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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:03:36 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:03:36 +0000 |
commit | 17d40c6057c88f4c432b0d7bac88e1b84cb7e67f (patch) | |
tree | 3f66c4a5918660bb8a758ab6cda5ff8ee4f6cdcd /src/tools/clippy/src/docs/naive_bytecount.txt | |
parent | Adding upstream version 1.64.0+dfsg1. (diff) | |
download | rustc-upstream/1.65.0+dfsg1.tar.xz rustc-upstream/1.65.0+dfsg1.zip |
Adding upstream version 1.65.0+dfsg1.upstream/1.65.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/tools/clippy/src/docs/naive_bytecount.txt')
-rw-r--r-- | src/tools/clippy/src/docs/naive_bytecount.txt | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/tools/clippy/src/docs/naive_bytecount.txt b/src/tools/clippy/src/docs/naive_bytecount.txt new file mode 100644 index 000000000..24659dc79 --- /dev/null +++ b/src/tools/clippy/src/docs/naive_bytecount.txt @@ -0,0 +1,22 @@ +### What it does +Checks for naive byte counts + +### Why is this bad? +The [`bytecount`](https://crates.io/crates/bytecount) +crate has methods to count your bytes faster, especially for large slices. + +### Known problems +If you have predominantly small slices, the +`bytecount::count(..)` method may actually be slower. However, if you can +ensure that less than 2³²-1 matches arise, the `naive_count_32(..)` can be +faster in those cases. + +### Example +``` +let count = vec.iter().filter(|x| **x == 0u8).count(); +``` + +Use instead: +``` +let count = bytecount::count(&vec, 0u8); +```
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