+/**
+ * Set a sink component's iterator addition callback.
+ *
+ * @param sink Sink component instance
+ * @param add_iterator Iterator addition callback
+ * @returns One of #bt_component_status values
+ */
+extern enum bt_component_status
+bt_component_sink_set_add_iterator_cb(struct bt_component *sink,
+ bt_component_sink_add_iterator_cb add_iterator);
+
+/* Defaults to 1. */
+extern enum bt_component_status
+bt_component_sink_set_minimum_input_count(struct bt_component *sink,
+ unsigned int minimum);
+
+/* Defaults to 1. */
+extern enum bt_component_status
+bt_component_sink_set_maximum_input_count(struct bt_component *sink,
+ unsigned int maximum);
+
+extern enum bt_component_status
+bt_component_sink_get_input_count(struct bt_component *sink,
+ unsigned int *count);
+
+/* May return NULL after an interator has reached its end. */
+extern enum bt_component_status
+bt_component_sink_get_input_iterator(struct bt_component *sink,
+ unsigned int input, struct bt_notification_iterator **iterator);
+
+/** bt_component_filter */
+/**
+ * Iterator initialization function type.
+ *
+ * A notification iterator's private data, deinitialization, next, and get
+ * callbacks must be set by this function.
+ *
+ * @param filter Filter component instance
+ * @param iterator Notification iterator instance
+ */
+typedef enum bt_component_status (*bt_component_filter_init_iterator_cb)(
+ struct bt_component *, struct bt_notification_iterator *);
+
+/**
+ * Iterator addition function type.
+ *
+ * A filter component may choose to refuse the addition of an iterator
+ * by not returning BT_COMPONENT_STATUS_OK.
+ *
+ * @param filter Filter component instance
+ * @returns One of #bt_component_status values
+ */
+typedef enum bt_component_status (*bt_component_filter_add_iterator_cb)(
+ struct bt_component *, struct bt_notification_iterator *);
+
+/**
+ * Set a filter component's iterator initialization function.
+ *
+ * @param filter Filter component instance
+ * @param init_iterator Notification iterator initialization callback
+ */
+extern enum bt_component_status
+bt_component_filter_set_iterator_init_cb(struct bt_component *filter,
+ bt_component_filter_init_iterator_cb init_iterator);
+
+/**
+ * Set a filter component's iterator addition callback.
+ *
+ * @param filter Filter component instance
+ * @param add_iterator Iterator addition callback
+ * @returns One of #bt_component_status values
+ */
+extern enum bt_component_status
+bt_component_filter_set_add_iterator_cb(struct bt_component *filter,
+ bt_component_filter_add_iterator_cb add_iterator);
+
+/* Defaults to 1. */
+extern enum bt_component_status
+bt_component_filter_set_minimum_input_count(struct bt_component *filter,
+ unsigned int minimum);
+
+/* Defaults to 1. */
+extern enum bt_component_status
+bt_component_filter_set_maximum_input_count(struct bt_component *filter,
+ unsigned int maximum);
+
+extern enum bt_component_status
+bt_component_filter_get_input_count(struct bt_component *filter,
+ unsigned int *count);
+
+/* May return NULL after an interator has reached its end. */
+extern enum bt_component_status
+bt_component_filter_get_input_iterator(struct bt_component *filter,
+ unsigned int input, struct bt_notification_iterator **iterator);
+
+/** bt_notification_iterator */
+/**
+ * Function returning an iterator's current notification.
+ *
+ * @param iterator Notification iterator instance
+ * @returns A notification instance
+ */
+typedef struct bt_notification *(*bt_notification_iterator_get_cb)(
+ struct bt_notification_iterator *iterator);
+
+/**
+ * Function advancing an iterator's position of one element.
+ *
+ * @param iterator Notification iterator instance
+ * @returns One of #bt_notification_iterator_status values
+ */
+typedef enum bt_notification_iterator_status (*bt_notification_iterator_next_cb)(
+ struct bt_notification_iterator *iterator);
+
+/**
+ * Function cleaning-up an iterator's private data on destruction.
+ *
+ * @param iterator Notification iterator instance
+ */
+typedef void (*bt_notification_iterator_destroy_cb)(
+ struct bt_notification_iterator *iterator);
+
+/**
+ * Set an iterator's "get" callback which return the current notification.
+ *
+ * @param iterator Notification iterator instance
+ * @param get Notification return callback
+ * @returns One of #bt_notification_iterator_status values
+ */
+extern enum bt_notification_iterator_status
+bt_notification_iterator_set_get_cb(struct bt_notification_iterator *iterator,
+ bt_notification_iterator_get_cb get);
+
+/**
+ * Set an iterator's "next" callback which advances the iterator's position.
+ *
+ * @param iterator Notification iterator instance
+ * @param next Iterator "next" callback
+ * @returns One of #bt_notification_iterator_status values
+ */
+extern enum bt_notification_iterator_status
+bt_notification_iterator_set_next_cb(struct bt_notification_iterator *iterator,
+ bt_notification_iterator_next_cb next);
+
+/**
+ * Set an iterator's "destroy" callback.
+ *
+ * @param iterator Notification iterator instance
+ * @param next Iterator destruction callback
+ * @returns One of #bt_notification_iterator_status values
+ */
+extern enum bt_notification_iterator_status
+bt_notification_iterator_set_destroy_cb(
+ struct bt_notification_iterator *iterator,
+ bt_notification_iterator_destroy_cb destroy);
+
+/**
+ * Set an iterator's private data.
+ *
+ * @param iterator Notification iterator instance
+ * @param data Iterator private data
+ * @returns One of #bt_notification_iterator_status values
+ */
+extern enum bt_notification_iterator_status
+bt_notification_iterator_set_private_data(
+ struct bt_notification_iterator *iterator, void *data);