[WIP] Implement FusedIterator #32999
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This trait can be used to avoid the overhead of a fuse wrapper (which is pretty high).
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r? @aturon (rust_highfive has picked a reviewer for you, use r? to override) |
| #[stable(feature = "rust1", since = "1.0.0")] | ||
| impl<I> Iterator for Fuse<I> where I: Iterator { | ||
| type Item = <I as Iterator>::Item; | ||
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| #[inline] | ||
| fn next(&mut self) -> Option<<I as Iterator>::Item> { | ||
| default fn next(&mut self) -> Option<<I as Iterator>::Item> { |
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Unless I'm mistaken, that doesn't apply here (yet) because we don't have the lattice rule. That is, a specialized implementation would have to have the bound I: FusedIterator + Something and the implementation on FusedIterator isn't marked default. However, that's a good point. I'll make a note of this on the specialization issue.
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I think the RFC link is to the wrong repo, should be rust-lang/rfcs#1581 |
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@hexsel github auto-linking... thanks. |
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@Stebalien Here's another way this could be done: https://play.rust-lang.org/?gist=1c74c425ab7f916b691053348b27cb61&version=nightly&backtrace=0. |
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☔ The latest upstream changes (presumably #33079) made this pull request unmergeable. Please resolve the merge conflicts. |
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@apasel422 that certainly gets rid of the unnecessary |
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Closing due to inactivity, but feel free to reopen once the RFC is accepted! |
Pending RFC rust-lang/rfcs#1581
Only implements FusedIterator for core.
/cc @bluss, @apasel422