Trait ResourceQuery

pub trait ResourceQuery {
    type Item<'r>;
    type State<'s>: QueryState<'s>;

    // Required method
    fn query<'r, 's>(
        resources: &'r Resources,
        state: Self::State<'s>,
    ) -> Option<Self::Item<'r>>;
}

Required Associated Types

type Item<'r>

type State<'s>: QueryState<'s>

Required Methods

fn query<'r, 's>( resources: &'r Resources, state: Self::State<'s>, ) -> Option<Self::Item<'r>>

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<'a, R: Resource> ResourceQuery for &'a R

type Item<'r> = &'r R

type State<'s> = EphemeralQueryState<'s>

fn query<'r, 's>( resources: &'r Resources, _state: Self::State<'s>, ) -> Option<Self::Item<'r>>

impl<R1: ResourceQuery> ResourceQuery for (R1,)

type Item<'r> = (<R1 as ResourceQuery>::Item<'r>,)

type State<'s> = EphemeralQueryState<'s>

fn query<'r, 's>( resources: &'r Resources, state: Self::State<'s>, ) -> Option<Self::Item<'r>>

impl<R1: ResourceQuery, R2: ResourceQuery> ResourceQuery for (R1, R2)

type Item<'r> = (<R1 as ResourceQuery>::Item<'r>, <R2 as ResourceQuery>::Item<'r>)

type State<'s> = EphemeralQueryState<'s>

fn query<'r, 's>( resources: &'r Resources, state: Self::State<'s>, ) -> Option<Self::Item<'r>>

impl<R1: ResourceQuery, R2: ResourceQuery, R3: ResourceQuery> ResourceQuery for (R1, R2, R3)

type Item<'r> = (<R1 as ResourceQuery>::Item<'r>, <R2 as ResourceQuery>::Item<'r>, <R3 as ResourceQuery>::Item<'r>)

type State<'s> = EphemeralQueryState<'s>

fn query<'r, 's>( resources: &'r Resources, state: Self::State<'s>, ) -> Option<Self::Item<'r>>

impl<R1: ResourceQuery, R2: ResourceQuery, R3: ResourceQuery, R4: ResourceQuery> ResourceQuery for (R1, R2, R3, R4)

type Item<'r> = (<R1 as ResourceQuery>::Item<'r>, <R2 as ResourceQuery>::Item<'r>, <R3 as ResourceQuery>::Item<'r>, <R4 as ResourceQuery>::Item<'r>)

type State<'s> = EphemeralQueryState<'s>

fn query<'r, 's>( resources: &'r Resources, state: Self::State<'s>, ) -> Option<Self::Item<'r>>

impl<R1: ResourceQuery, R2: ResourceQuery, R3: ResourceQuery, R4: ResourceQuery, R5: ResourceQuery> ResourceQuery for (R1, R2, R3, R4, R5)

type Item<'r> = (<R1 as ResourceQuery>::Item<'r>, <R2 as ResourceQuery>::Item<'r>, <R3 as ResourceQuery>::Item<'r>, <R4 as ResourceQuery>::Item<'r>, <R5 as ResourceQuery>::Item<'r>)

type State<'s> = EphemeralQueryState<'s>

fn query<'r, 's>( resources: &'r Resources, state: Self::State<'s>, ) -> Option<Self::Item<'r>>

impl<R1: ResourceQuery, R2: ResourceQuery, R3: ResourceQuery, R4: ResourceQuery, R5: ResourceQuery, R6: ResourceQuery> ResourceQuery for (R1, R2, R3, R4, R5, R6)

type Item<'r> = (<R1 as ResourceQuery>::Item<'r>, <R2 as ResourceQuery>::Item<'r>, <R3 as ResourceQuery>::Item<'r>, <R4 as ResourceQuery>::Item<'r>, <R5 as ResourceQuery>::Item<'r>, <R6 as ResourceQuery>::Item<'r>)

type State<'s> = EphemeralQueryState<'s>

fn query<'r, 's>( resources: &'r Resources, state: Self::State<'s>, ) -> Option<Self::Item<'r>>

Implementors