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".

Implementors