Make Peekable remember peeking a None #37834
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Peekable must remember if a None has been seen in the `.peek()` method. It ensures that `.peek(); .peek();` or `.peek(); .next();` only advances the underlying iterator at most once. This does not by itself make the iterator fused.
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r? @aturon (rust_highfive has picked a reviewer for you, use r? to override) |
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cc @rust-lang/libs I consider this a bug-fix, but it does involve changing the behavior of a stable API. |
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👍 Would be cool to specialize for |
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I'm 👍 for this change, sounds good to me! |
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@bors: r+ |
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📌 Commit 6c2a456 has been approved by |
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Nov 22, 2016
Make Peekable remember peeking a None Peekable should remember if a None has been seen in the `.peek()` method. It ensures that `.peek(); .peek();` or `.peek(); .next();` only advances the underlying iterator at most once. This does not by itself make the iterator fused. Thanks to @s3bk for the code in `fn peek()` itself. Fixes #37784
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Peekable should remember if a None has been seen in the
.peek()method.It ensures that
.peek(); .peek();or.peek(); .next();only advances theunderlying iterator at most once. This does not by itself make the iterator
fused.
Thanks to @s3bk for the code in
fn peek()itself.Fixes #37784