Struct bevy::ecs::system::SystemChangeTick

pub struct SystemChangeTick { /* private fields */ }

A SystemParam that reads the previous and current change ticks of the system.

A system’s change ticks are updated each time it runs:

• last_change_tick copies the previous value of change_tick
• change_tick copies the current value of World::read_change_tick

Component change ticks that are more recent than last_change_tick will be detected by the system. Those can be read by calling last_changed on a Mut<T> or ResMut<T>.

Implementations

impl SystemChangeTick

pub fn change_tick(&self) -> u32

Returns the current World change tick seen by the system.

pub fn last_change_tick(&self) -> u32

Returns the World change tick seen by the system the previous time it ran.

Trait Implementations

impl Debug for SystemChangeTick

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

Formats the value using the given formatter.

impl SystemParam for SystemChangeTick

type Fetch = SystemChangeTickState