What must I do to get listIter to behave as an iterator and not a
const_iterator?

 template <class L> // return -1 if wrapped, 0 if it is the next item, and 1
if it stays at the edge.
  int nextInList ( const bool& wrap, const L& theList, L::iterator&
listIter )
   {
    ++listIter;
    if ( listIter == theList.end() ) {
     if ( wrap ) {
      listIter = theList.begin();
      return -1;
     } else {
      --listIter;
      return 1;
     }
    }
    return 0;
   }
 template <class L> // return -1 if wrapped, 0 if it is the prev item, and 1
if it stays at the edge.
  int prevInList ( const bool& wrap, const L& theList, L::iterator*
listIter )
   {
    if ( listIter == theList.begin() ) {
     if ( wrap ) {
      listIter = theList.end();
      --listIter;
      return -1;
     }
    } else {
     --listIter;
     return 0;
    }
    return 1;
   }

All help much appreciated!
This has eaten up my whole day..


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>   int nextInList ( const bool& wrap, const L& theList, L::iterator&
> listIter )
>    {
>     ++listIter;
>     if ( listIter == theList.end() ) {
>      if ( wrap ) {
>       listIter = theList.begin();
               ^^^^^^^
I would say that this assignment here is the culprit. theList is declared as
const in your parameter list, so all functions that act on it must be const.
theList.begin() is returning a const_iterator because of this.

>       return -1;
>      } else {
>       --listIter;
>       return 1;
>      }
>     }
>     return 0;
>    }


--

===================
Matt Ferreira
mferreira@comcast.net



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