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

Unique mutable borrow of a Resource.

See the Resource documentation for usage.

If you need a shared borrow, use Res instead.

Panics

Panics when used as a SystemParam if the resource does not exist.

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

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impl<'w, T> ResMut<'w, T>
where T: Resource + ?Sized,

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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 ResMut <T>, but you need a Mut<T>.

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

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 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 ResMut<'w, T>
where T: Resource,

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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 ResMut<'w, T>
where T: Resource,

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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 ResMut<'w, T>
where T: Resource + Debug + ?Sized,

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

Formats the value using the given formatter. Read more
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impl<'w, T> Deref for ResMut<'w, T>
where T: Resource + ?Sized,

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type Target = T

The resulting type after dereferencing.
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fn deref(&self) -> &<ResMut<'w, T> as Deref>::Target

Dereferences the value.
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impl<'w, T> DerefMut for ResMut<'w, T>
where T: Resource + ?Sized,

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fn deref_mut(&mut self) -> &mut <ResMut<'w, T> as Deref>::Target

Mutably dereferences the value.
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impl<'w, T> DetectChanges for ResMut<'w, T>
where T: Resource + ?Sized,

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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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impl<'w, T> DetectChangesMut for ResMut<'w, T>
where T: Resource + ?Sized,

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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_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 bypass_change_detection( &mut self ) -> &mut <ResMut<'w, T> as DetectChangesMut>::Inner

Manually bypasses change detection, allowing you to mutate the underlying value without updating the change tick. Read more
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impl<'w, T> From<ResMut<'w, T>> for Mut<'w, T>
where T: Resource,

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

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

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impl<'w, T> From<ResMut<'w, T>> for Res<'w, T>
where T: Resource,

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fn from(res: ResMut<'w, T>) -> Res<'w, T>

Converts to this type from the input type.
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impl<'w, 'a, T> IntoIterator for &'a ResMut<'w, T>

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type Item = <&'a T as IntoIterator>::Item

The type of the elements being iterated over.
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type IntoIter = <&'a T as IntoIterator>::IntoIter

Which kind of iterator are we turning this into?
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fn into_iter(self) -> <&'a ResMut<'w, T> as IntoIterator>::IntoIter

Creates an iterator from a value. Read more
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impl<'w, 'a, T> IntoIterator for &'a mut ResMut<'w, T>

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type Item = <&'a mut T as IntoIterator>::Item

The type of the elements being iterated over.
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type IntoIter = <&'a mut T as IntoIterator>::IntoIter

Which kind of iterator are we turning this into?
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fn into_iter(self) -> <&'a mut ResMut<'w, T> as IntoIterator>::IntoIter

Creates an iterator from a value. Read more
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impl<'a, T> SystemParam for ResMut<'a, T>
where T: Resource,

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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> = ResMut<'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, system_meta: &mut SystemMeta ) -> <ResMut<'a, T> as SystemParam>::State

Registers any World access used by this SystemParam and creates a new instance of this param’s State.
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unsafe fn get_param<'w, 's>( _: &'s mut <ResMut<'a, T> as SystemParam>::State, system_meta: &SystemMeta, world: UnsafeWorldCell<'w>, change_tick: Tick ) -> <ResMut<'a, T> as SystemParam>::Item<'w, 's>

Creates a parameter to be passed into a SystemParamFunction. Read more
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fn new_archetype( _state: &mut Self::State, _archetype: &Archetype, _system_meta: &mut SystemMeta )

For the specified Archetype, registers the components accessed by this SystemParam (if applicable).
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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 apply_deferred.

Auto Trait Implementations§

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

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impl<'w, T: ?Sized> Send for ResMut<'w, T>

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impl<'w, T: ?Sized> Sync for ResMut<'w, T>

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

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impl<'w, T> !UnwindSafe for ResMut<'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, U> AsBindGroupShaderType<U> for T
where U: ShaderType, &'a T: for<'a> Into<U>,

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fn as_bind_group_shader_type(&self, _images: &RenderAssets<Image>) -> U

Return the T ShaderType for self. When used in AsBindGroup derives, it is safe to assume that all images in self exist.
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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> Downcast for T
where T: Any,

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

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

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

Convert &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)

Convert &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> DowncastSync for T
where T: Any + Send + Sync,

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fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Send + Sync>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<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<S> FromSample<S> for S

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fn from_sample_(s: S) -> S

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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, U> ToSample<U> for T
where U: FromSample<T>,

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fn to_sample_(self) -> U

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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> Upcast<T> for T

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fn upcast(&self) -> Option<&T>

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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<S, T> Duplex<S> for T
where T: FromSample<S> + ToSample<S>,

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impl<T> Settings for T
where T: 'static + Send + Sync,

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impl<T> WasmNotSend for T
where T: Send,

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impl<T> WasmNotSendSync for T

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impl<T> WasmNotSync for T
where T: Sync,