9.3.10 Getting the Implicit Publisher or Subscriber
The get_implicit_publisher() operation allows you to access the DomainParticipant’s implicit Publisher. If one does not already exist, this operation creates an implicit Publisher.
There is a similar operation for implicit Subscribers:
DDSPublisher * get_implicit_publisher ()
DDSSubscriber * get_implicit_subscriber()
There can only be one implicit Publisher and one implicit Subscriber per DomainParticipant. They are created with default QoS values (DDS_PUBLISHER_QOS_DEFAULT) and no Listener. For more information, see 7.2.1 Creating Publishers Explicitly vs. Implicitly. You can use an implicit Publisher or implicit Subscriber just like an explicitly created one.
An implicit Publisher/Subscriber is deleted automatically when delete_contained_entities() is called. It can also be deleted by calling delete_publisher/subscriber() with the implicit Publisher/Subscriber as a parameter.
When a DomainParticipant is deleted, if there are no attached DataReaders that belong to the implicit Subscriber or no attached DataWriters that belong to the implicit Publisher, any implicit Publisher/Subscriber will be deleted by the middleware implicitly.
Note: It is not safe to create an implicit Publisher/Subscriber while another thread may be simultaneously calling set_default_[publisher/subscriber]_qos().
How to get the implicit Publisher/Subscriber. (For simplicity, error handling is not shown.)
using namespace DDS;
...
Publisher * publisher = NULL;
Subscriber * subscriber = NULL;
PublisherQos publisher_qos;
SubscriberQos subscriber_qos;
...
publisher = participant->get_implicit_publisher();
/* Change implicit publisher QoS */
publisher->get_qos(publisher_qos);
publisher_qos.partition.name.maximum(3);
publisher_qos.partition.name.length(3);
publisher_qos.partition.name[0] = DDS_String_dup("partition_A");
publisher_qos.partition.name[1] = DDS_String_dup("partition_B");
publisher_qos.partition.name[2] = DDS_String_dup("partition_C");
publisher->set_qos(publisher_qos);
/* Get implicit subscriber */
subscriber = participant->get_implicit_subscriber();
/* Change implicit subscriber QoS */
subscriber_qos.partition.name.maximum(3);
subscriber _qos.partition.name.length(3);
subscriber _qos.partition.name[0] = DDS_String_dup("partition_A");
subscriber _qos.partition.name[1] = DDS_String_dup("partition_B");
subscriber _qos.partition.name[2] = DDS_String_dup("partition_C");
subscriber->set_qos(subscriber_qos);
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