Function with_stepped_world 

pub fn with_stepped_world<R>(
    host: &World,
    entity: Entity,
    f: impl FnOnce(&World) -> R,
) -> Result<R, StepError>

Run f against a stepped world’s world.

A host that supplies its own buffers - an offline run filling an audio buffer frame by frame, say - reads the world through this instead of through the world’s jobs.

Errors

Returns StepError::NoWorld when entity names no reachable world proxy, and StepError::NotStepped when it names a threaded world.