[chord] chord Digest, Vol 65, Issue 3

[刘昶言]

And i have modify the code for the bug ,but i think maybe the method is
ugly.

it is like this:

pred_list.C
void
pred_list::update_pred (const chord_node &p)
{
  ptr<location> curp = pred ();

  ptr<location> ploc;
  if (between (curp->id (), myID, p.x))
    ploc = locations->insert (p);
  if(oldpred_ != pred()){
    stable_pred = false;
  }
  oldpred_ = pred ();
}


bool
pred_list::isstable ()
{
  // Won't be true until update_pred has been called once.
#ifndef PRED_LIST
  return oldpred_ == pred ();
#else /* !PRED_LIST */
  bool predlist_isstable = stable_predlist && stable_pred;
  if(oldpred_ == pred ()) {
    stable_pred = true;
  }
  return  predlist_isstable;
#endif /* PRED_LIST */
}
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