Struct SystemId

pub struct SystemId<I = (), O = ()> { /* private fields */ }

An identifier for a registered system.

These are opaque identifiers, keyed to a specific World, and are created via World::register_system.

Implementations

impl<I, O> SystemId<I, O>

pub fn entity(self) -> Entity

Transforms a SystemId into the Entity that holds the one-shot system’s state.

It’s trivial to convert SystemId into an Entity since a one-shot system is really an entity with associated handler function.

For example, this is useful if you want to assign a name label to a system.

pub fn from_entity(entity: Entity) -> Self

Create SystemId from an Entity. Useful when you only have entity handles to avoid adding extra components that have a SystemId everywhere. To run a system with this ID

• The entity must be a system
• The I + O types must be correct

Trait Implementations

impl<I, O> Clone for SystemId<I, O>

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<I, O> Debug for SystemId<I, O>

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

Formats the value using the given formatter.

impl<I, O> Hash for SystemId<I, O>

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<I, O> PartialEq for SystemId<I, O>

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<I, O> Copy for SystemId<I, O>

impl<I, O> Eq for SystemId<I, O>