Struct QueryOne

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

Expand description

A borrow of a World sufficient to execute the query Q on a single entity

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impl<'a, Q> QueryOne<'a, Q>
where Q: Query,

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pub fn get(&mut self) -> Option<<Q as Query>::Item<'_>>

Get the query result, or None if the entity does not satisfy the query

Must be called at most once.

Panics if called more than once or if it would construct a borrow that clashes with another pre-existing borrow.

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pub fn with<R>(self) -> QueryOne<'a, With<Q, R>>
where R: Query,

Transform the query into one that requires another query be satisfied

See QueryBorrow::with

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pub fn without<R>(self) -> QueryOne<'a, Without<Q, R>>
where R: Query,

Transform the query into one that skips entities satisfying another

See QueryBorrow::without for details.

Trait Implementations§

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impl<Q> Drop for QueryOne<'_, Q>
where Q: Query,

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fn drop(&mut self)

Executes the destructor for this type. Read more

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impl<Q> Send for QueryOne<'_, Q>
where Q: Query,

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impl<Q> Sync for QueryOne<'_, Q>
where Q: Query,

Auto Trait Implementations§

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impl<'a, Q> UnwindSafe for QueryOne<'a, Q>
where Q: UnwindSafe,

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> Downcast<T> for T

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fn downcast(&self) -> &T

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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<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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