Add .as_bytes() -> &[u8] to ASCII strings.

Author: SimonSapin

src/lib.rs

@@ -262,6 +262,9 @@ impl OwnedAsciiCast<[u8]> for Vec<u8> {
 pub trait AsciiStr for Sized? {
     /// Convert to a string.
     fn as_str<'a>(&'a self) -> &'a str;
+
+    /// Convert to bytes.
+    fn as_bytes<'a>(&'a self) -> &'a [u8];
 }
 
 #[experimental = "may be replaced by generic conversion traits"]
@@ -270,6 +273,11 @@ impl AsciiStr for [Ascii] {
     fn as_str<'a>(&'a self) -> &'a str {
         unsafe { mem::transmute(self) }
     }
+
+    #[inline]
+    fn as_bytes<'a>(&'a self) -> &'a [u8] {
+        unsafe { mem::transmute(self) }
+    }
 }
 
 impl IntoString for Vec<Ascii> {
@@ -356,6 +364,12 @@ mod tests {
         assert_eq!(v.as_str(), "( ;");
     }
 
+    #[test]
+    fn test_ascii_as_bytes() {
+        let v = v2ascii!([40, 32, 59]);
+        assert_eq!(v.as_bytes(), b"( ;");
+    }
+
     #[test]
     fn test_ascii_into_string() {
         assert_eq!(vec2ascii![40, 32, 59].into_string(), "( ;".to_string());