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Make cow_is_borrowed methods const

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Constify the following methods of `alloc::borrow::Cow`:
 - `is_borrowed`
 - `is_owned`

These methods are still unstable under `cow_is_borrowed`.
Possible because of #49146 (Allow if and match in constants).

Tracking issue: #65143
This commit is contained in:
CDirkx 2020-08-31 03:43:47 +02:00
parent 36b0d7e257
commit af24bdbd96
1 changed files with 2 additions and 2 deletions
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4
library/alloc/src/borrow.rs
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@ -217,7 +217,7 @@ impl<B: ?Sized + ToOwned> Cow<'_, B> {
/// assert!(!bull.is_borrowed());
/// ```
#[unstable(feature = "cow_is_borrowed", issue = "65143")]
pub fn is_borrowed(&self) -> bool {
pub const fn is_borrowed(&self) -> bool {
match *self {
Borrowed(_) => true,
Owned(_) => false,
@ -239,7 +239,7 @@ pub fn is_borrowed(&self) -> bool {
/// assert!(!bull.is_owned());
/// ```
#[unstable(feature = "cow_is_borrowed", issue = "65143")]
pub fn is_owned(&self) -> bool {
pub const fn is_owned(&self) -> bool {
!self.is_borrowed()
}