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Add as_mut methods to the std::cell structs #32565

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Merged
merged 1 commit into from
May 6, 2016
Merged

Add as_mut methods to the std::cell structs #32565

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24 changes: 24 additions & 0 deletions src/libcore/cell.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -232,6 +232,18 @@ impl<T:Copy> Cell<T> {
pub fn as_unsafe_cell(&self) -> &UnsafeCell<T> {
&self.value
}

/// Returns a mutable reference to the underlying data.
///
/// This call borrows `Cell` mutably (at compile-time) which guarantees
/// that we possess the only reference.
#[inline]
#[unstable(feature = "cell_get_mut", issue = "33444")]
pub fn get_mut(&mut self) -> &mut T {
unsafe {
&mut *self.value.get()
}
}
}

#[stable(feature = "rust1", since = "1.0.0")]
Expand Down Expand Up @@ -455,6 +467,18 @@ impl<T: ?Sized> RefCell<T> {
pub unsafe fn as_unsafe_cell(&self) -> &UnsafeCell<T> {
&self.value
}

/// Returns a mutable reference to the underlying data.
///
/// This call borrows `RefCell` mutably (at compile-time) so there is no
/// need for dynamic checks.
#[inline]
#[unstable(feature = "cell_get_mut", issue="33444")]
pub fn get_mut(&mut self) -> &mut T {
unsafe {
&mut *self.value.get()
}
}
}

#[stable(feature = "rust1", since = "1.0.0")]
Expand Down