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hybrid-array: impl Default for Array #905

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Merged
tarcieri merged 1 commit into from
May 30, 2023
Merged

hybrid-array: impl Default for Array #905

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29 changes: 19 additions & 10 deletions hybrid-array/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -244,6 +244,16 @@ where
}
}

/// Generate a [`TryFromSliceError`] if the slice doesn't match the given length.
fn check_slice_length<T, U: Unsigned>(slice: &[T]) -> Result<(), TryFromSliceError> {
if slice.len() != U::USIZE {
// Hack: `TryFromSliceError` lacks a public constructor
<&[T; 1]>::try_from([].as_slice())?;
}

Ok(())
}

/// Byte array type.
pub type ByteArray<U> = Array<u8, U>;

Expand Down Expand Up @@ -398,6 +408,15 @@ macro_rules! impl_array_size {
}
}

impl<T> Default for Array<T, typenum::$ty>
where
T: Default
{
fn default() -> Self {
Self([(); $len].map(|_| T::default()))
}
}

impl<T> IntoIterator for Array<T, typenum::$ty> {
type Item = T;
type IntoIter = IntoIter<T, $len>;
Expand Down Expand Up @@ -512,13 +531,3 @@ impl_array_size! {
4096 => U4096,
8192 => U8192
}

/// Generate a [`TryFromSliceError`] if the slice doesn't match the given length.
fn check_slice_length<T, U: Unsigned>(slice: &[T]) -> Result<(), TryFromSliceError> {
if slice.len() != U::USIZE {
// Hack: `TryFromSliceError` lacks a public constructor
<&[T; 1]>::try_from([].as_slice())?;
}

Ok(())
}