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rustc_serialize: specialize opaque decoding of some u8 sequences

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This commit is contained in:
Tyson Nottingham 2020-12-16 21:03:45 -08:00
parent 7c6274d464
commit be79f493fb
5 changed files with 42 additions and 26 deletions
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11
compiler/rustc_serialize/src/serialize.rs
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@ -545,7 +545,7 @@ impl<S: Encoder, T: Encodable<S>> Encodable<S> for Vec<T> {
}
impl<D: Decoder, T: Decodable<D>> Decodable<D> for Vec<T> {
fn decode(d: &mut D) -> Result<Vec<T>, D::Error> {
default fn decode(d: &mut D) -> Result<Vec<T>, D::Error> {
d.read_seq(|d, len| {
let mut v = Vec::with_capacity(len);
for i in 0..len {
@ -591,13 +591,8 @@ where
[T]: ToOwned<Owned = Vec<T>>,
{
fn decode(d: &mut D) -> Result<Cow<'static, [T]>, D::Error> {
d.read_seq(|d, len| {
let mut v = Vec::with_capacity(len);
for i in 0..len {
v.push(d.read_seq_elt(i, |d| Decodable::decode(d))?);
}
Ok(Cow::Owned(v))
})
let v: Vec<T> = Decodable::decode(d)?;
Ok(Cow::Owned(v))
}
}