include/wvlink.h

   1 /* -*- Mode: C++ -*-
   2  * Worldvisions Weaver Software:
   3  *   Copyright (C) 1997-2002 Net Integration Technologies, Inc.
   4  *
   5  * WvLink is one element of a linked list.
   6  * Used by wvlinklist.h.
   7  */
   8 #ifndef __WVLINK_H
   9 #define __WVLINK_H
  10
  11 #include <stdlib.h>  // for 'NULL'
  12
  13 /**
  14  * WvLink is one element of a WvList<T>.
  15  *
  16  * Note that WvLink itself is untyped to minimize the amount of
  17  * generated code.  This means that WvLink cannot handle the
  18  * autofree behaviour itself which would require static type
  19  * information.  Instead, it defers this behaviour to the
  20  * template instantiation of WvList<T> that uses it.
  21  *
  22  */
  23 class WvLink
  24 {
  25 public:
  26     void *data;
  27     WvLink *next;
  28     const char *id;
  29
  30 private:
  31     bool autofree : 1;
  32
  33 public:
  34     WvLink(void *_data, bool _autofree, const char *_id = NULL):
  35         data(_data), next(NULL), id(_id), autofree(_autofree)
  36     {}
  37
  38     WvLink(void *_data, WvLink *prev, WvLink *&tail, bool _autofree,
  39            const char *_id = NULL);
  40
  41     bool get_autofree()
  42     {
  43         return autofree;
  44     }
  45
  46     void set_autofree(bool _autofree)
  47     {
  48         autofree = _autofree;
  49     }
  50
  51     void unlink(WvLink *prev)
  52     {
  53         prev->next = next;
  54         delete this;
  55     }
  56 };
  57
  58 #define WvIterStuff(_type_) \
  59     /*! @brief Returns a reference to the current element. */ \
  60     _type_ &operator () () const \
  61         { return *ptr(); } \
  62     /*! @brief Returns a pointer to the current element. */ \
  63     _type_ *operator -> () const \
  64         { return ptr(); } \
  65     /*! @brief Returns a reference to the current element. */ \
  66     _type_ &operator* () const \
  67         { return *ptr(); }
  68
  69 #endif // __WVLINK_H