pub type BoxedDispatchFn = fn(Arc<ServiceProvider>, Arc<HandlerCache>, Box<dyn Any + Send>) -> Pin<Box<dyn Future<Output = Result<Box<dyn Any + Send>, Error>> + Send>>;Expand description
Type-erased dispatch function for one request type.
#[handler] generates one per impl IRequestHandler<T, R>: it downcasts the
boxed request to T, runs the typed dispatch (pipeline + handler) and boxes
the R response. This is what lets IMediator::send_boxed work through
Arc<dyn IMediator> without knowing T/R at the call site.