Struct QueryData

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pub struct QueryData<'a, Q, F = All, S = Planar>where
    Q: for<'x> Fetch<'x> + 'static,
    F: for<'x> Fetch<'x> + 'static,
{ /* private fields */ }

Expand description

Combined reference to a query and a world.

Allow for executing a query inside a system without violating access rules.

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impl<'a, Q, F, S> QueryData<'a, Q, F, S>
where Q: for<'x> Fetch<'x>, F: for<'x> Fetch<'x>, S: for<'x> QueryStrategy<'x, Q, F>,

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pub fn borrow(&mut self) -> <S as QueryStrategy<'_, Q, F>>::Borrow

Prepare the query.

This will borrow all required archetypes for the duration of the PreparedQuery.

The same query can be prepared multiple times, though not simultaneously.

Trait Implementations§

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impl<'a, 'w, Q, F, S> AsBorrowed<'a> for QueryData<'w, Q, F, S>
where Q: for<'x> Fetch<'x> + 'static, F: for<'x> Fetch<'x> + 'static, S: for<'x> QueryStrategy<'x, Q, F>, <S as QueryStrategy<'a, Q, F>>::Borrow: 'a,

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type Borrowed = <S as QueryStrategy<'a, Q, F>>::Borrow

The dereference target

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fn as_borrowed(&'a mut self) -> Self::Borrowed

Dereference a held borrow

Auto Trait Implementations§

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impl<'a, Q, F, S> Freeze for QueryData<'a, Q, F, S>

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impl<'a, Q, F = All, S = Planar> !RefUnwindSafe for QueryData<'a, Q, F, S>

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impl<'a, Q, F, S> Send for QueryData<'a, Q, F, S>
where S: Send, Q: Send, F: Send,

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impl<'a, Q, F, S> Sync for QueryData<'a, Q, F, S>
where S: Sync, Q: Sync, F: Sync,

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impl<'a, Q, F, S> Unpin for QueryData<'a, Q, F, S>

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impl<'a, Q, F = All, S = Planar> !UnwindSafe for QueryData<'a, Q, F, S>

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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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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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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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