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Implement str to [u8] conversion for refcounted containers

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This commit is contained in:
John-John Tedro 2022-04-15 14:34:54 +02:00
parent e7575f9670
commit 594be707c4
2 changed files with 38 additions and 0 deletions
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19
library/alloc/src/rc.rs
View File

@ -1956,6 +1956,25 @@ where
}
}
#[stable(feature = "shared_from_str", since = "1.61.0")]
impl From<Rc<str>> for Rc<[u8]> {
/// Converts a reference-counted string slice into a byte slice.
///
/// # Example
///
/// ```
/// # use std::rc::Rc;
/// let string: Rc<str> = Rc::from("eggplant");
/// let bytes: Rc<[u8]> = Rc::from(string);
/// assert_eq!("eggplant".as_bytes(), bytes.as_ref());
/// ```
#[inline]
fn from(rc: Rc<str>) -> Self {
// SAFETY: `str` has the same layout as `[u8]`.
unsafe { Rc::from_raw(Rc::into_raw(rc) as *const [u8]) }
}
}
#[stable(feature = "boxed_slice_try_from", since = "1.43.0")]
impl<T, const N: usize> TryFrom<Rc<[T]>> for Rc<[T; N]> {
type Error = Rc<[T]>;

19
library/alloc/src/sync.rs
View File

@ -2556,6 +2556,25 @@ where
}
}
#[stable(feature = "shared_from_str", since = "1.61.0")]
impl From<Arc<str>> for Arc<[u8]> {
/// Converts an atomically reference-counted string slice into a byte slice.
///
/// # Example
///
/// ```
/// # use std::sync::Arc;
/// let string: Arc<str> = Arc::from("eggplant");
/// let bytes: Arc<[u8]> = Arc::from(string);
/// assert_eq!("eggplant".as_bytes(), bytes.as_ref());
/// ```
#[inline]
fn from(rc: Arc<str>) -> Self {
// SAFETY: `str` has the same layout as `[u8]`.
unsafe { Arc::from_raw(Arc::into_raw(rc) as *const [u8]) }
}
}
#[stable(feature = "boxed_slice_try_from", since = "1.43.0")]
impl<T, const N: usize> TryFrom<Arc<[T]>> for Arc<[T; N]> {
type Error = Arc<[T]>;