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:
last_run
copies the previous value ofchange_tick
this_run
copies the current value ofWorld::read_change_tick
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>
.
Implementations§
Trait Implementations§
Source§impl Debug for SystemChangeTick
impl Debug for SystemChangeTick
Source§impl SystemParam for SystemChangeTick
impl SystemParam for SystemChangeTick
Source§type Item<'w, 's> = SystemChangeTick
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 moreSource§fn init_state(_world: &mut World, _system_meta: &mut SystemMeta) -> Self::State
fn init_state(_world: &mut World, _system_meta: &mut SystemMeta) -> Self::State
Registers any
World
access used by this SystemParam
and creates a new instance of this param’s State
.Source§unsafe fn get_param<'w, 's>(
_state: &'s mut Self::State,
system_meta: &SystemMeta,
_world: UnsafeWorldCell<'w>,
change_tick: Tick,
) -> Self::Item<'w, 's>
unsafe fn get_param<'w, 's>( _state: &'s mut Self::State, system_meta: &SystemMeta, _world: UnsafeWorldCell<'w>, change_tick: Tick, ) -> Self::Item<'w, 's>
Creates a parameter to be passed into a
SystemParamFunction
. Read moreSource§unsafe fn new_archetype(
state: &mut Self::State,
archetype: &Archetype,
system_meta: &mut SystemMeta,
)
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 moreSource§fn apply(state: &mut Self::State, system_meta: &SystemMeta, world: &mut World)
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
.Source§fn queue(
state: &mut Self::State,
system_meta: &SystemMeta,
world: DeferredWorld<'_>,
)
fn queue( state: &mut Self::State, system_meta: &SystemMeta, world: DeferredWorld<'_>, )
Queues any deferred mutations to be applied at the next
apply_deferred
.impl ReadOnlySystemParam for SystemChangeTick
Auto Trait Implementations§
impl Freeze for SystemChangeTick
impl RefUnwindSafe for SystemChangeTick
impl Send for SystemChangeTick
impl Sync for SystemChangeTick
impl Unpin for SystemChangeTick
impl UnwindSafe for SystemChangeTick
Blanket Implementations§
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
Source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more