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23 lines
662 B
Rust
23 lines
662 B
Rust
use std::borrow::Cow;
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use heed::{BytesDecode, BytesEncode};
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/// A codec for values of type `&str`. Unlike `Str`, its `EItem` and `DItem` associated
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/// types are equivalent (= `&'a str`) and these values can reside within another structure.
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pub struct StrRefCodec;
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impl<'a> BytesEncode<'a> for StrRefCodec {
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type EItem = &'a str;
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fn bytes_encode(item: &'a &'a str) -> Option<Cow<'a, [u8]>> {
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Some(Cow::Borrowed(item.as_bytes()))
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}
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}
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impl<'a> BytesDecode<'a> for StrRefCodec {
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type DItem = &'a str;
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fn bytes_decode(bytes: &'a [u8]) -> Option<Self::DItem> {
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let s = std::str::from_utf8(bytes).ok()?;
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Some(s)
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}
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}
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