Trait bevy_internal::ecs::query::FetchState [−][src]
pub unsafe trait FetchState: Send + Sync {
fn init(world: &mut World) -> Self;
fn update_component_access(&self, access: &mut FilteredAccess<ComponentId>);
fn update_archetype_component_access(
&self,
archetype: &Archetype,
access: &mut Access<ArchetypeComponentId>
);
fn matches_archetype(&self, archetype: &Archetype) -> bool;
fn matches_table(&self, table: &Table) -> bool;
}Expand description
State used to construct a Fetch. This will be cached inside QueryState,
so it is best to move as much data / computation here as possible to reduce the cost of
constructing Fetch.
Safety
Implementor must ensure that FetchState::update_component_access and
FetchState::update_archetype_component_access exactly reflects the results of
FetchState::matches_archetype, FetchState::matches_table, Fetch::archetype_fetch, and
Fetch::table_fetch.