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// Copyright 2017, 2018 Parity Technologies // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. //! Serialiser and prepender. use core::iter::Extend; use crate::alloc::vec::Vec; use crate::codec::Codec; /// Trait to allow itself to be serialised and prepended by a given slice. pub trait KeyedVec { /// Return an encoding of `Self` prepended by given slice. fn to_keyed_vec(&self, prepend_key: &[u8]) -> Vec<u8>; } impl<T: Codec> KeyedVec for T { fn to_keyed_vec(&self, prepend_key: &[u8]) -> Vec<u8> { self.using_encoded(|slice| { let mut r = prepend_key.to_vec(); r.extend(slice); r }) } }