function slice ($offset = 0, $count = -1)
  {
    $this->setIterator (new LimitIterator ($this->getIterator (), $offset, $count));
    return $this;
  }
function slice ($offset = 0, $count = -1)
  {
    $this->setIterator (new LimitIterator ($this->getIterator (), $offset, $count));
    return $this;
  }
function slice ( $ offset = 0 , $ count = - 1 ) { $ this -> setIterator ( new LimitIterator ( $ this -> getIterator ( ) , $ offset , $ count ) ) ; return $ this ; }
Limits iteration to the specified range.

@param int $offset Starts at 0.
@param int $count  -1 = all.
@return $this
Limits iteration to the specified range .