Struct bevy::ecs::system::SystemChangeTick

pub struct SystemChangeTick { /* private fields */ }
Expand description

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

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

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

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impl SystemChangeTick

pub fn this_run(&self) -> Tick

Returns the current World change tick seen by the system.

pub fn last_run(&self) -> Tick

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

Trait Implementations§

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impl Debug for SystemChangeTick

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

Formats the value using the given formatter. Read more
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impl SystemParam for SystemChangeTick

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type State = ()

Used to store data which persists across invocations of a system.
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type Item<'w, 's> = SystemChangeTick

The item type returned when constructing this system param. The value of this associated type should be Self, instantiated with new lifetimes. Read more
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fn init_state( _world: &mut World, _system_meta: &mut SystemMeta, ) -> <SystemChangeTick as SystemParam>::State

Registers any World access used by this SystemParam and creates a new instance of this param’s State.
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unsafe fn get_param<'w, 's>( _state: &'s mut <SystemChangeTick as SystemParam>::State, system_meta: &SystemMeta, _world: UnsafeWorldCell<'w>, change_tick: Tick, ) -> <SystemChangeTick as SystemParam>::Item<'w, 's>

Creates a parameter to be passed into a SystemParamFunction. Read more
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unsafe fn new_archetype( state: &mut Self::State, archetype: &Archetype, system_meta: &mut SystemMeta, )

For the specified Archetype, registers the components accessed by this SystemParam (if applicable).a Read more
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fn apply(state: &mut Self::State, system_meta: &SystemMeta, world: &mut World)

Applies any deferred mutations stored in this SystemParam’s state. This is used to apply Commands during apply_deferred.
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fn queue( state: &mut Self::State, system_meta: &SystemMeta, world: DeferredWorld<'_>, )

Queues any deferred mutations to be applied at the next apply_deferred.
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impl ReadOnlySystemParam for SystemChangeTick

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