.. _dds_layers_subscription_subscriber:

Subscriber
==========

The ``Subscriber`` acts on behalf of one or several :ref:`dds_layers_subscription_datareader` objects.
It serves as a container that allows grouping different DataReader objects to manage the unprocessed callbacks through an optional :ref:`dds_layers_subscription_subscriberqos`.

DataReader objects that belong to the same Subscriber do not have any other relation among each and act independently.
Specifically, a Subscriber can host DataReader objects for different :ref:`dds_layers_topic` and data types.

.. _dds_layers_subscription_subscriberqos:

SubscriberQos
-------------

``SubscriberQos`` controls the behavior of the :ref:`dds_layers_subscription_subscriber`.
Internally it contains the following :ref:`dds_layers_infrastructure_policies` objects:

* ``entity_factory_qos`` as :ref:`entityfactoryqospolicy`
    Defines if the Publisher will automatically enable created subentities or not.

Example
^^^^^^^

.. literalinclude:: ../../../code/policies_examples/main.cpp
   :language: c++
   :dedent: 8
   :start-after: // DDS_SUBSCRIBER_QOS
   :end-before: //! DDS_SUBSCRIBER_QOS