Struct PreparedQuery

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pub struct PreparedQuery<Q>where
    Q: Query,
{ /* private fields */ }

Expand description

A prepared query can be stored independently of the World to amortize query set-up costs.

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impl<Q> PreparedQuery<Q>
where Q: Query,

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pub fn new() -> PreparedQuery<Q>

Create a prepared query which is not yet attached to any world

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pub fn query<'q>(&'q mut self, world: &'q World) -> PreparedQueryBorrow<'q, Q>

Query world, using dynamic borrow checking

This will panic if it would violate an existing unique reference or construct an invalid unique reference.

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pub fn query_mut<'q>( &'q mut self, world: &'q mut World, ) -> PreparedQueryIter<'q, Q> ⓘ

Query a uniquely borrowed world

Avoids the cost of the dynamic borrow checking performed by query.

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pub fn view_mut<'q>(&'q mut self, world: &'q mut World) -> PreparedView<'q, Q>

Provide random access to query results for a uniquely borrow world

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impl<Q> Default for PreparedQuery<Q>
where Q: Query,

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fn default() -> PreparedQuery<Q>

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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impl<Q> Freeze for PreparedQuery<Q>

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impl<Q> RefUnwindSafe for PreparedQuery<Q>
where <<Q as Query>::Fetch as Fetch>::State: RefUnwindSafe, <Q as Query>::Fetch: RefUnwindSafe,

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impl<Q> Send for PreparedQuery<Q>
where <<Q as Query>::Fetch as Fetch>::State: Send, <Q as Query>::Fetch: Send,

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impl<Q> Sync for PreparedQuery<Q>
where <<Q as Query>::Fetch as Fetch>::State: Sync, <Q as Query>::Fetch: Sync,

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impl<Q> Unpin for PreparedQuery<Q>

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impl<Q> UnwindSafe for PreparedQuery<Q>
where <<Q as Query>::Fetch as Fetch>::State: UnwindSafe, <Q as Query>::Fetch: UnwindSafe,

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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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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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fn from(t: T) -> T

Returns the argument unchanged.

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impl<S> FromSample<S> for S

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fn from_sample_(s: S) -> S

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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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