/*

 *  Copyright (C) 2006, 2010 Apple Inc. All rights reserved.

 *

 *  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 WTF_OwnArrayPtr_h

#define WTF_OwnArrayPtr_h

#include <algorithm>

#include <wtf/Assertions.h>

#include <wtf/Noncopyable.h>

namespace WTF {

    template <typename T> class OwnArrayPtr : public Noncopyable {

    public:

        explicit OwnArrayPtr(T* ptr = 0) : m_ptr(ptr) { }

        ~OwnArrayPtr() { safeDelete(m_ptr); }

        T* get() const { return m_ptr; }

        T* release() { T* ptr = m_ptr; m_ptr = 0; return ptr; }

        // FIXME: This should be removed and replaced with PassOwnArrayPtr. 

        void set(T* ptr)

        {

            ASSERT(!ptr || m_ptr != ptr);

            T* oldPtr = m_ptr;

            m_ptr = ptr;

            safeDelete(oldPtr);

        }

        void clear();

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

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

        T& operator[](std::ptrdiff_t i) const { ASSERT(m_ptr); ASSERT(i >= 0); return m_ptr[i]; }

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

        // This conversion operator allows implicit conversion to bool but not to other integer types.

#if COMPILER(WINSCW)

        operator bool() const { return m_ptr; }

#else

        typedef T* OwnArrayPtr::*UnspecifiedBoolType;

        operator UnspecifiedBoolType() const { return m_ptr ? &OwnArrayPtr::m_ptr : 0; }

#endif

        void swap(OwnArrayPtr& o) { std::swap(m_ptr, o.m_ptr); }

    private:

        static void safeDelete(T*);

        T* m_ptr;

    };

    template<typename T> inline void OwnArrayPtr<T>::clear()

    {

        T* ptr = m_ptr;

        m_ptr = 0;

        safeDelete(ptr);

    }

    template<typename T> inline void OwnArrayPtr<T>::safeDelete(T* ptr)

    {

        typedef char known[sizeof(T) ? 1 : -1];

        if (sizeof(known))

            delete [] ptr;

    }

    template <typename T> inline void swap(OwnArrayPtr<T>& a, OwnArrayPtr<T>& b) { a.swap(b); }

    template <typename T> inline T* getPtr(const OwnArrayPtr<T>& p)

    {

        return p.get();

    }

} // namespace WTF

using WTF::OwnArrayPtr;

#endif // WTF_OwnArrayPtr_h