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Auto merge of #110729 - ColinFinck:decode-utf16-fused-iterator, r=dtolnay

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Implement FusedIterator for DecodeUtf16 when the inner iterator does

I have just implemented an iterator that wraps `DecodeUtf16` and wanted to implement `FusedIterator` for my iterator when I noticed that `DecodeUtf16` currently doesn't implement `FusedIterator` at all.
A quick look at the code of `DecodeUtf16` revealed that `DecodeUtf16::next` only returns `None` when its inner iterator returns `None`:
3462f79e94/library/core/src/char/decode.rs (L45)

As a result, we can implement `FusedIterator` for `DecodeUtf16` when the inner iterator does.

I'm following the example of #96397 here and consider this change minor and non-controversial, which is why I haven't added an RFC. I have also added the required feature name (`"decode_utf16_fused_iterator"`), however without adding a chapter to the Rust Unstable book (same as #96397).
This commit is contained in:
bors 2023-10-15 17:09:37 +00:00
commit 64368d0279
1 changed files with 4 additions and 0 deletions
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4
library/core/src/char/decode.rs
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@ -2,6 +2,7 @@
use crate::error::Error;
use crate::fmt;
use crate::iter::FusedIterator;
/// An iterator that decodes UTF-16 encoded code points from an iterator of `u16`s.
///
@ -105,6 +106,9 @@ impl<I: Iterator<Item = u16>> Iterator for DecodeUtf16<I> {
}
}
#[stable(feature = "decode_utf16_fused_iterator", since = "CURRENT_RUSTC_VERSION")]
impl<I: Iterator<Item = u16> + FusedIterator> FusedIterator for DecodeUtf16<I> {}
impl DecodeUtf16Error {
/// Returns the unpaired surrogate which caused this error.
#[must_use]