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Auto merge of #7776 - frewsxcv:str-join, r=mbrubeck

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Avoid allocations when joining strings



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This commit is contained in:
bors-servo 2015-09-29 16:59:14 -06:00
commit 4823ec947e
5 changed files with 11 additions and 12 deletions
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6
components/util/str.rs
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@ -326,8 +326,10 @@ pub unsafe fn c_str_to_string(s: *const c_char) -> String {
from_utf8(CStr::from_ptr(s).to_bytes()).unwrap().to_owned()
}
pub fn str_join<T: AsRef<str>>(strs: &[T], join: &str) -> String {
strs.iter().fold(String::new(), |mut acc, s| {
pub fn str_join<I, T>(strs: I, join: &str) -> String
where I: IntoIterator<Item=T>, T: AsRef<str>,
{
strs.into_iter().fold(String::new(), |mut acc, s| {
if !acc.is_empty() { acc.push_str(join); }
acc.push_str(s.as_ref());
acc