simdphrase 0.1.1

Extremely fast phrase search implementation.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

use std::{borrow::Cow, marker::PhantomData};

use rkyv::{
    api::high::HighSerializer, ser::allocator::ArenaHandle, util::AlignedVec, Archive, Archived,
    Serialize,
};

pub struct ZeroCopyCodec<T>(PhantomData<T>)
where
    T: for<'a> Serialize<HighSerializer<AlignedVec, ArenaHandle<'a>, rkyv::rancor::Error>>
        + Archive;

impl<'a, T> heed::BytesEncode<'a> for ZeroCopyCodec<T>
where
    T: for<'b> Serialize<HighSerializer<AlignedVec, ArenaHandle<'b>, rkyv::rancor::Error>>
        + Archive
        + 'a,
{
    type EItem = T;

    fn bytes_encode(item: &'a Self::EItem) -> Result<Cow<'a, [u8]>, heed::BoxedError> {
        let bytes = rkyv::to_bytes(item).map(|bytes| Cow::Owned(bytes.to_vec()));

        Ok(bytes?)
    }
}

impl<'a, T> heed::BytesDecode<'a> for ZeroCopyCodec<T>
where
    T: for<'b> Serialize<HighSerializer<AlignedVec, ArenaHandle<'b>, rkyv::rancor::Error>>
        + Archive
        + 'a,
{
    type DItem = &'a T::Archived;

    fn bytes_decode(bytes: &'a [u8]) -> Result<Self::DItem, heed::BoxedError> {
        unsafe { Ok(rkyv::access_unchecked::<Archived<T>>(bytes)) }
    }
}