diff --git a/src/ascii_char.rs b/src/ascii_char.rs
index 39f2ceb..a9a529e 100644
--- a/src/ascii_char.rs
+++ b/src/ascii_char.rs
@@ -431,6 +431,18 @@ impl AsciiChar {
self as u8 as char
}
+ /// Converts an ASCII character into a `&str`.
+ #[inline]
+ pub const fn as_str(&self) -> &str {
+ unsafe {
+ // SAFETY: Self is repr(u8) so casting *const Self to *const u8 is valid,
+ // and casting a *const T to *const [T; 1] is always valid (see core::array::from_ref).
+ let slice = &*(self as *const Self as *const [u8; 1]);
+ // SAFETY: an ASCII char is always valid UTF-8
+ core::str::from_utf8_unchecked(slice)
+ }
+ }
+
// the following methods are like ctype, and the implementation is inspired by musl.
// The ascii_ methods take self by reference for maximum compatibility
// with the corresponding methods on u8 and char.
@@ -999,6 +1011,11 @@ mod tests {
assert_eq!(AsciiChar::A.as_char(), 'A');
}
+ #[test]
+ fn as_str() {
+ assert_eq!(AsciiChar::A.as_str(), "A");
+ }
+
#[test]
fn new_array_is_correct() {
for byte in 0..128_u8 {
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