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24 * $XConsortium: dl_list_cell.h /main/5 1996/07/18 14:41:01 drk $
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51 #ifndef _dl_list_cell_h
52 #define _dl_list_cell_h 1
54 #include "object/composite.h"
55 #include "object/oid_t.h"
57 /***************************************
59 ****************************************/
61 class dl_list_cell: public composite
65 dl_list_cell(c_code_t c_id = DL_LIST_CELL_CODE);
66 dl_list_cell(const dl_list_cell&);
67 virtual ~dl_list_cell();
69 MMDB_SIGNATURES(dl_list_cell);
72 // value comparison functions
73 virtual Boolean value_EQ(root&, Boolean safe = true) const ;
74 virtual Boolean value_LS(root&, Boolean safe = true) const ;
78 virtual io_status asciiOut(ostream& s) ;
79 virtual io_status asciiIn(istream&) ;
81 // set/retrieval dl_list_cell functions
82 void set_backward_ptr(const oid_t&);
83 void set_forward_ptr(const oid_t&);
85 oid_t& get_backward_ptr();
86 oid_t& get_forward_ptr();
88 // compacted disk representation In and Out functions
89 virtual int cdr_sizeof();
90 virtual io_status cdrOut(buffer&);
91 virtual io_status cdrIn(buffer&);
95 oid_t v_backward_ptr; // backward ptr
96 oid_t v_forward_ptr; // forward ptr
101 HANDLER_SIGNATURES(dl_list_cell)