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use std::cell::UnsafeCell;
#[derive(Debug)]
pub(crate) struct CausalCell<T>(UnsafeCell<T>);
#[derive(Default)]
pub(crate) struct CausalCheck(());
impl<T> CausalCell<T> {
pub(crate) fn new(data: T) -> CausalCell<T> {
CausalCell(UnsafeCell::new(data))
}
pub(crate) fn with<F, R>(&self, f: F) -> R
where
F: FnOnce(*const T) -> R,
{
f(self.0.get())
}
pub(crate) fn with_unchecked<F, R>(&self, f: F) -> R
where
F: FnOnce(*const T) -> R,
{
f(self.0.get())
}
pub(crate) fn check(&self) {}
pub(crate) fn with_deferred<F, R>(&self, f: F) -> (R, CausalCheck)
where
F: FnOnce(*const T) -> R,
{
(f(self.0.get()), CausalCheck::default())
}
pub(crate) fn with_mut<F, R>(&self, f: F) -> R
where
F: FnOnce(*mut T) -> R,
{
f(self.0.get())
}
}
impl CausalCheck {
pub(crate) fn check(self) {}
pub(crate) fn join(&mut self, _other: CausalCheck) {}
}
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