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 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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