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(core::str) use slice_bytes in starts_with for a little bit less string traversal

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This commit is contained in:
Kevin Cantu 2012-02-12 17:33:45 -08:00
parent 8309d50ff4
commit 0e61fe2eea
1 changed files with 4 additions and 4 deletions
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8
src/libcore/str.rs
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@ -932,12 +932,12 @@ Parameters:
haystack - The string to look in
needle - The string to look for
*/
fn starts_with(haystack: str, needle: str) -> bool {
let haystack_len: uint = len(haystack);
let needle_len: uint = len(needle);
fn starts_with(haystack: str, needle: str) -> bool unsafe {
let haystack_len: uint = len_bytes(haystack);
let needle_len: uint = len_bytes(needle);
if needle_len == 0u { ret true; }
if needle_len > haystack_len { ret false; }
ret eq(substr(haystack, 0u, needle_len), needle);
ret eq(unsafe::slice_bytes(haystack, 0u, needle_len), needle);
}
/*