NonSendMut

Struct NonSendMut 

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pub struct NonSendMut<'w, T: ?Sized + 'static> { /* private fields */ }
Expand description

Unique borrow of a non-Send resource.

Only Send resources may be accessed with the ResMut SystemParam. In case that the resource does not implement Send, this SystemParam wrapper can be used. This will instruct the scheduler to instead run the system on the main thread so that it doesn’t send the resource over to another thread.

This SystemParam fails validation if non-send resource doesn’t exist. This will cause a panic, but can be configured to do nothing or warn once.

Use Option<NonSendMut<T>> instead if the resource might not always exist.

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impl<'w, T: ?Sized> NonSendMut<'w, T>

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pub fn into_inner(self) -> &'w mut T

Consume self and return a mutable reference to the contained value while marking self as “changed”.

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pub fn reborrow(&mut self) -> Mut<'_, T>

Returns a Mut<> with a smaller lifetime. This is useful if you have &mut NonSendMut <T>, but you need a Mut<T>.

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pub fn map_unchanged<U: ?Sized>( self, f: impl FnOnce(&mut T) -> &mut U, ) -> Mut<'w, U>

Maps to an inner value by applying a function to the contained reference, without flagging a change.

You should never modify the argument passed to the closure – if you want to modify the data without flagging a change, consider using DetectChangesMut::bypass_change_detection to make your intent explicit.

// When run, zeroes the translation of every entity.
fn reset_positions(mut transforms: Query<&mut Transform>) {
    for transform in &mut transforms {
        // We pinky promise not to modify `t` within the closure.
        // Breaking this promise will result in logic errors, but will never cause undefined behavior.
        let mut translation = transform.map_unchanged(|t| &mut t.translation);
        // Only reset the translation if it isn't already zero;
        translation.set_if_neq(Vec2::ZERO);
    }
}
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pub fn filter_map_unchanged<U: ?Sized>( self, f: impl FnOnce(&mut T) -> Option<&mut U>, ) -> Option<Mut<'w, U>>

Optionally maps to an inner value by applying a function to the contained reference. This is useful in a situation where you need to convert a Mut<T> to a Mut<U>, but only if T contains U.

As with map_unchanged, you should never modify the argument passed to the closure.

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pub fn try_map_unchanged<U: ?Sized, E>( self, f: impl FnOnce(&mut T) -> Result<&mut U, E>, ) -> Result<Mut<'w, U>, E>

Optionally maps to an inner value by applying a function to the contained reference, returns an error on failure. This is useful in a situation where you need to convert a Mut<T> to a Mut<U>, but only if T contains U.

As with map_unchanged, you should never modify the argument passed to the closure.

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pub fn as_deref_mut(&mut self) -> Mut<'_, <T as Deref>::Target>
where T: DerefMut,

Allows you access to the dereferenced value of this pointer without immediately triggering change detection.

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impl<'w, T> AsMut<T> for NonSendMut<'w, T>

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

Converts this type into a mutable reference of the (usually inferred) input type.
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impl<'w, T> AsRef<T> for NonSendMut<'w, T>

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fn as_ref(&self) -> &T

Converts this type into a shared reference of the (usually inferred) input type.
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impl<'w, T> Debug for NonSendMut<'w, T>
where T: Debug + ?Sized,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<'w, T: ?Sized> Deref for NonSendMut<'w, 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<'w, T: ?Sized> DerefMut for NonSendMut<'w, T>

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

Mutably dereferences the value.
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impl<'w, T: ?Sized> DetectChanges for NonSendMut<'w, T>

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fn is_added(&self) -> bool

Returns true if this value was added after the system last ran.
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fn is_changed(&self) -> bool

Returns true if this value was added or mutably dereferenced either since the last time the system ran or, if the system never ran, since the beginning of the program. Read more
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fn last_changed(&self) -> Tick

Returns the change tick recording the time this data was most recently changed. Read more
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fn added(&self) -> Tick

Returns the change tick recording the time this data was added.
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fn changed_by(&self) -> MaybeLocation

The location that last caused this to change.
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impl<'w, T: ?Sized> DetectChangesMut for NonSendMut<'w, T>

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type Inner = T

The type contained within this smart pointer Read more
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fn set_changed(&mut self)

Flags this value as having been changed. Read more
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fn set_added(&mut self)

Flags this value as having been added. Read more
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fn set_last_changed(&mut self, last_changed: Tick)

Manually sets the change tick recording the time when this data was last mutated. Read more
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fn set_last_added(&mut self, last_added: Tick)

Manually sets the added tick recording the time when this data was last added. Read more
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fn bypass_change_detection(&mut self) -> &mut Self::Inner

Manually bypasses change detection, allowing you to mutate the underlying value without updating the change tick. Read more
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fn set_if_neq(&mut self, value: Self::Inner) -> bool
where Self::Inner: Sized + PartialEq,

Overwrites this smart pointer with the given value, if and only if *self != value. Returns true if the value was overwritten, and returns false if it was not. Read more
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fn replace_if_neq(&mut self, value: Self::Inner) -> Option<Self::Inner>
where Self::Inner: Sized + PartialEq,

Overwrites this smart pointer with the given value, if and only if *self != value, returning the previous value if this occurs. Read more
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fn clone_from_if_neq<T>(&mut self, value: &T) -> bool
where T: ToOwned<Owned = Self::Inner> + ?Sized, Self::Inner: PartialEq<T>,

Overwrites this smart pointer with a clone of the given value, if and only if *self != value. Returns true if the value was overwritten, and returns false if it was not. Read more
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impl<'a, T> From<NonSendMut<'a, T>> for NonSend<'a, T>

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fn from(nsm: NonSendMut<'a, T>) -> Self

Converts to this type from the input type.
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impl<'w, T: 'static> From<NonSendMut<'w, T>> for Mut<'w, T>

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fn from(other: NonSendMut<'w, T>) -> Mut<'w, T>

Convert this NonSendMut into a Mut. This allows keeping the change-detection feature of Mut while losing the specificity of NonSendMut.

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impl<'a, T: 'static> SystemParam for NonSendMut<'a, T>

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type State = ComponentId

Used to store data which persists across invocations of a system.
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type Item<'w, 's> = NonSendMut<'w, T>

The item type returned when constructing this system param. The value of this associated type should be Self, instantiated with new lifetimes. Read more
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fn init_state(world: &mut World) -> Self::State

Creates a new instance of this param’s State.
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fn init_access( component_id: &Self::State, system_meta: &mut SystemMeta, component_access_set: &mut FilteredAccessSet, _world: &mut World, )

Registers any World access used by this SystemParam
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unsafe fn validate_param( component_id: &mut Self::State, _system_meta: &SystemMeta, world: UnsafeWorldCell<'_>, ) -> Result<(), SystemParamValidationError>

Validates that the param can be acquired by the get_param. Read more
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unsafe fn get_param<'w, 's>( component_id: &'s mut Self::State, system_meta: &SystemMeta, world: UnsafeWorldCell<'w>, change_tick: Tick, ) -> Self::Item<'w, 's>

Creates a parameter to be passed into a SystemParamFunction. Read more
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fn apply(state: &mut Self::State, system_meta: &SystemMeta, world: &mut World)

Applies any deferred mutations stored in this SystemParam’s state. This is used to apply Commands during ApplyDeferred.
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fn queue( state: &mut Self::State, system_meta: &SystemMeta, world: DeferredWorld<'_>, )

Queues any deferred mutations to be applied at the next ApplyDeferred.

Auto Trait Implementations§

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impl<'w, T> Freeze for NonSendMut<'w, T>
where T: ?Sized,

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impl<'w, T> RefUnwindSafe for NonSendMut<'w, T>
where T: RefUnwindSafe + ?Sized,

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impl<'w, T> Send for NonSendMut<'w, T>
where T: Send + ?Sized,

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impl<'w, T> Sync for NonSendMut<'w, T>
where T: Sync + ?Sized,

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impl<'w, T> Unpin for NonSendMut<'w, T>
where T: ?Sized,

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impl<'w, T> !UnwindSafe for NonSendMut<'w, T>

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 for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Converts Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>, which can then be downcast into Box<dyn ConcreteType> where ConcreteType implements Trait.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Converts Rc<Trait> (where Trait: Downcast) to Rc<Any>, which can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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fn as_any(&self) -> &(dyn Any + 'static)

Converts &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Converts &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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impl<T> DowncastSend for T
where T: Any + Send,

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fn into_any_send(self: Box<T>) -> Box<dyn Any + Send>

Converts Box<Trait> (where Trait: DowncastSend) to Box<dyn Any + Send>, which can then be downcast into Box<ConcreteType> where ConcreteType implements Trait.
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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<T> IntoResult<T> for T

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fn into_result(self) -> Result<T, RunSystemError>

Converts this type into the system output type.
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impl<A> Is for A
where A: Any,

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fn is<T>() -> bool
where T: Any,

Checks if the current type “is” another type, using a TypeId equality comparison. This is most useful in the context of generic logic. Read more
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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<R> Rng for R
where R: RngCore + ?Sized,

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fn random<T>(&mut self) -> T

Return a random value via the StandardUniform distribution. Read more
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fn random_iter<T>(self) -> Iter<StandardUniform, Self, T>

Return an iterator over random variates Read more
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fn random_range<T, R>(&mut self, range: R) -> T
where T: SampleUniform, R: SampleRange<T>,

Generate a random value in the given range. Read more
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fn random_bool(&mut self, p: f64) -> bool

Return a bool with a probability p of being true. Read more
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fn random_ratio(&mut self, numerator: u32, denominator: u32) -> bool

Return a bool with a probability of numerator/denominator of being true. Read more
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fn sample<T, D>(&mut self, distr: D) -> T
where D: Distribution<T>,

Sample a new value, using the given distribution. Read more
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fn sample_iter<T, D>(self, distr: D) -> Iter<D, Self, T>
where D: Distribution<T>, Self: Sized,

Create an iterator that generates values using the given distribution. Read more
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fn fill<T>(&mut self, dest: &mut T)
where T: Fill + ?Sized,

Fill any type implementing Fill with random data Read more
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fn gen<T>(&mut self) -> T

👎Deprecated since 0.9.0: Renamed to random to avoid conflict with the new gen keyword in Rust 2024.
Alias for Rng::random.
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fn gen_range<T, R>(&mut self, range: R) -> T
where T: SampleUniform, R: SampleRange<T>,

👎Deprecated since 0.9.0: Renamed to random_range
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fn gen_bool(&mut self, p: f64) -> bool

👎Deprecated since 0.9.0: Renamed to random_bool
Alias for Rng::random_bool.
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fn gen_ratio(&mut self, numerator: u32, denominator: u32) -> bool

👎Deprecated since 0.9.0: Renamed to random_ratio
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impl<T> RngCore for T
where T: DerefMut, <T as Deref>::Target: RngCore,

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fn next_u32(&mut self) -> u32

Return the next random u32. Read more
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fn next_u64(&mut self) -> u64

Return the next random u64. Read more
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fn fill_bytes(&mut self, dst: &mut [u8])

Fill dest with random data. Read more
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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<R> TryRngCore for R
where R: RngCore + ?Sized,

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type Error = Infallible

The type returned in the event of a RNG error.
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fn try_next_u32(&mut self) -> Result<u32, <R as TryRngCore>::Error>

Return the next random u32.
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fn try_next_u64(&mut self) -> Result<u64, <R as TryRngCore>::Error>

Return the next random u64.
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fn try_fill_bytes( &mut self, dst: &mut [u8], ) -> Result<(), <R as TryRngCore>::Error>

Fill dest entirely with random data.
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fn unwrap_err(self) -> UnwrapErr<Self>
where Self: Sized,

Wrap RNG with the UnwrapErr wrapper.
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fn unwrap_mut(&mut self) -> UnwrapMut<'_, Self>

Wrap RNG with the UnwrapMut wrapper.
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fn read_adapter(&mut self) -> RngReadAdapter<'_, Self>
where Self: Sized,

Convert an RngCore to a RngReadAdapter.
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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,

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impl<T> CryptoRng for T
where T: DerefMut, <T as Deref>::Target: CryptoRng,

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impl<R> TryCryptoRng for R
where R: CryptoRng + ?Sized,