Trait WorldQuery 

pub trait WorldQuery: 'static {
    type Item<'w>;

    // Required methods
    fn required_types() -> Vec<TypeId>;
    fn matches(arch: &Archetype) -> bool;
    unsafe fn fetch<'w>(arch: &'w Archetype, row: usize) -> Self::Item<'w>;
}

Trait for types that describe how to fetch data from an archetype row.

Required Associated Types

type Item<'w>

The type yielded per entity.

Required Methods

fn required_types() -> Vec<TypeId>

Required component TypeIds (must all be present in the archetype).

fn matches(arch: &Archetype) -> bool

true if arch satisfies this query.

unsafe fn fetch<'w>(arch: &'w Archetype, row: usize) -> Self::Item<'w>

Fetches the item for row in arch.

Safety

row must be valid; aliasing rules must be upheld by the caller.

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: WorldQuery> WorldQuery for (A,)

type Item<'w> = (<A as WorldQuery>::Item<'w>,)

fn required_types() -> Vec<TypeId>

fn matches(a: &Archetype) -> bool

unsafe fn fetch<'w>(a: &'w Archetype, row: usize) -> (A::Item<'w>,)

impl<A: WorldQuery, B: WorldQuery> WorldQuery for (A, B)

type Item<'w> = (<A as WorldQuery>::Item<'w>, <B as WorldQuery>::Item<'w>)

fn required_types() -> Vec<TypeId>

fn matches(a: &Archetype) -> bool

unsafe fn fetch<'w>(a: &'w Archetype, row: usize) -> (A::Item<'w>, B::Item<'w>)

impl<A: WorldQuery, B: WorldQuery, C: WorldQuery> WorldQuery for (A, B, C)

type Item<'w> = (<A as WorldQuery>::Item<'w>, <B as WorldQuery>::Item<'w>, <C as WorldQuery>::Item<'w>)

fn required_types() -> Vec<TypeId>

fn matches(a: &Archetype) -> bool

unsafe fn fetch<'w>( a: &'w Archetype, row: usize, ) -> (A::Item<'w>, B::Item<'w>, C::Item<'w>)

impl<A: WorldQuery, B: WorldQuery, C: WorldQuery, D: WorldQuery> WorldQuery for (A, B, C, D)

type Item<'w> = (<A as WorldQuery>::Item<'w>, <B as WorldQuery>::Item<'w>, <C as WorldQuery>::Item<'w>, <D as WorldQuery>::Item<'w>)

fn required_types() -> Vec<TypeId>

fn matches(a: &Archetype) -> bool

unsafe fn fetch<'w>( a: &'w Archetype, row: usize, ) -> (A::Item<'w>, B::Item<'w>, C::Item<'w>, D::Item<'w>)

impl<A: WorldQuery, B: WorldQuery, C: WorldQuery, D: WorldQuery, E: WorldQuery> WorldQuery for (A, B, C, D, E)

type Item<'w> = (<A as WorldQuery>::Item<'w>, <B as WorldQuery>::Item<'w>, <C as WorldQuery>::Item<'w>, <D as WorldQuery>::Item<'w>, <E as WorldQuery>::Item<'w>)

fn required_types() -> Vec<TypeId>

fn matches(a: &Archetype) -> bool

unsafe fn fetch<'w>( a: &'w Archetype, row: usize, ) -> (A::Item<'w>, B::Item<'w>, C::Item<'w>, D::Item<'w>, E::Item<'w>)

impl<A: WorldQuery, B: WorldQuery, C: WorldQuery, D: WorldQuery, E: WorldQuery, F: WorldQuery> WorldQuery for (A, B, C, D, E, F)

type Item<'w> = (<A as WorldQuery>::Item<'w>, <B as WorldQuery>::Item<'w>, <C as WorldQuery>::Item<'w>, <D as WorldQuery>::Item<'w>, <E as WorldQuery>::Item<'w>, <F as WorldQuery>::Item<'w>)

fn required_types() -> Vec<TypeId>

fn matches(a: &Archetype) -> bool

unsafe fn fetch<'w>( a: &'w Archetype, row: usize, ) -> (A::Item<'w>, B::Item<'w>, C::Item<'w>, D::Item<'w>, E::Item<'w>, F::Item<'w>)

impl<A: WorldQuery, B: WorldQuery, C: WorldQuery, D: WorldQuery, E: WorldQuery, F: WorldQuery, G: WorldQuery> WorldQuery for (A, B, C, D, E, F, G)

type Item<'w> = (<A as WorldQuery>::Item<'w>, <B as WorldQuery>::Item<'w>, <C as WorldQuery>::Item<'w>, <D as WorldQuery>::Item<'w>, <E as WorldQuery>::Item<'w>, <F as WorldQuery>::Item<'w>, <G as WorldQuery>::Item<'w>)

fn required_types() -> Vec<TypeId>

fn matches(a: &Archetype) -> bool

unsafe fn fetch<'w>( a: &'w Archetype, row: usize, ) -> (A::Item<'w>, B::Item<'w>, C::Item<'w>, D::Item<'w>, E::Item<'w>, F::Item<'w>, G::Item<'w>)

impl<A: WorldQuery, B: WorldQuery, C: WorldQuery, D: WorldQuery, E: WorldQuery, F: WorldQuery, G: WorldQuery, H: WorldQuery> WorldQuery for (A, B, C, D, E, F, G, H)

type Item<'w> = (<A as WorldQuery>::Item<'w>, <B as WorldQuery>::Item<'w>, <C as WorldQuery>::Item<'w>, <D as WorldQuery>::Item<'w>, <E as WorldQuery>::Item<'w>, <F as WorldQuery>::Item<'w>, <G as WorldQuery>::Item<'w>, <H as WorldQuery>::Item<'w>)

fn required_types() -> Vec<TypeId>

fn matches(a: &Archetype) -> bool

unsafe fn fetch<'w>( a: &'w Archetype, row: usize, ) -> (A::Item<'w>, B::Item<'w>, C::Item<'w>, D::Item<'w>, E::Item<'w>, F::Item<'w>, G::Item<'w>, H::Item<'w>)

Implementors

impl WorldQuery for Entity

type Item<'w> = Entity

impl<T: Component> WorldQuery for OptionRead<T>

type Item<'w> = Option<&'w T>

impl<T: Component> WorldQuery for Read<T>

type Item<'w> = &'w T

impl<T: Component> WorldQuery for Write<T>

type Item<'w> = &'w mut T