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| -rw-r--r-- | src/libcore/borrow.rs | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/libcore/borrow.rs b/src/libcore/borrow.rs index 06fda8d6092..0bfa3dac1b0 100644 --- a/src/libcore/borrow.rs +++ b/src/libcore/borrow.rs @@ -137,6 +137,18 @@ pub enum Cow<'a, T, Sized? B: 'a> where B: ToOwned<T> { Owned(T) } +impl<'a, T, Sized? B> Clone for Cow<'a, T, B> where B: ToOwned<T> { + fn clone(&self) -> Cow<'a, T, B> { + match *self { + Borrowed(b) => Borrowed(b), + Owned(ref o) => { + let b: &B = BorrowFrom::borrow_from(o); + Owned(b.to_owned()) + }, + } + } +} + impl<'a, T, Sized? B> Cow<'a, T, B> where B: ToOwned<T> { /// Acquire a mutable reference to the owned form of the data. /// |