const std::function<bool(Operation *op)> &filter) {
  // Check that op has no side effects. This guarantees that we will not
  // reorder side-effecting ops during cluster formation.
  if (!isMemoryEffectFree(op)) return std::nullopt;

  // Operation rejected by the custom filter.
  if (filter && !filter(op)) return std::nullopt;

		Network:         options.LookupNetwork,
	}

	filter := kclient.Filter{
		ObjectFilter: options.Client.ObjectFilter(),
	}
	ConfigMaps := krt.NewInformerFiltered[*v1.ConfigMap](options.Client, filter, krt.WithName("ConfigMaps"))

	authzPolicies := kclient.NewDelayedInformer[*securityclient.AuthorizationPolicy](options.Client,
		gvr.AuthorizationPolicy, kubetypes.StandardInformer, filter)

	recordError(operation, err)
	return err
}

func (in instrumentedRuntimeService) ListContainers(ctx context.Context, filter *runtimeapi.ContainerFilter) ([]*runtimeapi.Container, error) {
	const operation = "list_containers"
	defer recordOperation(operation, time.Now())

	out, err := in.service.ListContainers(ctx, filter)
	recordError(operation, err)
	return out, err
}

    @Override
    public CopySpec filter(Map<String, ?> properties, Class<? extends FilterReader> filterType) {
        return getDelegateCopySpec().filter(properties, filterType);
    }

    @Override
    public CopySpec filter(Class<? extends FilterReader> filterType) {
        return getDelegateCopySpec().filter(filterType);
    }

    @Override
    public CopySpec filter(Closure closure) {

	clusterConfigCmd.PersistentFlags().StringVar(&fqdn, "fqdn", "", "Filter clusters by substring of Service FQDN field")
	clusterConfigCmd.PersistentFlags().StringVar(&direction, "direction", "", "Filter clusters by Direction field")
	clusterConfigCmd.PersistentFlags().StringVar(&subset, "subset", "", "Filter clusters by substring of Subset field")
	clusterConfigCmd.PersistentFlags().IntVar(&port, "port", 0, "Filter clusters by Port field")

  }

  /**
   * Combines this Bloom filter with another Bloom filter by performing a bitwise OR of the
   * underlying data. The mutations happen to <b>this</b> instance. Callers must ensure the Bloom
   * filters are appropriately sized to avoid saturating them.
   *
   * @param that The Bloom filter to combine this Bloom filter with. It is not mutated.

  }

  /**
   * Combines this Bloom filter with another Bloom filter by performing a bitwise OR of the
   * underlying data. The mutations happen to <b>this</b> instance. Callers must ensure the Bloom
   * filters are appropriately sized to avoid saturating them.
   *
   * @param that The Bloom filter to combine this Bloom filter with. It is not mutated.

                unfiltered.add("zzz");
                unfiltered.add("abc");
                return Collections2.filter(Collections2.filter(unfiltered, LENGTH_1), NOT_YYY_ZZZ);
              }
            })
        .named("Collections2.filter, filtered input")
        .withFeatures(
            CollectionFeature.SUPPORTS_ADD,
            CollectionFeature.SUPPORTS_REMOVE,

		nVirtual,
	)
	return listeners
}

func buildOutboundCatchAllNetworkFiltersOnly(push *model.PushContext, node *model.Proxy) []*listener.Filter {
	var egressCluster string

	if util.IsAllowAnyOutbound(node) {
		// We need a passthrough filter to fill in the filter stack for orig_dst listener
		egressCluster = util.PassthroughCluster

		// no need to check for nil value as the previous if check has checked

					Filter:                  Filter{Prefix: "xy", And: And{}, Tag: Tag{Key: "k1", Value: "v1"}},
				},
				{
					Status:                  Enabled,
					Priority:                1,
					DeleteMarkerReplication: DeleteMarkerReplication{Status: Enabled},
					DeleteReplication:       DeleteReplication{Status: Disabled},
					Filter:                  Filter{Prefix: "xyz"},
				},
			},
		},