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DeviceRewinder.h

00001 /*****************************************************************************
00002  * Author:   Valient Gough <vgough@pobox.com>
00003  *
00004  *****************************************************************************
00005  * Copyright (c) 2001, Valient Gough
00006  *
00007  * This library is free software; you can distribute it and/or modify it under
00008  * the terms of the GNU Lesser General Public License (LGPL), as published by
00009  * the Free Software Foundation; either version 2.1 of the License, or (at your
00010  * option) any later version.
00011  *
00012  * This library is distributed in the hope that it will be useful, but WITHOUT
00013  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00014  * FITNESS FOR A PARTICULAR PURPOSE.  See the LGPL in the file COPYING for more
00015  * details.
00016  *
00017  */
00018 
00019 #ifndef _DeviceRewinder_incl_
00020 #define _DeviceRewinder_incl_
00021 
00022 #include <rel/TypeStream.h>
00023 
00024 namespace rel
00025 {
00026 
00037     class DeviceRewinder
00038     {
00039     public:
00040         /* It is ok to use a const restartable coding with a DeviceRewinder,
00041          * because it makes sure the the coding is restarted when it is done,
00042          * so it is effectively const (as long as there are no interleaved
00043          * accesses by users).
00044          */
00045         explicit DeviceRewinder(const TypeStream &coding);
00046         explicit DeviceRewinder(const TypeStream *coding);
00047         DeviceRewinder(const DeviceRewinder &src);
00048 
00049         ~DeviceRewinder();
00050 
00051         void reset() const;
00052 
00053         operator TypeStream * () const;
00054         operator const TypeStream & () const;
00055 
00056     private:
00057         const TypeStream *fCoding;
00058         int fBegin;
00059 
00060     };
00061 
00062 }  // namespace rel
00063 
00064 #endif

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