66 lines
1.4 KiB
Rust
66 lines
1.4 KiB
Rust
use std::{
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any::Any,
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cell::{Cell, UnsafeCell},
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};
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pub struct HookList {
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vals: appendlist::AppendList<InnerHook<Box<dyn Any>>>,
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idx: Cell<usize>,
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}
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impl Default for HookList {
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fn default() -> Self {
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Self {
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vals: Default::default(),
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idx: Cell::new(0),
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}
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}
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}
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struct InnerHook<T> {
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cell: UnsafeCell<T>,
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}
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impl<T> InnerHook<T> {
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fn new(new: T) -> Self {
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Self {
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cell: UnsafeCell::new(new),
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}
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}
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}
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impl HookList {
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pub(crate) fn push<T: 'static>(&self, new: T) {
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self.vals.push(InnerHook::new(Box::new(new)))
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}
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pub(crate) fn next<T: 'static>(&self) -> Option<&mut T> {
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self.vals.get(self.idx.get()).and_then(|inn| {
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self.idx.set(self.idx.get() + 1);
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let raw_box = unsafe { &mut *inn.cell.get() };
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raw_box.downcast_mut::<T>()
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})
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}
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/// This resets the internal iterator count
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/// It's okay that we've given out each hook, but now we have the opportunity to give it out again
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/// Therefore, resetting is cosudered unsafe
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pub(crate) unsafe fn reset(&mut self) {
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self.idx.set(0);
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}
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#[inline]
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pub(crate) fn len(&self) -> usize {
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self.vals.len()
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}
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#[inline]
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pub(crate) fn cur_idx(&self) -> usize {
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self.idx.get()
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}
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#[inline]
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pub(crate) fn at_end(&self) -> bool {
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self.cur_idx() >= self.len()
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}
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}
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