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Implement Mutable trait for StrBuf #14110

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Merged
bors merged 1 commit into from
May 12, 2014
Merged

Implement Mutable trait for StrBuf #14110

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18 changes: 17 additions & 1 deletion src/libstd/strbuf.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@
use c_vec::CVec;
use cast;
use char::Char;
use container::Container;
use container::{Container, Mutable};
use fmt;
use io::Writer;
use iter::{Extendable, FromIterator, Iterator, range};
Expand Down Expand Up @@ -245,6 +245,13 @@ impl Container for StrBuf {
}
}

impl Mutable for StrBuf {
#[inline]
fn clear(&mut self) {
self.vec.clear()
}
}

impl FromIterator<char> for StrBuf {
fn from_iter<I:Iterator<char>>(iterator: I) -> StrBuf {
let mut buf = StrBuf::new();
Expand Down Expand Up @@ -298,6 +305,7 @@ impl<H:Writer> ::hash::Hash<H> for StrBuf {
#[cfg(test)]
mod tests {
extern crate test;
use container::{Container, Mutable};
use self::test::Bencher;
use str::{Str, StrSlice};
use super::StrBuf;
Expand Down Expand Up @@ -380,4 +388,12 @@ mod tests {
let mut s = StrBuf::from_str("\u00FC"); // ü
s.truncate(1);
}

#[test]
fn test_str_clear() {
let mut s = StrBuf::from_str("12345");
s.clear();
assert_eq!(s.len(), 0);
assert_eq!(s.as_slice(), "");
}
}