// -*- mode: c++; c-basic-offset: 4 -*-

/*

 * This file is part of the DOM implementation for KDE.

 * Copyright (C) 2005, 2006 Apple Computer, Inc.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public License

 * along with this library; see the file COPYING.LIB.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 *

 */

#ifndef DocPtr_h

#define DocPtr_h

namespace WebCore {

template <class T> class DocPtr {

public:

    DocPtr() : m_ptr(0) {}

    DocPtr(T *ptr) : m_ptr(ptr) { if (ptr) ptr->selfOnlyRef(); }

    DocPtr(const DocPtr &o) : m_ptr(o.m_ptr) { if (T *ptr = m_ptr) ptr->selfOnlyRef(); }

    ~DocPtr() { if (T *ptr = m_ptr) ptr->selfOnlyDeref(); }

    template <class U> DocPtr(const DocPtr<U> &o) : m_ptr(o.get()) { if (T *ptr = m_ptr) ptr->selfOnlyRef(); }

    void resetSkippingRef(T *o) { m_ptr = o; }

    T *get() const { return m_ptr; }

    T &operator*() const { return *m_ptr; }

    T *operator->() const { return m_ptr; }

    bool operator!() const { return !m_ptr; }

    // this type conversion operator allows implicit conversion to

    // bool but not to other integer types

    typedef T * (DocPtr::*UnspecifiedBoolType)() const;

    operator UnspecifiedBoolType() const

    {

        return m_ptr ? &DocPtr::get : 0;

    }

    DocPtr &operator=(const DocPtr &);

    DocPtr &operator=(T *);

 private:

    T *m_ptr;

};

template <class T> DocPtr<T> &DocPtr<T>::operator=(const DocPtr<T> &o) 

{

    T *optr = o.m_ptr;

    if (optr)

        optr->selfOnlyRef();

    if (T *ptr = m_ptr)

        ptr->selfOnlyDeref();

    m_ptr = optr;

        return *this;

}

template <class T> inline DocPtr<T> &DocPtr<T>::operator=(T *optr)

{

    if (optr)

        optr->selfOnlyRef();

    if (T *ptr = m_ptr)

        ptr->selfOnlyDeref();

    m_ptr = optr;

    return *this;

}

template <class T> inline bool operator==(const DocPtr<T> &a, const DocPtr<T> &b) 

{ 

    return a.get() == b.get(); 

}

template <class T> inline bool operator==(const DocPtr<T> &a, const T *b) 

{ 

    return a.get() == b; 

}

template <class T> inline bool operator==(const T *a, const DocPtr<T> &b) 

{

    return a == b.get(); 

}

template <class T> inline bool operator!=(const DocPtr<T> &a, const DocPtr<T> &b) 

{ 

    return a.get() != b.get(); 

}

template <class T> inline bool operator!=(const DocPtr<T> &a, const T *b)

{

    return a.get() != b; 

}

template <class T> inline bool operator!=(const T *a, const DocPtr<T> &b) 

{ 

    return a != b.get(); 

}

} // namespace WebCore

#endif // DocPtr_h