Struct Mut 

pub struct Mut<'w, T> { /* private fields */ }

A smart pointer providing mutable access to a component that defers change-tick stamping to DerefMut. Holding a Mut<T> without writing through it leaves the component’s changed_tick untouched, so query_changed and incremental extraction see only entities that were actually mutated.

Interior mutability

Components that use interior mutability (AtomicUsize, Mutex<T>, etc.) can be mutated through Deref without triggering DerefMut. In that case, call set_changed() explicitly to stamp the change tick and ensure query_changed reports the modification.

Implementations

impl<T> Mut<'_, T>

pub fn set_changed(&mut self)

Manually stamp this component’s changed_tick at the current tick.

Use this when mutating through interior mutability (e.g., atomics) where DerefMut is not triggered. Has no effect if the component was already stamped by DerefMut in the same tick.

Trait Implementations

impl<T> Deref for Mut<'_, T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T> DerefMut for Mut<'_, T>

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

Mutably dereferences the value.