Struct OpaqueHandler 

pub struct OpaqueHandler<F> { /* private fields */ }

Wrapper for closures that receive &mut World directly as a Handler.

Created by IntoHandler::into_handler when the function signature is FnMut(&mut World, E). The closure handles its own resource access — no Param resolution occurs.

Prefer named functions with Param resolution for hot-path handlers. OpaqueHandler is an escape hatch for cases where dynamic or conditional resource access is needed.

Trait Implementations

impl<E, F: FnMut(&mut World, E) + Send + 'static> Handler<E> for OpaqueHandler<F>

fn run(&mut self, world: &mut World, event: E)

Run this handler with the given event.

fn name(&self) -> &'static str

Returns the handler’s name.