Struct specs::RunArg

pub struct RunArg { /* fields omitted */ }

System closure run-time argument.

Methods

impl RunArg

fn fetch<'a, U, F>(&'a self, f: F) -> U::Target where
    U: Gate,
    F: FnOnce(&'a World) -> U, 

Borrows the world, allowing the system to lock some components and get the entity iterator. Must be called only once.

fn fetch_new<'a, U, F>(
    &'a self,
    num_entities: usize,
    f: F
) -> (Vec<Entity>, U::Target) where
    U: Gate,
    F: FnOnce(&'a World) -> U, 

Borrows the world, allowing the system to lock some components and get the entity iterator. As an alternative to fetch(), it must be called only once. It allows creating a number of entities instantly, returned in a vector.

fn create_pure(&self) -> Entity

Creates a new entity dynamically.

fn delete(&self, entity: Entity)

Deletes an entity dynamically.