pub struct Archetypes { /* private fields */ }
Expand description

The backing store of all Archetypes within a World.

For more information, see the module level documentation.

Implementations§

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impl Archetypes

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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.

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pub fn len(&self) -> usize

Fetches the total number of Archetypes within the world.

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pub fn empty(&self) -> &Archetype

Fetches an immutable reference to the archetype without any components.

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

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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.

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

Returns a read-only iterator over all archetypes.

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pub fn archetype_components_len(&self) -> usize

Returns the number of components that are stored in archetypes. Note that if some component T is stored in more than one archetype, it will be counted once for each archetype it’s present in.

Trait Implementations§

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impl Index<ArchetypeId> for Archetypes

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type Output = Archetype

The returned type after indexing.
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fn index( &self, index: ArchetypeId ) -> &<Archetypes as Index<ArchetypeId>>::Output

Performs the indexing (container[index]) operation. Read more
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impl Index<RangeFrom<ArchetypeGeneration>> for Archetypes

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type Output = [Archetype]

The returned type after indexing.
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fn index( &self, index: RangeFrom<ArchetypeGeneration> ) -> &<Archetypes as Index<RangeFrom<ArchetypeGeneration>>>::Output

Performs the indexing (container[index]) operation. Read more
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impl IndexMut<ArchetypeId> for Archetypes

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

Performs the mutable indexing (container[index]) operation. Read more
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impl<'a> SystemParam for &'a Archetypes

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type State = ()

Used to store data which persists across invocations of a system.
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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. Read more
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fn init_state( _world: &mut World, _system_meta: &mut SystemMeta ) -> <&'a Archetypes as SystemParam>::State

Registers any World access used by this SystemParam and creates a new instance of this param’s State.
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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. Read more
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fn new_archetype( _state: &mut Self::State, _archetype: &Archetype, _system_meta: &mut SystemMeta )

For the specified Archetype, registers the components accessed by this SystemParam (if applicable).
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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 apply_deferred.
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impl<'a> ReadOnlySystemParam for &'a Archetypes

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impl<T> Any for T
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Gets the TypeId of self. Read more
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