protected void incrCounter(Pair<String, String> groupCounterPair, long incr) {
    counterHelper_.incrCounter(groupCounterPair.first, groupCounterPair.second, incr);
  }
protected void incrCounter(Pair<String, String> groupCounterPair, long incr) {
    counterHelper_.incrCounter(groupCounterPair.first, groupCounterPair.second, incr);
  }
protected void incrCounter ( Pair < String , String > groupCounterPair , long incr ) { counterHelper_ . incrCounter ( groupCounterPair . first , groupCounterPair . second , incr ) ; }
same as incrCounter(pair.first, pair.second, incr).
same as incrCounter ( pair . first pair . second incr ) .