MNRopeRep.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_ROPE_REP_H
#define _R_ROPE_REP_H

#include "MNRopeRefCount.h"
#include "MNProtectedVar.h"

struct MNRopeRep
    : public MNRopeRefCount
{
public:
    typedef ProtectedPtr<uchar_t*> ProtectedUCharPtr;

    enum {
        _S_max_rope_depth = 45
    };
    enum _Tag {
        _S_leaf, _S_concat, _S_substringfn, _S_function
    };

    size_t            _M_size;
    _Tag              _M_tag:8;
    bool              _M_is_balanced:8;
    unsigned char     _M_depth;

    ProtectedUCharPtr _M_c_string;

    MNRopeRep(_Tag __t, int __d, bool __b, size_t __size)
        : MNRopeRefCount(1)
        , _M_size(__size)
        , _M_tag(__t)
        , _M_is_balanced(__b)
        , _M_depth(__d)
        , _M_c_string(0)
    { }

    virtual ~MNRopeRep( )
    { }

    static void _S_free_string( uchar_t*, size_t __len);

    void _M_free_c_string();
    void _M_free_tree();

    void _M_unref_nonnil()
    {
        if (0 == _M_decr()) _M_free_tree();
    }

    void _M_ref_nonnil()
    {
        _M_incr();
    }

    static void _S_unref(MNRopeRep* __t)
    {
        if (0 != __t) {
            __t->_M_unref_nonnil();
        }
    }

    static void _S_ref(MNRopeRep* __t)
    {
        if (0 != __t) __t->_M_incr();
    }

    static void _S_free_if_unref(MNRopeRep* __t)
    {
        if (0 != __t && 0 == __t->_M_ref_count) __t->_M_free_tree();
    }
};


#endif /* _R_ROPE_REP_H */

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