Struct NotAliveGenerationCounts

pub struct NotAliveGenerationCounts {
    pub disposed_generation_count: i32,
    pub no_writers_generation_count: i32,
}

A double counter for counting how many times an instance as become Alive.

For each instance the middleware internally maintains two counts: the disposed_generation_count and no_writers_generation_count, relative to each DataReader:

The disposed_generation_count and no_writers_generation_count are initialized to zero when the DataReader first detects the presence of a never-seen-before instance.

The disposed_generation_count is incremented each time the instance_state of the corresponding instance changes from NOT_ALIVE_DISPOSED to ALIVE.

The no_writers_generation_count is incremented each time the instance_state of the corresponding instance changes from NOT_ALIVE_NO_WRITERS to ALIVE. The disposed_generation_count and no_writers_generation_count available in the SampleInfo capture a snapshot of the corresponding counters at the time the sample was received.

See DDS spec v1.4 Section “2.2.2.5.1.5 Interpretation of the SampleInfo disposed_generation_count and no_writers_generation_count”

Fields

disposed_generation_count: i32

no_writers_generation_count: i32

Implementations

impl NotAliveGenerationCounts

pub fn zero() -> Self

Initial count value

pub fn sub_zero() -> Self

Marker value for “never accessed”

pub fn total(&self) -> i32

Trait Implementations

impl Clone for NotAliveGenerationCounts

fn clone(&self) -> NotAliveGenerationCounts

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for NotAliveGenerationCounts

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for NotAliveGenerationCounts

fn eq(&self, other: &NotAliveGenerationCounts) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for NotAliveGenerationCounts

impl Eq for NotAliveGenerationCounts

impl StructuralPartialEq for NotAliveGenerationCounts