DDS::SampleStateKind Struct Reference

Indicates whether or not a sample has ever been read. More...

#include <managed_subscription.h>

Properties
static SampleStateKind	READ_SAMPLE_STATE [get]
	Sample has been read. More...
static SampleStateKind	NOT_READ_SAMPLE_STATE [get]
	Sample has not been read. More...
static SampleStateKind	ANY_SAMPLE_STATE [get]
	Any sample state DDS::SampleStateKind::READ_SAMPLE_STATE | DDS::SampleStateKind::NOT_READ_SAMPLE_STATE. More...

Detailed Description

Indicates whether or not a sample has ever been read.

For each sample received, the middleware internally maintains a sample_state relative to each DDS::DataReader. The sample state can be either:

• DDS::SampleStateKind::READ_SAMPLE_STATE indicates that the DDS::DataReader has already accessed that sample by means of a read or take operation.

• DDS::SampleStateKind::NOT_READ_SAMPLE_STATE indicates that the DDS::DataReader has not accessed that sample before.

The sample state will, in general, be different for each sample in the collection returned by read or take.

Property Documentation

READ_SAMPLE_STATE

SampleStateKind DDS::SampleStateKind::READ_SAMPLE_STATE

staticget

Sample has been read.

NOT_READ_SAMPLE_STATE

SampleStateKind DDS::SampleStateKind::NOT_READ_SAMPLE_STATE

staticget

Sample has not been read.