STL中的如此簡單的常識現在才知道!!!

我的一段有關list中刪除某一元素的代碼:

RecorderList::iterator iter = recorders.begin();
 while (iter != recorders.end())
 {
  Recorder* item = (*iter);
  
  if (item->GetSpanSize() == 0)
  {
   wprintf(_T("%s :/n"),item->getRecordURI().c_str());
   item->Stop();      
   recorders.erase(iter);
  }
  else
      iter++; 

}

唉,我調試了半天才感覺是erase()的問題!!!後google和MSDN下才知道:

erase()執行後不會更新iterator 而是使它失效:

Remarks

No reallocation occurs, so iterators and references become invalid only for the erased elements.

erase never throws an exception.

所以要在erase()前更新iterator:

if (item->GetSpanSize() == 0)
  {
   wprintf(_T("%s :/n"),item->getRecordURI().c_str());
   item->Stop();      
   recorders.erase(iter++);
  }
  else
      iter++;