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Add example for str::subslice_offset

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This commit is contained in:
Marvin Löbel 2013-04-11 00:48:31 +02:00
parent 9a16179fd3
commit 4ad76e66aa
1 changed files with 19 additions and 0 deletions
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19
src/libcore/str.rs
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@ -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]