MNRopeCharProducer.h

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/*
 * Copyright (c) 1997
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 * Heavily modified by KOM/Darmstadt University of Technology, 2000
 */
#ifndef R_CHAR_PRODUCER_H
#define R_CHAR_PRODUCER_H

// MNRopeCharProducers are logically functions that generate a section of
// a string.  These can be convereted to ropes.  The resulting rope
// invokes the MNRopeCharProducer on demand.  This allows, for example,
// files to be viewed as ropes without reading the entire file.
class MNRopeCharProducer
{
    public:
        virtual ~MNRopeCharProducer() {};
        virtual void operator()(size_t __start_pos, size_t __len, 
                                uchar_t* __buffer) = 0;
        // Buffer should really be an arbitrary output iterator.
        // That way we could flatten directly into an ostream, etc.
        // This is thoroughly impossible, since iterator types don't
        // have runtime descriptions.
};


#endif /* R_CHAR_PRODUCER_H */

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