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| author | Manish Goregaokar <manishsmail@gmail.com> | 2018-02-07 08:30:53 -0800 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2018-02-07 08:30:53 -0800 |
| commit | da6dcbc21ebfa62c58352c9129dc1e1b99d9b71f (patch) | |
| tree | bd0c7b88eca61cc2e3553c2d4479f96c1496e3b2 /src/test/incremental/thinlto | |
| parent | 0ba871254e97a72eb5ab43f26b42a943ab5f330d (diff) | |
| parent | 6caec2c0494a173f696e5a63583ff35d1bd106aa (diff) | |
| download | rust-da6dcbc21ebfa62c58352c9129dc1e1b99d9b71f.tar.gz rust-da6dcbc21ebfa62c58352c9129dc1e1b99d9b71f.zip | |
Rollup merge of #47944 - oberien:unboundediterator-trustedlen, r=bluss
Implement TrustedLen for Take<Repeat> and Take<RangeFrom> This will allow optimization of simple `repeat(x).take(n).collect()` iterators, which are currently not vectorized and have capacity checks. This will only support a few aggregates on `Repeat` and `RangeFrom`, which might be enough for simple cases, but doesn't optimize more complex ones. Namely, Cycle, StepBy, Filter, FilterMap, Peekable, SkipWhile, Skip, FlatMap, Fuse and Inspect are not marked `TrustedLen` when the inner iterator is infinite. Previous discussion can be found in #47082 r? @alexcrichton
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