parity_scale_codec/
keyedvec.rs

1// Copyright 2017, 2018 Parity Technologies
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15//! Serializer and prepender.
16
17use core::iter::Extend;
18
19use crate::alloc::vec::Vec;
20use crate::codec::Codec;
21
22/// Trait to allow itself to be serialised and prepended by a given slice.
23pub trait KeyedVec {
24	/// Return an encoding of `Self` prepended by given slice.
25	fn to_keyed_vec(&self, prepend_key: &[u8]) -> Vec<u8>;
26}
27
28impl<T: Codec> KeyedVec for T {
29	fn to_keyed_vec(&self, prepend_key: &[u8]) -> Vec<u8> {
30		self.using_encoded(|slice| {
31			let mut r = prepend_key.to_vec();
32			r.extend(slice);
33			r
34		})
35	}
36}
parity_scale_codec/keyedvec.rs

parity_scale_codec/
keyedvec.rs
