teo_runtime/cell/
mod.rs

1use std::cell::UnsafeCell;
2
3pub struct SyncUnsafeCell<T> {
4    value: UnsafeCell<T>,
5}
6
7unsafe impl<T> Sync for SyncUnsafeCell<T> {}
8
9impl<T> SyncUnsafeCell<T> {
10    /// Constructs a new instance of `SyncUnsafeCell` which will wrap the specified value.
11    #[inline]
12    pub const fn new(value: T) -> Self {
13        Self { value: UnsafeCell::new(value) }
14    }
15}
16
17impl<T> SyncUnsafeCell<T> {
18    /// Gets a mutable pointer to the wrapped value.
19    ///
20    /// This can be cast to a pointer of any kind.
21    /// Ensure that the access is unique (no active references, mutable or not)
22    /// when casting to `&mut T`, and ensure that there are no mutations
23    /// or mutable aliases going on when casting to `&T`
24    #[inline]
25    pub const fn get(&self) -> *mut T {
26        self.value.get()
27    }
28
29    /// Gets a mutable pointer to the wrapped value.
30    ///
31    /// See [`UnsafeCell::get`] for details.
32    #[inline]
33    pub const fn raw_get(this: *const Self) -> *mut T {
34        // We can just cast the pointer from `SyncUnsafeCell<T>` to `T` because
35        // of #[repr(transparent)] on both SyncUnsafeCell and UnsafeCell.
36        // See UnsafeCell::raw_get.
37        this as *const T as *mut T
38    }
39}
40
41impl<T: Default> Default for SyncUnsafeCell<T> {
42    /// Creates an `SyncUnsafeCell`, with the `Default` value for T.
43    fn default() -> SyncUnsafeCell<T> {
44        SyncUnsafeCell::new(Default::default())
45    }
46}
47
48impl<T> From<T> for SyncUnsafeCell<T> {
49    /// Creates a new `SyncUnsafeCell<T>` containing the given value.
50    fn from(t: T) -> SyncUnsafeCell<T> {
51        SyncUnsafeCell::new(t)
52    }
53}
teo_runtime/cell/mod.rs

teo_runtime/cell/
mod.rs
