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Implement BorrowFrom<&'a T> for T (with mutable variants)

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Jonathan S 2014-11-20 10:34:54 -06:00
parent 394269d16e
commit 07af6f0f43
1 changed files with 10 additions and 2 deletions
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12
src/libcore/borrow.rs
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@ -69,8 +69,16 @@ impl<Sized? T> BorrowFromMut<T> for T {
fn borrow_from_mut(owned: &mut T) -> &mut T { owned }
}
impl BorrowFrom<&'static str> for str {
fn borrow_from<'a>(owned: &'a &'static str) -> &'a str { &**owned }
impl<'a, Sized? T> BorrowFrom<&'a T> for T {
fn borrow_from<'b>(owned: &'b &'a T) -> &'b T { &**owned }
}
impl<'a, Sized? T> BorrowFrom<&'a mut T> for T {
fn borrow_from<'b>(owned: &'b &'a mut T) -> &'b T { &**owned }
}
impl<'a, Sized? T> BorrowFromMut<&'a mut T> for T {
fn borrow_from_mut<'b>(owned: &'b mut &'a mut T) -> &'b mut T { &mut **owned }
}
/// A generalization of Clone to borrowed data.