Function foreach

src/master/weights_handler.cpp:73–75

      RepeatedPtrField<WeightInfo> filteredWeightInfos;

      foreach (const WeightInfo& weightInfo, weightInfos) {
        filteredWeightInfos.Add()->CopyFrom(weightInfo);
      }

      return OK(JSON::protobuf(filteredWeightInfos),
                request.url.query.get("jsonp"));