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Disable AsRef implementations for String's Drain.

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Since trait implementations cannot be unstable, we should only add them
when the as_str feature gets stabilized. Until then, only `.as_str()` is
available (behind a feature gate).
This commit is contained in:
Mara Bos 2020-09-09 19:38:51 +02:00
parent f2a32909e0
commit 829019d404
1 changed files with 15 additions and 14 deletions
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29
library/alloc/src/string.rs
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@ -2475,25 +2475,26 @@ impl<'a> Drain<'a> {
/// let _ = drain.next().unwrap();
/// assert_eq!(drain.as_str(), "bc");
/// ```
#[unstable(feature = "string_drain_as_str", issue = "none")]
#[unstable(feature = "string_drain_as_str", issue = "none")] // Note: uncomment AsRef impls below when stabilizing.
pub fn as_str(&self) -> &str {
self.iter.as_str()
}
}
#[stable(feature = "string_drain_as_ref", since = "1.48.0")]
impl<'a> AsRef<str> for Drain<'a> {
fn as_ref(&self) -> &str {
self.as_str()
}
}
#[stable(feature = "string_drain_as_ref", since = "1.48.0")]
impl<'a> AsRef<[u8]> for Drain<'a> {
fn as_ref(&self) -> &[u8] {
self.as_str().as_bytes()
}
}
// Uncomment when stabilizing `string_drain_as_str`.
// #[unstable(feature = "string_drain_as_str", issue = "none")]
// impl<'a> AsRef<str> for Drain<'a> {
// fn as_ref(&self) -> &str {
// self.as_str()
// }
// }
//
// #[unstable(feature = "string_drain_as_str", issue = "none")]
// impl<'a> AsRef<[u8]> for Drain<'a> {
// fn as_ref(&self) -> &[u8] {
// self.as_str().as_bytes()
// }
// }
#[stable(feature = "drain", since = "1.6.0")]
impl Iterator for Drain<'_> {