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libcore: Implement cloned() for Option<&mut T> #43705

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Merged
merged 3 commits into from
Aug 30, 2017
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libcore: Implement cloned() for Option<&mut T> #43705

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51b29d6
libcore: Implement cloned() for Option<&mut T>
panicbit Aug 6, 2017
5383205
Fix Option<&mut T>::cloned doc test
panicbit Aug 7, 2017
9618299
Assign tracking issue to option_ref_mut_cloned
panicbit Aug 8, 2017
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20 changes: 20 additions & 0 deletions src/libcore/option.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -774,6 +774,26 @@ impl<'a, T: Clone> Option<&'a T> {
}
}

impl<'a, T: Clone> Option<&'a mut T> {
/// Maps an `Option<&mut T>` to an `Option<T>` by cloning the contents of the
/// option.
///
/// # Examples
///
/// ```
/// #![feature(option_ref_mut_cloned)]
/// let mut x = 12;
/// let opt_x = Some(&mut x);
/// assert_eq!(opt_x, Some(&mut 12));
/// let cloned = opt_x.cloned();
/// assert_eq!(cloned, Some(12));
/// ```
#[unstable(feature = "option_ref_mut_cloned", issue = "43738")]
pub fn cloned(self) -> Option<T> {
self.map(|t| t.clone())
}
}

impl<T: Default> Option<T> {
/// Returns the contained value or a default
///
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