Improve size_hint bounds for DecodeUtf16 iterator#88763
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steffahn wants to merge 2 commits intorust-lang:masterfrom
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Improve size_hint bounds for DecodeUtf16 iterator#88763steffahn wants to merge 2 commits intorust-lang:masterfrom
size_hint bounds for DecodeUtf16 iterator#88763steffahn wants to merge 2 commits intorust-lang:masterfrom
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r? @scottmcm (rust-highfive has picked a reviewer for you, use r? to override) |
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There’s the option of also inspecting |
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Also missing tests. I’m going to create an alternative version that does inspect @rustbot label S-waiting-on-author -S-waiting-on-review |
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@steffahn Ping from triage, any updates on this? |
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…16_size_hint, r=dtolnay Make `char::DecodeUtf16::size_hist` more precise New implementation takes into account contents of `self.buf` and rounds lower bound up instead of down. Fixes rust-lang#88762 Revival of rust-lang#88763
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…16_size_hint, r=dtolnay Make `char::DecodeUtf16::size_hist` more precise New implementation takes into account contents of `self.buf` and rounds lower bound up instead of down. Fixes rust-lang#88762 Revival of rust-lang#88763
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If at most 2
u16s make up one item in the iterator, then there has to be a minimum oflen + 1 / 2elements for an odd-numbered iterator. In other words, the best lower bound would be determined by rounding up.Edit: I noticed #88762 while creating a PR including just bea5cd1. So now, I’ve added a commit that fixes #88762 as-well.