Struct NonSendMarker 

pub struct NonSendMarker(/* private fields */);

A dummy type that is !Send, to force systems to run on the main thread.

Trait Implementations

impl SystemParam for NonSendMarker

type State = ()

Used to store data which persists across invocations of a system.

type Item<'w, 's> = NonSendMarker

The item type returned when constructing this system param. The value of this associated type should be Self, instantiated with new lifetimes.

fn init_state(_world: &mut World) -> Self::State

Creates a new instance of this param’s State.

fn init_access( _state: &Self::State, system_meta: &mut SystemMeta, _component_access_set: &mut FilteredAccessSet, _world: &mut World, )

Registers any World access used by this SystemParam

unsafe fn get_param<'world, 'state>( _state: &'state mut Self::State, _system_meta: &SystemMeta, _world: UnsafeWorldCell<'world>, _change_tick: Tick, ) -> Self::Item<'world, 'state>

Creates a parameter to be passed into a SystemParamFunction.

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 ApplyDeferred.

fn queue( state: &mut Self::State, system_meta: &SystemMeta, world: DeferredWorld<'_>, )

Queues any deferred mutations to be applied at the next ApplyDeferred.

unsafe fn validate_param( state: &mut Self::State, system_meta: &SystemMeta, world: UnsafeWorldCell<'_>, ) -> Result<(), SystemParamValidationError>

Validates that the param can be acquired by the get_param.

impl ReadOnlySystemParam for NonSendMarker