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use std::borrow::Cow;
use heed_traits::{BytesDecode, BytesEncode};
use zerocopy::{AsBytes, FromBytes, LayoutVerified, Unaligned};
pub struct UnalignedSlice<T>(std::marker::PhantomData<T>);
impl<'a, T: 'a> BytesEncode<'a> for UnalignedSlice<T>
where
T: AsBytes + Unaligned,
{
type EItem = [T];
fn bytes_encode(item: &'a Self::EItem) -> Option<Cow<[u8]>> {
Some(Cow::Borrowed(<[T] as AsBytes>::as_bytes(item)))
}
}
impl<'a, T: 'a> BytesDecode<'a> for UnalignedSlice<T>
where
T: FromBytes + Unaligned,
{
type DItem = &'a [T];
fn bytes_decode(bytes: &'a [u8]) -> Option<Self::DItem> {
LayoutVerified::<_, [T]>::new_slice_unaligned(bytes).map(LayoutVerified::into_slice)
}
}
unsafe impl<T> Send for UnalignedSlice<T> {}
unsafe impl<T> Sync for UnalignedSlice<T> {}