Struct PreparedView

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pub struct PreparedView<'q, Q>where
    Q: Query,
{ /* private fields */ }

Expand description

Provides random access to the results of a prepared query

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impl<'q, Q> PreparedView<'q, Q>
where Q: Query,

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pub fn get(&self, entity: Entity) -> Option<<Q as Query>::Item<'_>>
where Q: QueryShared,

Retrieve the query results corresponding to entity

Will yield None if the entity does not exist or does not match the query.

Does not require exclusive access to the map, but is defined only for queries yielding only shared references.

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pub fn get_mut(&mut self, entity: Entity) -> Option<<Q as Query>::Item<'_>>

Retrieve the query results corresponding to entity

Will yield None if the entity does not exist or does not match the query.

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pub unsafe fn get_unchecked( &self, entity: Entity, ) -> Option<<Q as Query>::Item<'_>>

Like get_mut, but allows simultaneous access to multiple entities

§Safety

Must not be invoked while any unique borrow of the fetched components of entity is live.

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pub fn get_mut_n<const N: usize>( &mut self, entities: [Entity; N], ) -> [Option<<Q as Query>::Item<'_>>; N]

Like get_mut, but allows checked simultaneous access to multiple entities

See View::get_mut_n for details.

Trait Implementations§

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impl<'q, Q> Send for PreparedView<'q, Q>
where Q: Query, <Q as Query>::Item<'a>: for<'a> Send,

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impl<'q, Q> Sync for PreparedView<'q, Q>
where Q: Query, <Q as Query>::Item<'a>: for<'a> Send,

Auto Trait Implementations§

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impl<'q, Q> Freeze for PreparedView<'q, Q>

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impl<'q, Q> RefUnwindSafe for PreparedView<'q, Q>
where <Q as Query>::Fetch: RefUnwindSafe,

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impl<'q, Q> Unpin for PreparedView<'q, Q>

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impl<'q, Q> !UnwindSafe for PreparedView<'q, Q>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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fn type_name(&self) -> &'static str

Gets the type name of self

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> Downcast for T
where T: AsAny + ?Sized,

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fn is<T>(&self) -> bool
where T: AsAny,

Returns true if the boxed type is the same as T. Read more

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fn downcast_ref<T>(&self) -> Option<&T>
where T: AsAny,

Forward to the method defined on the type Any.

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fn downcast_mut<T>(&mut self) -> Option<&mut T>
where T: AsAny,

Forward to the method defined on the type Any.

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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