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mrustc (master)
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pub fn is_char_boundary(s: &str, index: usize) -> bool { // 0 and len are always ok. // Test for 0 explicitly so that it can optimize out the check // easily and skip reading string data for that case. if index == 0 || index == s.len() { return true; } match s.as_bytes().get(index) { None => false, // This is bit magic equivalent to: b < 128 || b >= 192 Some(&b) => (b as i8) >= -0x40, } } pub fn is_char_boundary2(s: &str, index: usize) -> bool { if index == 0 { return true; } match s.as_bytes().get(index) { // For some reason, LLVM likes this comparison here more None => index == s.len(), // This is bit magic equivalent to: b < 128 || b >= 192 Some(&b) => (b as i8) >= -0x40, } }
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