Trait QuerySpecMut 

pub trait QuerySpecMut {
    type Item<'w>;
    type State<'w>;

    // Required methods
    fn matches(layout: &ArchetypeLayout) -> bool;
    fn init_state<'w>(
        archetype: &'w mut Archetype,
        tick: u64,
    ) -> Option<Self::State<'w>>;
    fn len(state: &Self::State<'_>) -> usize;
    fn entity(state: &Self::State<'_>, row: usize) -> Entity;
    unsafe fn fetch<'w>(
        state: &mut Self::State<'w>,
        row: usize,
    ) -> Self::Item<'w>;
}

Describes a mutable query fetch over matching archetypes.

Required Associated Types

type Item<'w>

type State<'w>

Required Methods

fn matches(layout: &ArchetypeLayout) -> bool

fn init_state<'w>( archetype: &'w mut Archetype, tick: u64, ) -> Option<Self::State<'w>>

fn len(state: &Self::State<'_>) -> usize

fn entity(state: &Self::State<'_>, row: usize) -> Entity

unsafe fn fetch<'w>(state: &mut Self::State<'w>, row: usize) -> Self::Item<'w>

Safety

Callers must only request each row at most once per live state. Doing otherwise could create aliased mutable references into the same archetype column data.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<A: Component, B: Component, C: Component> QuerySpecMut for (&mut A, &mut B, &mut C)

type Item<'w> = (Mut<'w, A>, Mut<'w, B>, Mut<'w, C>)

type State<'w> = TripleMutState<'w, A, B, C>

fn matches(layout: &ArchetypeLayout) -> bool

fn init_state<'w>( archetype: &'w mut Archetype, tick: u64, ) -> Option<Self::State<'w>>

fn len(state: &Self::State<'_>) -> usize

fn entity(state: &Self::State<'_>, row: usize) -> Entity

unsafe fn fetch<'w>(state: &mut Self::State<'w>, row: usize) -> Self::Item<'w>

impl<A: Component, B: Component> QuerySpecMut for (&mut A, &mut B)

type Item<'w> = (Mut<'w, A>, Mut<'w, B>)

type State<'w> = PairMutState<'w, A, B>

fn matches(layout: &ArchetypeLayout) -> bool

fn init_state<'w>( archetype: &'w mut Archetype, tick: u64, ) -> Option<Self::State<'w>>

fn len(state: &Self::State<'_>) -> usize

fn entity(state: &Self::State<'_>, row: usize) -> Entity

unsafe fn fetch<'w>(state: &mut Self::State<'w>, row: usize) -> Self::Item<'w>

impl<A: Component, B: Component> QuerySpecMut for (&mut A, Option<&mut B>)

type Item<'w> = (Mut<'w, A>, Option<Mut<'w, B>>)

type State<'w> = PairMutOptionalState<'w, A, B>

fn matches(layout: &ArchetypeLayout) -> bool

fn init_state<'w>( archetype: &'w mut Archetype, tick: u64, ) -> Option<Self::State<'w>>

fn len(state: &Self::State<'_>) -> usize

fn entity(state: &Self::State<'_>, row: usize) -> Entity

unsafe fn fetch<'w>(state: &mut Self::State<'w>, row: usize) -> Self::Item<'w>

impl<T: Component> QuerySpecMut for &mut T

type Item<'w> = Mut<'w, T>

type State<'w> = SingleMutState<'w, T>

fn matches(layout: &ArchetypeLayout) -> bool

fn init_state<'w>( archetype: &'w mut Archetype, tick: u64, ) -> Option<Self::State<'w>>

fn len(state: &Self::State<'_>) -> usize

fn entity(state: &Self::State<'_>, row: usize) -> Entity

unsafe fn fetch<'w>(state: &mut Self::State<'w>, row: usize) -> Self::Item<'w>

impl<T: Component> QuerySpecMut for Option<&mut T>

Optional mutable query: matches all archetypes (never filters), returns Some(&mut T) when the column is present and None when absent.

type Item<'w> = Option<Mut<'w, T>>

type State<'w> = OptionalMutState<'w, T>

fn matches(_layout: &ArchetypeLayout) -> bool

fn init_state<'w>( archetype: &'w mut Archetype, tick: u64, ) -> Option<Self::State<'w>>

fn len(state: &Self::State<'_>) -> usize

fn entity(state: &Self::State<'_>, row: usize) -> Entity

unsafe fn fetch<'w>(state: &mut Self::State<'w>, row: usize) -> Self::Item<'w>

Implementors