private com.google.protobuf.RepeatedFieldBuilder<
          org.bwapi.proxy.messages.GameMessages.UnitId, org.bwapi.proxy.messages.GameMessages.UnitId.Builder, org.bwapi.proxy.messages.GameMessages.UnitIdOrBuilder> 
          getHiddenUnitsFieldBuilder() {
        if (hiddenUnitsBuilder_ == null) {
          hiddenUnitsBuilder_ = new com.google.protobuf.RepeatedFieldBuilder<
              org.bwapi.proxy.messages.GameMessages.UnitId, org.bwapi.proxy.messages.GameMessages.UnitId.Builder, org.bwapi.proxy.messages.GameMessages.UnitIdOrBuilder>(
                  hiddenUnits_,
                  ((bitField0_ & 0x00001000) == 0x00001000),
                  getParentForChildren(),
                  isClean());
          hiddenUnits_ = null;
        }
        return hiddenUnitsBuilder_;
      }