private com.google.protobuf.RepeatedFieldBuilder<
          org.box2d.proto.Box2D.PbBody, org.box2d.proto.Box2D.PbBody.Builder, org.box2d.proto.Box2D.PbBodyOrBuilder> 
          getBodiesFieldBuilder() {
        if (bodiesBuilder_ == null) {
          bodiesBuilder_ = new com.google.protobuf.RepeatedFieldBuilder<
              org.box2d.proto.Box2D.PbBody, org.box2d.proto.Box2D.PbBody.Builder, org.box2d.proto.Box2D.PbBodyOrBuilder>(
                  bodies_,
                  ((bitField0_ & 0x00000080) == 0x00000080),
                  getParentForChildren(),
                  isClean());
          bodies_ = null;
        }
        return bodiesBuilder_;
      }