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Rollup merge of #76139 - CDirkx:cow-is-borrowed, r=ecstatic-morse

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Make `cow_is_borrowed` methods const

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

Analogous to the const methods `is_some` and `is_none` for Option, and `is_ok` and `is_err` for Result.

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:
Tyler Mandry 2020-08-31 19:18:21 -07:00 • committed by GitHub
commit c307e90daa
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2 changed files with 17 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 @@ impl<B: ?Sized + ToOwned> Cow<'_, B> {
/// 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()
}