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Implement cursors for BTreeMap #105641

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Feb 8, 2023
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Implement cursors for BTreeMap #105641

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eb70c82
BTreeMap: Change internal insert function to return a handle
Amanieu Dec 8, 2022
36831b3
BTreeMap: Add Cursor and CursorMut
Amanieu Dec 8, 2022
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22 changes: 22 additions & 0 deletions library/alloc/src/collections/btree/borrow.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,28 @@ impl<'a, T> DormantMutRef<'a, T> {
// SAFETY: our own safety conditions imply this reference is again unique.
unsafe { &mut *self.ptr.as_ptr() }
}

/// Borrows a new mutable reference from the unique borrow initially captured.
///
/// # Safety
///
/// The reborrow must have ended, i.e., the reference returned by `new` and
/// all pointers and references derived from it, must not be used anymore.
pub unsafe fn reborrow(&mut self) -> &'a mut T {
// SAFETY: our own safety conditions imply this reference is again unique.
unsafe { &mut *self.ptr.as_ptr() }
}

/// Borrows a new shared reference from the unique borrow initially captured.
///
/// # Safety
///
/// The reborrow must have ended, i.e., the reference returned by `new` and
/// all pointers and references derived from it, must not be used anymore.
pub unsafe fn reborrow_shared(&self) -> &'a T {
// SAFETY: our own safety conditions imply this reference is again unique.
unsafe { &*self.ptr.as_ptr() }
}
}

#[cfg(test)]
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