bevy_ecs::system

Struct In

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pub struct In<In>(pub In);
Expand description

Wrapper type to mark a SystemParam as an input.

Systems may take an optional input which they require to be passed to them when they are being run. For FunctionSystems the input may be marked with this In type, but only the first param of a function may be tagged as an input. This also means a system can only have one or zero input parameters.

§Examples

Here is a simple example of a system that takes a usize returning the square of it.

use bevy_ecs::prelude::*;

fn main() {
    let mut square_system = IntoSystem::into_system(square);

    let mut world = World::default();
    square_system.initialize(&mut world);
    assert_eq!(square_system.run(12, &mut world), 144);
}

fn square(In(input): In<usize>) -> usize {
    input * input
}

Tuple Fields§

§0: In

Trait Implementations§

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impl<T> Deref for In<T>

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type Target = T

The resulting type after dereferencing.
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fn deref(&self) -> &Self::Target

Dereferences the value.
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impl<T> DerefMut for In<T>

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fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

Auto Trait Implementations§

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impl<In> Freeze for In<In>
where In: Freeze,

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impl<In> RefUnwindSafe for In<In>
where In: RefUnwindSafe,

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impl<In> Send for In<In>
where In: Send,

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impl<In> Sync for In<In>
where In: Sync,

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impl<In> Unpin for In<In>
where In: Unpin,

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impl<In> UnwindSafe for In<In>
where In: 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> 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<U> 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<P, T> Receiver for P
where P: Deref<Target = T> + ?Sized, T: ?Sized,

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type Target = T

🔬This is a nightly-only experimental API. (arbitrary_self_types)
The target type on which the method may be called.
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> ConditionalSend for T
where T: Send,