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// SPDX-License-Identifier: GPL-2.0
//! Kernel types.
use core::{cell::UnsafeCell, mem::MaybeUninit};
/// Stores an opaque value.
///
/// This is meant to be used with FFI objects that are never interpreted by Rust code.
#[repr(transparent)]
pub struct Opaque<T>(MaybeUninit<UnsafeCell<T>>);
impl<T> Opaque<T> {
/// Creates a new opaque value.
pub const fn new(value: T) -> Self {
Self(MaybeUninit::new(UnsafeCell::new(value)))
}
/// Creates an uninitialised value.
pub const fn uninit() -> Self {
Self(MaybeUninit::uninit())
}
/// Returns a raw pointer to the opaque data.
pub fn get(&self) -> *mut T {
UnsafeCell::raw_get(self.0.as_ptr())
}
}
/// A sum type that always holds either a value of type `L` or `R`.
pub enum Either<L, R> {
/// Constructs an instance of [`Either`] containing a value of type `L`.
Left(L),
/// Constructs an instance of [`Either`] containing a value of type `R`.
Right(R),
}
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