private com.google.protobuf.RepeatedFieldBuilder<
          org.bwapi.proxy.messages.BasicTypes.Position, org.bwapi.proxy.messages.BasicTypes.Position.Builder, org.bwapi.proxy.messages.BasicTypes.PositionOrBuilder> 
          getVerticesFieldBuilder() {
        if (verticesBuilder_ == null) {
          verticesBuilder_ = new com.google.protobuf.RepeatedFieldBuilder<
              org.bwapi.proxy.messages.BasicTypes.Position, org.bwapi.proxy.messages.BasicTypes.Position.Builder, org.bwapi.proxy.messages.BasicTypes.PositionOrBuilder>(
                  vertices_,
                  ((bitField0_ & 0x00000001) == 0x00000001),
                  getParentForChildren(),
                  isClean());
          vertices_ = null;
        }
        return verticesBuilder_;
      }