diff options
| -rw-r--r-- | src/libcore/str.rs | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/libcore/str.rs b/src/libcore/str.rs index a0b78bc22b6..2201836c724 100644 --- a/src/libcore/str.rs +++ b/src/libcore/str.rs @@ -2056,6 +2056,18 @@ pub fn as_buf<T>(s: &str, f: &fn(*u8, uint) -> T) -> T { /** * Returns the byte offset of an inner slice relative to an enclosing outer slice + * + * # Example + * + * ~~~ + * let string = "a\nb\nc"; + * let mut lines = ~[]; + * for each_line(string) |line| { lines.push(line) } + * + * assert!(subslice_offset(string, lines[0]) == 0); // &"a" + * assert!(subslice_offset(string, lines[1]) == 2); // &"b" + * assert!(subslice_offset(string, lines[2]) == 4); // &"c" + * ~~~ */ #[inline(always)] pub fn subslice_offset(outer: &str, inner: &str) -> uint { @@ -3461,6 +3473,13 @@ mod tests { let c = slice(a, 0, len(a) - 6); assert!(subslice_offset(a, b) == 7); assert!(subslice_offset(a, c) == 0); + + let string = "a\nb\nc"; + let mut lines = ~[]; + for each_line(string) |line| { lines.push(line) } + assert!(subslice_offset(string, lines[0]) == 0); + assert!(subslice_offset(string, lines[1]) == 2); + assert!(subslice_offset(string, lines[2]) == 4); } #[test] |