Struct ResMut 

pub struct ResMut<'a, T: Component> { /* private fields */ }

Mutable borrow of a singleton resource T.

Obtained as a system parameter; derefs to T.

Trait Implementations

impl<'a, T: Component> Deref for ResMut<'a, T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<'a, T: Component> DerefMut for ResMut<'a, T>

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

Mutably dereferences the value.

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

where T: 'static + Sync + Send,

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

type State = ()

fn fetch<'a>( _state: &'a mut Self::State, world: &'a World, resource: &'a Resources, ) -> Self::Item<'a>

fn requires() -> Vec<RequiredResource>

Resource types this parameter unconditionally needs present to avoid panicking. Used by App to validate — before running a non-convergent stage’s systems — that every hard requirement is already satisfied, failing fast with a clear message instead of panicking deep inside whichever system happens to run first.