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//! Compat layer for [`core::cell::UnsafeCell`] and `loom::cell::UnsafeCell`.
#[cfg(loom)]
pub use loom::cell::UnsafeCell;
#[cfg(not(loom))]
pub use core::UnsafeCell;
#[cfg(not(loom))]
mod core {
/// An [`core::cell::UnsafeCell`] wrapper that provides compatibility with
/// loom's UnsafeCell.
#[derive(Debug)]
pub struct UnsafeCell<T>(core::cell::UnsafeCell<T>);
impl<T> UnsafeCell<T> {
/// Create a new `UnsafeCell`.
pub const fn new(data: T) -> UnsafeCell<T> {
UnsafeCell(core::cell::UnsafeCell::new(data))
}
/// Access the contents of the `UnsafeCell` through a mut pointer.
pub fn get_mut(&self) -> MutPtr<T> {
MutPtr(self.0.get())
}
pub unsafe fn with_mut<F, R>(&self, f: F) -> R
where
F: FnOnce(*mut T) -> R,
{
f(self.0.get())
}
}
pub struct MutPtr<T>(*mut T);
impl<T> MutPtr<T> {
#[allow(clippy::mut_from_ref)]
pub unsafe fn deref(&self) -> &mut T {
&mut *self.0
}
}
}
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