Classes
class	DataState
	Information about a sample's SampleState, ViewState, and InstanceState. More...

class	DataStateOperations
	Extensions for SampleState, ViewState and InstanceState that allow combining them to form a DataState More...

struct	GenerationCount
	Keeps track of changes in InstanceState. More...

struct	Rank
	Keeps track of the number of samples related to the same instance that follow in a sample collection. More...

Enumerations
enum class	SampleState { None , Read , NotRead , Any }
	Indicates whether or not a sample has ever been read. More...

enum class	ViewState { None , New , NotNew , Any }
	Indicates whether or not an instance is new. More...

enum class	InstanceState { None , Alive , NotAliveDisposed , NotAliveNoWriters , NotAlive , Any }
	Indicates if the samples are from a live DataWriter or not. More...

Enumeration Type Documentation

◆ InstanceState

strong

Indicates if the samples are from a live DataWriter or not.

The full documentation is available in the C API: DDS_InstanceStateKind

Enumerator
None	Mask where no flag is selected
Alive	Indicates that the instance is currently in existence.
NotAliveDisposed	Indicates that the instance has been disposed by a DataWriter.
NotAliveNoWriters	Indicates that none of the DataWriters that are currently alive (according to the Liveliness QoS policy) are writing this instance.
NotAlive	Mask containing the NotAliveDisposed and NotAliveNoWriters flags.
Any	Mask containing all flags.

strong

Indicates whether or not a sample has ever been read.

The full documentation is available in the C API: DDS_SampleStateKind

Enumerator
None	Mask where no flag is selected.
Read	Indicates that the application has already accessed that sample by means of a read or take operation.
NotRead	Indicates that the application has not accessed that sample before.
Any	A mask containing all flags.

strong

Indicates whether or not an instance is new.

The full documentation is available in the C API: DDS_ViewStateKind

Enumerator
None	Mask where no flag is selected
New	Indicates that the latest generation of an instance has not previously been accessed.
NotNew	Indicates that the latest generation of an instance has previously been accessed.
Any	Mask containing all flags