Enum TimerClockSource 

#[repr(u8)]
pub enum TimerClockSource {
    Steady = 0,
    Ros = 1,
    System = 2,
}

Which clock advances a timer (phase-425 W4, RFC-0075-adjacent: this is the distinction rclcpp draws between create_wall_timer and create_timer).

The default is Steady and it is the only source that costs nothing: it consumes the spin delta the executor already measured. The other two READ a clock on every poll of the timer, which is one relaxed atomic load plus whatever the platform’s time call costs.

Variants

Steady = 0

The executor’s monotonic spin delta — a WALL timer in rclcpp’s sense. Unaffected by /clock: a paused simulator does not pause it, which is exactly what a watchdog or a transport keep-alive wants.

Ros = 1

ClockType::RosTime: simulated time when a /clock source is active, and system time when none is (the same fallback rclcpp::Clock has, so a node built for simulation still runs standalone).

System = 2

ClockType::SystemTime: the wall clock, NTP steps and all. Present because rclrs offers it (TimerClock::SystemTime); a timer that must not jump wants Steady.

Trait Implementations

impl Clone for TimerClockSource

fn clone(&self) -> TimerClockSource

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TimerClockSource

impl Debug for TimerClockSource

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

Formats the value using the given formatter.

impl Default for TimerClockSource

fn default() -> TimerClockSource

Returns the “default value” for a type.

impl Eq for TimerClockSource

impl PartialEq for TimerClockSource

fn eq(&self, other: &TimerClockSource) -> 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 StructuralPartialEq for TimerClockSource