Struct ShutdownObserver 

pub struct ShutdownObserver { /* private fields */ }

A shutdown observer for fdf_dispatcher_create that can call any kind of callback instead of just a C-compatible function when a dispatcher is shutdown.

Safety

This object relies on a specific layout to allow it to be cast between a *mut fdf_dispatcher_shutdown_observer and a *mut ShutdownObserver. To that end, it is important that this struct stay both #[repr(C)] and that observer be its first member.

Implementations

impl ShutdownObserver

pub fn new<F: ShutdownObserverFn>(f: F) -> Self

Creates a new ShutdownObserver with f as the callback to run when a dispatcher finishes shutting down.

pub fn into_ptr(self) -> *mut fdf_dispatcher_shutdown_observer

Turns this object into a stable pointer suitable for passing to fdf_dispatcher_create by wrapping it in a Box and leaking it to be reconstituded by Self::handler when the dispatcher is shut down.