Struct HashSubject 

pub struct HashSubject<O>
where
    O: HashSetObserver,
{ /* private fields */ }

Implements Subject backed by a HashSet<T>. T must implement PartialEq and Hash.

Examples

use roopes::prelude::*;
use std::{
    cell::RefCell,
    rc::Rc,
};
use enclose::enclose;

let mut hs = observer::HashSubject::default();

let has_run = Rc::new(RefCell::new(false));
let lc: ObservingCommand<_> = command::Hashable::new(
    command::Heap::from(enclose!((has_run) move || {
        (*has_run.borrow_mut()) = true;
    })),
    "Has Run").into();

hs.attach(lc);

assert!(!(*has_run.borrow()));
hs.notify();
assert!((*has_run.borrow()));

Implementations

impl<O> HashSubject<O>

where O: HashSetObserver,

pub fn new(listeners: HashSet<O>) -> HashSubject<O>

Creates a new HashSubject with an interior-mutable listener set. HashSubject::default is probably preferable in most situations.

Trait Implementations

impl<O> AttachableSubject<O> for HashSubject<O>

where O: HashSetObserver,

fn attach(&mut self, attach_observer: O)

Adds the Observer to the list of elements notified when the Subject is notified.

impl<O> Default for HashSubject<O>

where O: HashSetObserver,

fn default() -> HashSubject<O>

Returns the “default value” for a type.

impl<O> DetachableSubject<O, DetachError> for HashSubject<O>

where O: HashSetObserver,

fn detach(&mut self, detach_observer: &O) -> Result<(), DetachError>

Detaches the given Observer from the Subject so it would no longer receive notifications.

impl<O> Subject for HashSubject<O>

where O: HashSetObserver,

fn notify(&self)

Triggers the Observers corresponding notify implementations.