Trait SystemParam 

pub trait SystemParam: Sized {
    type State: Default + Send + Sync + 'static;

    // Required method
    fn init_state(world: &mut World) -> Self::State;
}

Types extractable from a World as system parameters.

Required Associated Types

type State: Default + Send + Sync + 'static

Per-system persistent state.

Required Methods

fn init_state(world: &mut World) -> Self::State

Initialises state from the world.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors