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Rollup merge of #34305 - Aaronepower:master, r=alexcrichton

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Added Default trait for Cow.

Adds a default implementation for Cow. Which is the Owned's default.
This commit is contained in:
Jeffrey Seyfried 2016-06-29 00:39:49 +00:00
commit a77a179637
1 changed files with 11 additions and 0 deletions
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11
src/libcollections/borrow.rs
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@ -15,6 +15,7 @@
use core::clone::Clone;
use core::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
use core::convert::AsRef;
use core::default::Default;
use core::hash::{Hash, Hasher};
use core::marker::Sized;
use core::ops::Deref;
@ -248,6 +249,16 @@ impl<'a, B: ?Sized> fmt::Display for Cow<'a, B>
}
}
#[stable(feature = "default", since = "1.11.0")]
impl<'a, B: ?Sized> Default for Cow<'a, B>
where B: ToOwned,
<B as ToOwned>::Owned: Default
{
fn default() -> Cow<'a, B> {
Owned(<B as ToOwned>::Owned::default())
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<'a, B: ?Sized> Hash for Cow<'a, B> where B: Hash + ToOwned {
#[inline]