/****************************************************************************
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
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****************************************************************************/

#ifndef QARRAYDATAPOINTER_H
#define QARRAYDATAPOINTER_H

#include <QtCore/qarraydataops.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Core)

template <class T>
struct QArrayDataPointer
{
private:
    typedef QTypedArrayData<T> Data;
    typedef QArrayDataOps<T> DataOps;

public:
    QArrayDataPointer()
        : d(Data::sharedNull())
    {
    }

    QArrayDataPointer(const QArrayDataPointer &other)
        : d((other.d->ref.ref(), other.d))
    {
    }

    explicit QArrayDataPointer(QTypedArrayData<T> *ptr)
        : d(ptr)
    {
    }

    QArrayDataPointer &operator=(const QArrayDataPointer &other)
    {
        QArrayDataPointer tmp(other);
        this->swap(tmp);
        return *this;
    }

    DataOps &operator*() const
    {
        Q_ASSERT(d);
        return *static_cast<DataOps *>(d);
    }

    DataOps *operator->() const
    {
        Q_ASSERT(d);
        return static_cast<DataOps *>(d);
    }

    ~QArrayDataPointer()
    {
        if (!d->ref.deref()) {
            (*this)->destroyAll();
            Data::deallocate(d);
        }
    }

    bool isNull() const
    {
        return d == Data::sharedNull();
    }

    Data *data() const
    {
        return d;
    }

    void swap(QArrayDataPointer &other)
    {
        qSwap(d, other.d);
    }

    void clear()
    {
        QArrayDataPointer tmp(d);
        d = Data::sharedEmpty();
    }

private:
    Data *d;
};

template <class T>
inline bool operator==(const QArrayDataPointer<T> &lhs, const QArrayDataPointer<T> &rhs)
{
    return lhs.data() == rhs.data();
}

template <class T>
inline bool operator!=(const QArrayDataPointer<T> &lhs, const QArrayDataPointer<T> &rhs)
{
    return lhs.data() != rhs.data();
}

template <class T>
inline void qSwap(QArrayDataPointer<T> &p1, QArrayDataPointer<T> &p2)
{
    p1.swap(p2);
}

QT_END_NAMESPACE

namespace std
{
    template <class T>
    inline void swap(
            QT_PREPEND_NAMESPACE(QArrayDataPointer)<T> &p1,
            QT_PREPEND_NAMESPACE(QArrayDataPointer)<T> &p2)
    {
        p1.swap(p2);
    }
}

QT_END_HEADER

#endif // include guard