Struct Archetypes 

pub struct Archetypes { /* private fields */ }

The backing store of all Archetypes within a World.

For more information, see the module level documentation.

Implementations

impl Archetypes

pub fn generation(&self) -> ArchetypeGeneration

Returns the “generation”, a handle to the current highest archetype ID.

This can be used with the Index Archetypes implementation to iterate over newly introduced Archetypes since the last time this function was called.

pub fn len(&self) -> usize

Fetches the total number of Archetypes within the world.

pub fn empty(&self) -> &Archetype

Fetches an immutable reference to the archetype without any components.

Shorthand for archetypes.get(ArchetypeId::EMPTY).unwrap()

pub fn get(&self, id: ArchetypeId) -> Option<&Archetype>

Fetches an immutable reference to an Archetype using its ID. Returns None if no corresponding archetype exists.

pub fn iter(&self) -> impl Iterator<Item = &Archetype>

Returns a read-only iterator over all archetypes.

Trait Implementations

impl Index<ArchetypeId> for Archetypes

type Output = Archetype

The returned type after indexing.

fn index( &self, index: ArchetypeId, ) -> &<Archetypes as Index<ArchetypeId>>::Output

Performs the indexing (container[index]) operation.

impl Index<RangeFrom<ArchetypeGeneration>> for Archetypes

type Output = [Archetype]

The returned type after indexing.

fn index( &self, index: RangeFrom<ArchetypeGeneration>, ) -> &<Archetypes as Index<RangeFrom<ArchetypeGeneration>>>::Output

Performs the indexing (container[index]) operation.

impl IndexMut<ArchetypeId> for Archetypes

fn index_mut( &mut self, index: ArchetypeId, ) -> &mut <Archetypes as Index<ArchetypeId>>::Output

Performs the mutable indexing (container[index]) operation.

impl<'a> SystemParam for &'a Archetypes

type State = ()

Used to store data which persists across invocations of a system.

type Item<'w, 's> = &'w Archetypes

The item type returned when constructing this system param. The value of this associated type should be Self, instantiated with new lifetimes.

fn init_state(_world: &mut World) -> <&'a Archetypes as SystemParam>::State

Creates a new instance of this param’s State.

fn init_access( _state: &<&'a Archetypes as SystemParam>::State, _system_meta: &mut SystemMeta, _component_access_set: &mut FilteredAccessSet, _world: &mut World, )

Registers any World access used by this SystemParam

unsafe fn get_param<'w, 's>( _state: &'s mut <&'a Archetypes as SystemParam>::State, _system_meta: &SystemMeta, world: UnsafeWorldCell<'w>, _change_tick: Tick, ) -> <&'a Archetypes as SystemParam>::Item<'w, 's>

Creates a parameter to be passed into a SystemParamFunction.

fn apply(state: &mut Self::State, system_meta: &SystemMeta, world: &mut World)

Applies any deferred mutations stored in this SystemParam’s state. This is used to apply Commands during ApplyDeferred.

fn queue( state: &mut Self::State, system_meta: &SystemMeta, world: DeferredWorld<'_>, )

Queues any deferred mutations to be applied at the next ApplyDeferred.

unsafe fn validate_param( state: &mut Self::State, system_meta: &SystemMeta, world: UnsafeWorldCell<'_>, ) -> Result<(), SystemParamValidationError>

Validates that the param can be acquired by the get_param.

impl<'a> ReadOnlySystemParam for &'a Archetypes