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str::is_char_boundary - slight optimization

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Soveu
2021-04-30 16:13:00 +02:00
parent 49920bc581
commit 2ea0410f09
1 changed files with 2 additions and 2 deletions
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4
library/core/src/str/mod.rs
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@@ -195,11 +195,11 @@ impl str {
// 0 and len are always ok. // 0 and len are always ok.
// Test for 0 explicitly so that it can optimize out the check // Test for 0 explicitly so that it can optimize out the check
// easily and skip reading string data for that case. // easily and skip reading string data for that case.
if index == 0 || index == self.len() { if index == 0 {
return true; return true;
} }
match self.as_bytes().get(index) { match self.as_bytes().get(index) {
None => false, None => index == self.len(),
// This is bit magic equivalent to: b < 128 || b >= 192 // This is bit magic equivalent to: b < 128 || b >= 192
Some(&b) => (b as i8) >= -0x40, Some(&b) => (b as i8) >= -0x40,
} }