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perf(header): move a branch out of a loop in fmt_comma_delimited

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Sean McArthur
2017-05-25 10:31:20 -07:00
parent 6d8071b3ce
commit 40c575cc59
1 changed files with 6 additions and 4 deletions
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8
src/header/parsing.rs
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@@ -44,10 +44,12 @@ pub fn from_comma_delimited<T: str::FromStr>(raw: &Raw) -> ::Result<Vec<T>> {
/// Format an array into a comma-delimited string. /// Format an array into a comma-delimited string.
pub fn fmt_comma_delimited<T: Display>(f: &mut fmt::Formatter, parts: &[T]) -> fmt::Result { pub fn fmt_comma_delimited<T: Display>(f: &mut fmt::Formatter, parts: &[T]) -> fmt::Result {
for (i, part) in parts.iter().enumerate() { let mut iter = parts.iter();
if i != 0 { if let Some(part) = iter.next() {
try!(f.write_str(", ")); try!(Display::fmt(part, f));
} }
for part in iter {
try!(f.write_str(", "));
try!(Display::fmt(part, f)); try!(Display::fmt(part, f));
} }
Ok(()) Ok(())