Trait SystemParam 

pub trait SystemParam: 'static {
    type Item;

    // Required method
    fn fetch(world: &mut State) -> Self::Item;
}

Abstraction of a parameter for a system function

Required Associated Types

type Item

Required Methods

fn fetch(world: &mut State) -> Self::Item

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.

Implementations on Foreign Types

impl SystemParam for ()

type Item = ()

fn fetch(_world: &mut State) -> Self::Item

impl<T1> SystemParam for (T1,)

where T1: SystemParam,

implement one parameter for a SystemParam

type Item = (<T1 as SystemParam>::Item,)

fn fetch(world: &mut State) -> Self::Item

impl<T1, T2> SystemParam for (T1, T2)

where T1: SystemParam, T2: SystemParam,

implement two parameters for a SystemParam

type Item = (<T1 as SystemParam>::Item, <T2 as SystemParam>::Item)

fn fetch(world: &mut State) -> Self::Item

impl<T1, T2, T3> SystemParam for (T1, T2, T3)

where T1: SystemParam, T2: SystemParam, T3: SystemParam,

implement three parameters for a SystemParam

type Item = (<T1 as SystemParam>::Item, <T2 as SystemParam>::Item, <T3 as SystemParam>::Item)

fn fetch(world: &mut State) -> Self::Item

impl<T1, T2, T3, T4> SystemParam for (T1, T2, T3, T4)

where T1: SystemParam, T2: SystemParam, T3: SystemParam, T4: SystemParam,

implement four parameters for a SystemParam

type Item = (<T1 as SystemParam>::Item, <T2 as SystemParam>::Item, <T3 as SystemParam>::Item, <T4 as SystemParam>::Item)

fn fetch(world: &mut State) -> Self::Item

impl<T1, T2, T3, T4, T5> SystemParam for (T1, T2, T3, T4, T5)

where T1: SystemParam, T2: SystemParam, T3: SystemParam, T4: SystemParam, T5: SystemParam,

implement five parameters for a SystemParam

type Item = (<T1 as SystemParam>::Item, <T2 as SystemParam>::Item, <T3 as SystemParam>::Item, <T4 as SystemParam>::Item, <T5 as SystemParam>::Item)

fn fetch(world: &mut State) -> Self::Item

impl<T1, T2, T3, T4, T5, T6> SystemParam for (T1, T2, T3, T4, T5, T6)

where T1: SystemParam, T2: SystemParam, T3: SystemParam, T4: SystemParam, T5: SystemParam, T6: SystemParam,

implement six parameters for a SystemParam

type Item = (<T1 as SystemParam>::Item, <T2 as SystemParam>::Item, <T3 as SystemParam>::Item, <T4 as SystemParam>::Item, <T5 as SystemParam>::Item, <T6 as SystemParam>::Item)

fn fetch(world: &mut State) -> Self::Item

impl<T1, T2, T3, T4, T5, T6, T7> SystemParam for (T1, T2, T3, T4, T5, T6, T7)

where T1: SystemParam, T2: SystemParam, T3: SystemParam, T4: SystemParam, T5: SystemParam, T6: SystemParam, T7: SystemParam,

implement seven parameters for a SystemParam

type Item = (<T1 as SystemParam>::Item, <T2 as SystemParam>::Item, <T3 as SystemParam>::Item, <T4 as SystemParam>::Item, <T5 as SystemParam>::Item, <T6 as SystemParam>::Item, <T7 as SystemParam>::Item)

fn fetch(world: &mut State) -> Self::Item

impl<T1, T2, T3, T4, T5, T6, T7, T8> SystemParam for (T1, T2, T3, T4, T5, T6, T7, T8)

where T1: SystemParam, T2: SystemParam, T3: SystemParam, T4: SystemParam, T5: SystemParam, T6: SystemParam, T7: SystemParam, T8: SystemParam,

implement seven parameters for a SystemParam

type Item = (<T1 as SystemParam>::Item, <T2 as SystemParam>::Item, <T3 as SystemParam>::Item, <T4 as SystemParam>::Item, <T5 as SystemParam>::Item, <T6 as SystemParam>::Item, <T7 as SystemParam>::Item, <T8 as SystemParam>::Item)

fn fetch(world: &mut State) -> Self::Item

Implementors