On Sat, Sep 20, 2025 at 04:29:52PM +0200, Paolo Bonzini wrote: > Date: Sat, 20 Sep 2025 16:29:52 +0200 > From: Paolo Bonzini <[email protected]> > Subject: [PATCH 1/7] rust: bql: add BqlRefCell::get_mut() > X-Mailer: git-send-email 2.51.0 > > This method is rarely useful in QEMU due to the pervasiveness of > shared references, but add it for when a &mut BqlRefCell<> is used. > > Signed-off-by: Paolo Bonzini <[email protected]> > --- > rust/bql/src/cell.rs | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/rust/bql/src/cell.rs b/rust/bql/src/cell.rs > index 24ab294b60d..8a0c8c14ad4 100644 > --- a/rust/bql/src/cell.rs > +++ b/rust/bql/src/cell.rs > @@ -580,6 +580,25 @@ pub fn borrow_mut(&self) -> BqlRefMut<'_, T> { > } > } > > + /// Returns a mutable reference to the underlying data in this cell, > + /// while the owner already has a mutable reference to the cell. > + /// > + /// # Examples > + /// > + /// ``` > + /// use bql::BqlRefCell; > + /// > + /// let mut c = BqlRefCell::new(5); > + /// > + /// *c.get_mut() = 10; > + /// ``` > + #[inline] > + pub const fn get_mut(&mut self) -> &mut T { > + // SAFETY: there cannot be any outstanding borrow, > + // since `self` is mutably owned. > + unsafe { &mut *self.as_ptr() }
Why not use UnsafeCell::get_mut? self.value.get_mut() Regards, Zhao
