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DeviceRewinder.h

/*****************************************************************************
 * Author:   Valient Gough <vgough@pobox.com>
 *
 *****************************************************************************
 * Copyright (c) 2001, Valient Gough
 *
 * This library is free software; you can distribute it and/or modify it under
 * the terms of the GNU Lesser General Public License (LGPL), as published by
 * the Free Software Foundation; either version 2.1 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 LGPL in the file COPYING for more
 * details.
 *
 */

#ifndef _DeviceRewinder_incl_
#define _DeviceRewinder_incl_

#include <rel/TypeStream.h>

namespace rel
{

    class DeviceRewinder
    {
    public:
        /* It is ok to use a const restartable coding with a DeviceRewinder,
         * because it makes sure the the coding is restarted when it is done,
         * so it is effectively const (as long as there are no interleaved
         * accesses by users).
         */
        explicit DeviceRewinder(const TypeStream &coding);
        explicit DeviceRewinder(const TypeStream *coding);
        DeviceRewinder(const DeviceRewinder &src);

        ~DeviceRewinder();

        void reset() const;

        operator TypeStream * () const;
        operator const TypeStream & () const;

    private:
        const TypeStream *fCoding;
        int fBegin;

    };

}  // namespace rel

#endif

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