1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
// Copyright 2018-2022 Parity Technologies (UK) Ltd.
//
// 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.
use super::SpreadLayout;
use ink_primitives::Key;
pub use ink_primitives::KeyPtr;
/// Extension trait to make `KeyPtr` simpler to use for `T: SpreadLayout` types.
pub trait ExtKeyPtr {
/// Advances the key pointer by the same amount of the footprint of the
/// generic type parameter of `T` and returns the old value.
fn next_for<T>(&mut self) -> &Key
where
T: SpreadLayout;
}
impl ExtKeyPtr for KeyPtr {
fn next_for<T>(&mut self) -> &Key
where
T: SpreadLayout,
{
self.advance_by(<T as SpreadLayout>::FOOTPRINT)
}
}