DDS_DataRepresentationQosPolicy Struct Reference

This QoS policy contains a list of representation identifiers used by DDSDataWriter and DDSDataReader entities to negotiate which data representation to use. More...

#include <dds_c_infrastructure.h>

Public Attributes
struct DDS_DataRepresentationIdSeq	value
	Sequence of representation identifiers.

Detailed Description

This QoS policy contains a list of representation identifiers used by DDSDataWriter and DDSDataReader entities to negotiate which data representation to use.

Entity:

DDSTopic, DDSDataReader, DDSDataWriter

Status:

DDS_OFFERED_INCOMPATIBLE_QOS_STATUS, DDS_REQUESTED_INCOMPATIBLE_QOS_STATUS

Properties:

RxO = YES
Changeable = UNTIL ENABLE

See also

DATA_REPRESENTATION

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

Member Data Documentation

value

struct DDS_DataRepresentationIdSeq DDS_DataRepresentationQosPolicy::value

Sequence of representation identifiers.

[default] For DDSTopic, DDSDataWriter, and DDSDataReader, a list with one element: DDS_AUTO_DATA_REPRESENTATION.

Note

An empty sequence is equivalent to a list with one element: DDS_XCDR_DATA_REPRESENTATION.