pub trait ExclusiveSystemParam: Sized {
type State: Send + Sync + 'static;
type Item<'s>: ExclusiveSystemParam<State = Self::State>;
// Required methods
fn init(world: &mut World, system_meta: &mut SystemMeta) -> Self::State;
fn get_param<'s>(
state: &'s mut Self::State,
system_meta: &SystemMeta,
) -> Self::Item<'s>;
}Expand description
A parameter that can be used in an exclusive system (a system with an &mut World parameter).
Any parameters implementing this trait must come after the &mut World parameter.
Required Associated Types§
Sourcetype State: Send + Sync + 'static
type State: Send + Sync + 'static
Used to store data which persists across invocations of a system.
Sourcetype Item<'s>: ExclusiveSystemParam<State = Self::State>
type Item<'s>: ExclusiveSystemParam<State = Self::State>
The item type returned when constructing this system param.
See SystemParam::Item.
Required Methods§
Sourcefn init(world: &mut World, system_meta: &mut SystemMeta) -> Self::State
fn init(world: &mut World, system_meta: &mut SystemMeta) -> Self::State
Creates a new instance of this param’s State.
Sourcefn get_param<'s>(
state: &'s mut Self::State,
system_meta: &SystemMeta,
) -> Self::Item<'s>
fn get_param<'s>( state: &'s mut Self::State, system_meta: &SystemMeta, ) -> Self::Item<'s>
Creates a parameter to be passed into an ExclusiveSystemParamFunction.
Dyn Compatibility§
This trait is not dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.