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use std::{
hash::Hash,
sync::{Arc, Weak, atomic::AtomicU32},
};
#[derive(Clone)]
pub struct WatchId {
id: u32,
count: Arc<()>,
}
#[derive(Clone)]
pub struct WeakWatchId {
id: u32,
count: Weak<()>,
}
impl PartialEq for WeakWatchId {
fn eq(&self, other: &Self) -> bool {
self.id == other.id
}
}
impl Eq for WeakWatchId {}
impl Hash for WeakWatchId {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
self.id.hash(state);
}
}
impl WatchId {
pub(super) fn new() -> Self {
static GEN: AtomicU32 = AtomicU32::new(0);
Self {
id: GEN.fetch_add(1, std::sync::atomic::Ordering::SeqCst),
count: Arc::new(()),
}
}
pub(super) fn weak(&self) -> WeakWatchId {
WeakWatchId {
id: self.id,
count: Arc::downgrade(&self.count),
}
}
}
impl WeakWatchId {
pub fn is_dead(&self) -> bool {
self.count.upgrade().is_none()
}
}
pub struct WatchState {
/// if set, essentially always dirty
pub special: bool,
/// has the set of watched variables changed?
pub dirty: bool,
}
|
