer<X> &ptr2)
+{
+    return ptr2 == ptr1;
+}
+template <class T, class X>
+bool operator!=(const QSharedPointer<T> &ptr1, const QWeakPointer<X> &ptr2)
+{
+    return ptr2 != ptr1;
+}
+
+//
+// operator-
+//
+template <class T, class X>
+Q_INLINE_TEMPLATE typename QSharedPointer<T>::difference_type operator-(const QSharedPointer<T> &ptr1, const QSharedPointer<X> &ptr2)
+{
+    return ptr1.data() - ptr2.data();
+}
+template <class T, class X>
+Q_INLINE_TEMPLATE typename QSharedPointer<T>::difference_type operator-(const QSharedPointer<T> &ptr1, X *ptr2)
+{
+    return ptr1.data() - ptr2;
+}
+template <class T, class X>
+Q_INLINE_TEMPLATE typename QSharedPointer<X>::difference_type operator-(T *ptr1, const QSharedPointer<X> &ptr2)
+{
+    return ptr1 - ptr2.data();
+}
+
+//
+// operator<
+//
+template <class T, class X>
+Q_INLINE_TEMPLATE bool operator<(const QSharedPointer<T> &ptr1, const QSharedPointer<X> &ptr2)
+{
+    return ptr1.data() < ptr2.data();
+}
+template <class T, class X>
+Q_INLINE_TEMPLATE bool operator<(const QSharedPointer<T> &ptr1, X *ptr2)
+{
+    return ptr1.data() < ptr2;
+}
+template <class T, class X>
+Q_INLINE_TEMPLATE bool operator<(T *ptr1, const QSharedPointer<X> &ptr2)
+{
+    return ptr1 < ptr2.data();
+}
+
+//
+// qHash
+//
+template <class T> inline uint qHash(const T *key); // defined in qhash.h
+template <class T>
+Q_INLINE_TEMPLATE uint qHash(const QSharedPointer<T> &ptr)
+{
+    return QT_PREPEND_NAMESPACE(qHash)<T>(ptr.data());
+}
+
+
+template <class T>
+Q_INLINE_TEMPLATE QWeakPointer<T> QSharedPointer<T>::toWeakRef() const
+{
+    return QWeakPointer<T>(*this);
+}
+
+template <class T>
+inline void qSwap(QSharedPointer<T> &p1, QSharedPointer<T> &p2)
+{
+    p1.swap(p2);
+}
+
+#ifndef QT_NO_STL
+QT_END_NAMESPACE
+namespace std {
+    template <class T>
+    inline void swap(QT_PREPEND_NAMESPACE(QSharedPointer)<T> &p1, QT_PREPEND_NAMESPACE(QSharedPointer)<T> &p2)
+    { p1.swap(p2); }
+}
+QT_BEGIN_NAMESPACE
+#endif
+
+namespace QtSharedPointer {
+// helper functions:
+    template <class X, class T>
+    Q_INLINE_TEMPLATE QSharedPointer<X> copyAndSetPointer(X *ptr, const QSharedPointer<T> &src)
+    {
+        QSharedPointer<X> result;
+        result.internalSet(src.d, ptr);
+        return result;
+    }
+}
+
+// cast operators
+template <class X, class T>
+Q_INLINE_TEMPLATE QSharedPointer<X> qSharedPointerCast(const QSharedPointer<T> &src)
+{
+    register X *ptr = static_cast<X *>(src.data()); // if you get an error in this line, the cast is invalid
+    return QtSharedPointer::copyAndSetPointer(ptr, src);
+}
+template <class X, class T>
+Q_INLINE_TEMPLATE QSharedPointer<X> qSharedPointerCast(const QWeakPointer<T> &src)
+{
+    return qSharedPointerCast<X, T>(src.toStrongRef());
+}
+
+template <class X, class T>
+Q_INLINE_TEMPLATE QSharedPointer<X> qSharedPointerDynamicCast(const QSharedPointer<T> &src)
+{
+    register X *ptr = dynamic_cast<X *>(src.data()); // if you get an error in this line, the cast is invalid
+    return QtSharedPointer::copyAndSetPointer(ptr, src);
+}
+template <class X, class T>
+Q_INLINE_TEMPLATE QSharedPointer<X> qSharedPointerDynamicCast(const QWeakPointer<T> &src)
+{
+    return qSharedPointerDynamicCast<X, T>(src.toStrongRef());
+}
+
+template <class X, class T>
+Q_INLINE_TEMPLATE QSharedPointer<X> qSharedPointerConstCast(const QSharedPointer<T> &src)
+{
+    register X *ptr = const_cast<X *>(src.data()); // if you get an error in this line, the cast is invalid
+    return QtSharedPointer::copyAndSetPointer(ptr, src);
+}
+template <class X, class T>
+Q_INLINE_TEMPLATE QSharedPointer<X> qSharedPointerConstCast(const QWeakPointer<T> &src)
+{
+    return qSharedPointerConstCast<X, T>(src.toStrongRef());
+}
+
+template <class X, class T>
+Q_INLINE_TEMPLATE
+QWeakPointer<X> qWeakPointerCast(const QSharedPointer<T> &src)
+{
+    return qSharedPointerCast<X, T>(src).toWeakRef();
+}
+
+#ifndef QT_NO_QOBJECT
+template <class X, class T>
+Q_INLINE_TEMPLATE QSharedPointer<X> qSharedPointerObjectCast(const QSharedPointer<T> &src)
+{
+    register X *ptr = qobject_cast<X *>(src.data());
+    return QtSharedPointer::copyAndSetPointer(ptr, src);
+}
+template <class X, class T>
+Q_INLINE_TEMPLATE QSharedPointer<X> qSharedPointerObjectCast(const QWeakPointer<T> &src)
+{
+    return qSharedPointerObjectCast<X>(src.toStrongRef());
+}
+
+template <class X, class T>
+inline QSharedPointer<typename QtSharedPointer::RemovePointer<X>::Type>
+qobject_cast(const QSharedPointer<T> &src)
+{
+    return qSharedPointerObjectCast<typename QtSharedPointer::RemovePointer<X>::Type, T>(src);
+}
+template <class X, class T>
+inline QSharedPointer<typename QtSharedPointer::RemovePointer<X>::Type>
+qobject_cast(const QWeakPointer<T> &src)
+{
+    return qSharedPointerObjectCast<typename QtSharedPointer::RemovePointer<X>::Type, T>(src);
+}
+#endif
+
+
+template<typename T> Q_DECLARE_TYPEINFO_BODY(QWeakPointer<T>, Q_MOVABLE_TYPE);
+template<typename T> Q_DECLARE_TYPEINFO_BODY(QSharedPointer<T>, Q_MOVABLE_TYPE);
+
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif