Struct HandlerList 

pub struct HandlerList<F: ?Sized> { /* private fields */ }

A list of event handlers that tolerates being modified while it is being invoked: invocation works on a snapshot, and the snapshot is only copied when the list actually changes.

Implementations

impl<F: ?Sized> HandlerList<F>

pub fn new() -> Self

pub fn with_shared_ids(ids: Rc<Cell<u64>>) -> Self

A list whose tokens come from ids, a counter shared with other lists: tokens across all of them increase in subscription order.

pub fn is_empty(&self) -> bool

pub fn len(&self) -> usize

pub fn add(&self, handler: Rc<F>) -> u64

Adds a handler and returns a token that removes it again.

pub fn remove(&self, token: u64) -> bool

Removes the handler registered under token.

pub fn snapshot(&self) -> Rc<Vec<(u64, Rc<F>)>>

Returns the current handlers; later modifications do not affect it.

Trait Implementations

impl<F: ?Sized> Default for HandlerList<F>

fn default() -> Self

Returns the “default value” for a type.