Struct MultiTopic 

pub struct MultiTopic<T: DdsType> { /* private fields */ }

MultiTopic<T> — Spec §2.2.2.3.4 (DDS 1.4 optionales Feature).

Eine MultiTopic kombiniert mehrere Underlying-Topics in einer einzigen TopicDescription via subscription_expression (SQL- Subset). Der Resulting-Type T ist User-definiert; die Underlying-Topics koennen unterschiedliche Types haben.

Cross-Topic-Sample-Routing: Der Join-Operator ist ueber hash_join_two und Self::evaluate_joined live. Die subscription_expression referenziert Felder als <topic_name>.<field_path> (dotted), und JoinedRow dispatched die Lookups an die matchenden Topic-Quellen.

Implementations

impl<T: DdsType> MultiTopic<T>

pub fn get_subscription_expression(&self) -> &str

Spec §2.2.2.3.4.4 get_subscription_expression.

pub fn get_expression_parameters(&self) -> Vec<String>

Spec §2.2.2.3.4.5 get_expression_parameters.

pub fn set_expression_parameters(&self, params: Vec<String>) -> Result<()>

Spec §2.2.2.3.4.6 set_expression_parameters.

Errors

BadParameter wenn ein referenzierter %N-Parameter ausserhalb des neuen Vec liegt; PreconditionNotMet bei Lock-Poisoning.

pub fn get_related_topic_names(&self) -> &[String]

Spec §2.2.2.3.4.3 get_related_topic (PSM gibt eine Sequence zurueck — wir liefern die Namen).

pub fn evaluate_joined(&self, row: &JoinedRow<'_>) -> Result<bool>

Wertet die subscription_expression gegen ein JoinedRow aus (Cross-Topic-Predicate). Spec §2.2.2.3.4.

Errors

PreconditionNotMet bei Lock-Poisoning oder SQL-Eval-Fehler.

Trait Implementations

impl<T: DdsType> Clone for MultiTopic<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: DdsType> Debug for MultiTopic<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T: DdsType> TopicDescription for MultiTopic<T>

fn get_type_name(&self) -> &str

Type-Name (z.B. "std_msgs::msg::String"). Spec §2.2.2.3.1 get_type_name.

fn get_name(&self) -> &str

Topic-Name (z.B. "ChatterTopic"). Spec §2.2.2.3.1 get_name.

fn get_participant(&self) -> &DomainParticipant

Owning Participant. Spec §2.2.2.3.1 get_participant.