Topic Use Cases

Create a Topic

Create a Topic with all default QoS policies and no listener.

The type name used for the Topic type is not specified, so the default is 'foo::ExampleType'. Note that the registration of the data type (an explicit operation required in the older C++ API) is handled implicitly.

#include <dds/domain/ddsdomain.hpp>
#include <dds/topic/ddstopic.hpp>
#include "foo.hh" // declares the foo types used in the examples

dds::domain::DomainParticipant participant( 0 );

dds::topic::Topic<foo::ExampleType> topic( participant, "ExampleTopic" );

Similar, but the type name used for the Topic type is specified as 'ExampleType'. [The type 'foo::ExampleType' is implicitly registered with the type name 'ExampleType'.]

dds::domain::DomainParticipant participant( 0 );

dds::topic::Topic<foo::ExampleType> topic( participant, "ExampleTopic", "ExampleType" );

Create a Topic with modified QoS policies and no listener.

dds::domain::DomainParticipant participant( 0 );

dds::topic::qos::TopicQos qos;
qos <<  dds::core::policy::Reliability::Reliable();

dds::topic::Topic<foo::ExampleType> topic( participant, "ExampleTopic", qos );

Create a Topic with modified QoS policies and a listener.

dds::domain::DomainParticipant participant( 0 );

dds::topic::qos::TopicQos qos;
qos << dds::core::policy::EntityFactory::ManuallyEnable();

ExampleTopicListener : public dds::topic::NoOpTopicListener { ... };
ExampleTopicListener * topicListener = new ExampleTopicListener();
dds::topic::Topic<foo::ExampleType>
   topic( participant, "ExampleTopic", qos,
          topicListener,  dds::core::status::StatusMask::inconsistent_topic() );

Find a local Topic