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Implement TryFrom<&'_ mut [T]> for [T; N]

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This commit is contained in:
rhysd 2021-11-20 21:40:41 +09:00
parent 6d48ee90f5
commit 72b411fd89
2 changed files with 24 additions and 1 deletions
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12
library/core/src/array/mod.rs
View File

@ -176,6 +176,18 @@ fn borrow_mut(&mut self) -> &mut [T] {
}
}
#[stable(feature = "try_from_mut_slice_to_array", since = "1.57.0")]
impl<T, const N: usize> TryFrom<&mut [T]> for [T; N]
where
T: Copy,
{
type Error = TryFromSliceError;
fn try_from(slice: &mut [T]) -> Result<[T; N], TryFromSliceError> {
<Self>::try_from(slice.as_ref())
}
}
#[stable(feature = "try_from", since = "1.34.0")]
impl<'a, T, const N: usize> TryFrom<&'a [T]> for &'a [T; N] {
type Error = TryFromSliceError;

13
library/core/tests/array.rs
View File

@ -28,11 +28,22 @@ macro_rules! test {
($($N:expr)+) => {
$({
type Array = [u8; $N];
let array: Array = [0; $N];
let mut array: Array = [0; $N];
let slice: &[u8] = &array[..];
let result = <&Array>::try_from(slice);
assert_eq!(&array, result.unwrap());
let result = <Array>::try_from(slice);
assert_eq!(&array, &result.unwrap());
let mut_slice: &mut [u8] = &mut array[..];
let result = <&mut Array>::try_from(mut_slice);
assert_eq!(&[0; $N], result.unwrap());
let mut_slice: &mut [u8] = &mut array[..];
let result = <Array>::try_from(mut_slice);
assert_eq!(&array, &result.unwrap());
})+
}
}