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(imported from improperly closed bugrust-lang/rust#20658 )
So, the good news is that this cargo package is beating the deprecated stdlib code on my machine.
The bad news is that it is still slower than what the original issue author expects to see.
(Though I also don't think the original issue author's code is conformant with what the docs here say thefn width method should do onchar.)
Anyway, here is a port of the benchmark provided by the original author, adapted to also test this cargo package. It is followed with the benchmark results on my machine.
#![feature(test, unicode)]externcrate test;externcrate unicode_width;use test::{Bencher};use unicode_width::UnicodeWidthChar;constSTRING:&'staticstr ="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";#[bench]fnstdlib(b:&mutBencher){ b.iter(||{for cinSTRING.chars(){ test::black_box(c.width(false));}});}#[bench]fncargo(b:&mutBencher){ b.iter(||{for cinSTRING.chars(){ test::black_box(UnicodeWidthChar::width(c));}});}#[bench]fnsimple(b:&mutBencher){ b.iter(||{for cinSTRING.chars(){if(casu32) <127{if(casu32) >31{ test::black_box(Some(1));}else{ test::black_box(None::<usize>);}}else{ test::black_box(c.width(false));}}});}
03-03-58 char_fast_path/char_fast_path (git:fsk-sized-bounded-iter) % rustc --versionrustc 1.0.0-nightly (1284be404 2015-04-18) (built 2015-04-17)03-04-12 char_fast_path/char_fast_path (git:fsk-sized-bounded-iter) % cargo bench Running target/release/char_fast_path-935b3c19b07d9282running 3 teststest cargo ... bench: 3197 ns/iter (+/- 401)test simple ... bench: 1465 ns/iter (+/- 500)test stdlib ... bench: 3427 ns/iter (+/- 571)test result: ok. 0 passed; 0 failed; 0 ignored; 3 measured03-04-21 char_fast_path/char_fast_path (git:fsk-sized-bounded-iter) %Metadata
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