Struct ResMut 

pub struct ResMut<'w, T: 'static> { /* private fields */ }

Mutable reference to a resource in World.

Appears in system function signatures to declare a write dependency. Derefs to the inner value transparently. Stamps the resource’s changed_at sequence on DerefMut — the act of writing is the change signal.

Construction is pub(crate) — only the dispatch layer creates these.

Implementations

impl<'w, T: 'static> ResMut<'w, T>

pub fn is_changed(&self) -> bool

Returns true if the resource was modified during the current sequence.

Trait Implementations

impl<T: 'static> Deref for ResMut<'_, T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T: 'static> DerefMut for ResMut<'_, T>

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

Mutably dereferences the value.

impl<T: 'static> SystemParam for ResMut<'_, T>

type State = ResourceId

Opaque state cached at build time (e.g. ResourceId).

type Item<'w> = ResMut<'w, T>

The item produced at dispatch time.

fn init(registry: &Registry) -> ResourceId

Resolve state from the registry. Called once at build time.

unsafe fn fetch<'w>( world: &'w World, state: &'w mut ResourceId, ) -> ResMut<'w, T>

Fetch the item using cached state.

fn any_changed(state: &ResourceId, world: &World) -> bool

Returns true if any resource this param depends on was modified during the current sequence.

fn resource_id(state: &ResourceId) -> Option<ResourceId>

The ResourceId this param accesses, if any.