Module bevy_ecs::query

Structs

• Access
  Tracks read and write access to specific elements in a collection.
• Added
  A filter on a component that only retains results added after the system last ran.
• AnyOf
  The AnyOf query parameter fetches entities with any of the component types included in T.
• BatchingStrategy
  Dictates how a parallel query chunks up large tables/archetypes during iteration.
• ChangeTrackersDeprecated
  WorldQuery that tracks changes and additions for component T.
• Changed
  A filter on a component that only retains results added or mutably dereferenced after the system last ran.
• FilteredAccess
  An Access that has been filtered to include and exclude certain combinations of elements.
• FilteredAccessSet
  A collection of FilteredAccess instances.
• NopWorldQuery
  WorldQuery used to nullify queries by turning Query<Q> into Query<NopWorldQuery<Q>>
• Or
  A filter that tests if any of the given filters apply.
• QueryCombinationIter
  An iterator over K-sized combinations of query items without repetition.
• QueryIter
  An Iterator over query results of a Query.
• QueryManyIter
  An Iterator over the query items generated from an iterator of Entitys.
• QueryParIter
  A parallel iterator over query results of a Query.
• QueryState
  Provides scoped access to a World state according to a given WorldQuery and query filter.
• With
  Filter that selects entities with a component T.
• Without
  Filter that selects entities without a component T.

Enums

• QueryEntityError
  An error that occurs when retrieving a specific Entity’s query result.
• QuerySingleError
  An error that occurs when evaluating a QueryState as a single expected resulted via QueryState::single or QueryState::single_mut.

Traits

• ArchetypeFilter
  A marker trait to indicate that the filter works at an archetype level.
• ReadOnlyWorldQuery
  A world query that is read only.
• WorldQuery
  Types that can be fetched from a World using a Query.

Type Definitions

• QueryFetch
  The Fetch of a WorldQuery, which is used to store state for each archetype/table.
• QueryItem
  The item type returned when a WorldQuery is iterated over
• ROQueryFetch
  The read-only Fetch of a WorldQuery, which is used to store state for each archetype/table.
• ROQueryItem
  The read-only variant of the item type returned when a WorldQuery is iterated over immutably

Derive Macros

• WorldQuery
  Implement WorldQuery to use a struct as a parameter in a query