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Add TakeCell::get_mut function #2077

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Sep 9, 2020
Merged

Add TakeCell::get_mut function #2077

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4eb3414
Add TakeCell::get_mut function
Aug 15, 2020
162efed
Apply suggested documentation change
Aug 17, 2020
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9 changes: 9 additions & 0 deletions libraries/tock-cells/src/take_cell.rs
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Expand Up @@ -73,6 +73,15 @@ impl<'a, T: ?Sized> TakeCell<'a, T> {
self.val.replace(Some(val))
}

/// Retrieves a mutable reference to the inner value that only lives as long
/// as the reference to this does.
///
/// This escapes the "take" aspect of TakeCell in a way which is guaranteed
/// safe due to the returned reference sharing the lifetime of `&mut self`.
pub fn get_mut(&mut self) -> Option<&mut T> {
self.val.get_mut().as_mut().map(|v| &mut **v)
}

/// Allows `closure` to borrow the contents of the `TakeCell` if-and-only-if
/// it is not `take`n already. The state of the `TakeCell` is unchanged
/// after the closure completes.
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