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Jun 4, 2021
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Document From impls for cow.rs #85717

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18 changes: 18 additions & 0 deletions library/alloc/src/vec/cow.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,20 +5,38 @@ use super::Vec;

#[stable(feature = "cow_from_vec", since = "1.8.0")]
impl<'a, T: Clone> From<&'a [T]> for Cow<'a, [T]> {
/// Creates a [`Borrowed`] variant of [`Cow`]
/// from a slice.
///
/// This conversion does not allocate or clone the data.
///
/// [`Borrowed`]: crate::borrow::Cow::Borrowed
fn from(s: &'a [T]) -> Cow<'a, [T]> {
Cow::Borrowed(s)
}
}

#[stable(feature = "cow_from_vec", since = "1.8.0")]
impl<'a, T: Clone> From<Vec<T>> for Cow<'a, [T]> {
/// Creates an [`Owned`] variant of [`Cow`]
/// from an owned instance of [`Vec`].
///
/// This conversion does not allocate or clone the data.
///
/// [`Owned`]: crate::borrow::Cow::Owned
fn from(v: Vec<T>) -> Cow<'a, [T]> {
Cow::Owned(v)
}
}

#[stable(feature = "cow_from_vec_ref", since = "1.28.0")]
impl<'a, T: Clone> From<&'a Vec<T>> for Cow<'a, [T]> {
/// Creates a [`Borrowed`] variant of [`Cow`]
/// from a reference to [`Vec`].
///
/// This conversion does not allocate or clone the data.
///
/// [`Borrowed`]: crate::borrow::Cow::Borrowed
fn from(v: &'a Vec<T>) -> Cow<'a, [T]> {
Cow::Borrowed(v.as_slice())
}
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