DDS::DataRepresentationQosPolicy Class Reference

This QoS policy contains a list of representation identifiers used by DDS::DataWriter and DDS::DataReader entities to negotiate which data representation to use. More...

#include <managed_infrastructure.h>

Static Public Member Functions
static System::String ^	get_data_representation_qos_policy_name ()
	Stringified human-readable name for DDS::DataRepresentationQosPolicy. More...

Public Attributes
ShortSeq ^	value
	Sequence of representation identifiers. More...

Static Public Attributes
static System::Int16	XCDR_DATA_REPRESENTATION
	Corresponds to the Extended Common Data Representation encoding version 1. More...
static System::Int16	XML_DATA_REPRESENTATION
	Corresponds to the XML Data Representation (unsupported). More...
static System::Int16	XCDR2_DATA_REPRESENTATION
	Corresponds to the Extended Common Data Representation encoding version 2. More...
static System::Int16	AUTO_DATA_REPRESENTATION
	Representation is automatically chosen based on the type. More...

Detailed Description

This QoS policy contains a list of representation identifiers used by DDS::DataWriter and DDS::DataReader entities to negotiate which data representation to use.

Entity:

DDS::Topic, DDS::DataReader, DDS::DataWriter

Status:

DDS::StatusKind::OFFERED_INCOMPATIBLE_QOS_STATUS, DDS::StatusKind::REQUESTED_INCOMPATIBLE_QOS_STATUS

Properties:

RxO = YES
Changeable = UNTIL ENABLE

See also

DATA_REPRESENTATION

This policy has request-offer semantics. A DDS::DataWriter may only offer a single representation. Attempting to put multiple representations in a DDS::DataWriter will result in DDS::Retcode_InconsistentPolicy. A DDS::DataWriter will use its offered policy to communicate with its matched DDS::DataReader entities. A DDS::DataReader requests one or more representations. If a DDS::DataWriter offers a representation that is contained within the sequence of the DDS::DataReader, the offer satisfies the request and the policies are compatible. Otherwise, they are incompatible.

When representations are specified in the DDS::TopicQos, DDS::Publisher::copy_from_topic_qos copies the first element of the sequence, and DDS::Subscriber::copy_from_topic_qos copies the whole sequence.

Member Data Documentation

value

ShortSeq ^ DDS::DataRepresentationQosPolicy::value

Sequence of representation identifiers.

[default] For DDS::Topic, DDS::DataWriter, and DDS::DataReader, a list with one element: DDS::DataRepresentationId_t::AUTO_DATA_REPRESENTATION.

Note

An empty sequence is equivalent to a list with one element: DDS::DataRepresentationId_t::XCDR_DATA_REPRESENTATION.