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Begin refactor for less allocation

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This commit is contained in:
Paul Hauner
2019-05-06 08:47:49 +10:00
parent acf854f558
commit daf6912d18
6 changed files with 82 additions and 68 deletions
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23
eth2/utils/ssz/examples/struct_definition.rs
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@@ -1,4 +1,4 @@
use ssz::{Decodable, DecodeError, Encodable, SszDecoderBuilder, SszStream};
use ssz::{encode_length, Decodable, DecodeError, Encodable, SszDecoderBuilder, SszStream};
#[derive(Debug, PartialEq)]
pub struct Foo {
@@ -12,14 +12,23 @@ impl Encodable for Foo {
<u16 as Encodable>::is_ssz_fixed_len() && <Vec<u16> as Encodable>::is_ssz_fixed_len()
}
fn as_ssz_bytes(&self) -> Vec<u8> {
let mut stream = SszStream::new();
fn ssz_append(&self, buf: &mut Vec<u8>) {
let offset = <u16 as Encodable>::ssz_fixed_len()
+ <Vec<u16> as Encodable>::ssz_fixed_len()
+ <u16 as Encodable>::ssz_fixed_len();
stream.append(&self.a);
stream.append(&self.b);
stream.append(&self.c);
let mut fixed = Vec::with_capacity(offset);
let mut variable = vec![];
stream.drain()
if <u16 as Encodable>::is_ssz_fixed_len() {
self.a.ssz_append(&mut fixed);
} else {
fixed.append(encode_length())
}
if <Vec<u16> as Encodable>::is_ssz_fixed_len() {
self.a.ssz_append(&mut fixed);
}
}
}