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Squirrel
1b5f4243d1
This PR removes sp-std crate from substrate/primitives sub-directories. For now crates that have `pub use` of sp-std or export macros that would necessitate users of the macros to `extern crate alloc` have been excluded from this PR. There should be no breaking changes in this PR. --------- Co-authored-by: Koute <koute@users.noreply.github.com>
69 lines
2.0 KiB
Rust
69 lines
2.0 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Primitives for Substrate Proof-of-Work (PoW) consensus.
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#![cfg_attr(not(feature = "std"), no_std)]
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extern crate alloc;
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#[cfg(not(feature = "std"))]
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use alloc::vec::Vec;
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use codec::Decode;
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use sp_runtime::ConsensusEngineId;
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/// The `ConsensusEngineId` of PoW.
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pub const POW_ENGINE_ID: ConsensusEngineId = [b'p', b'o', b'w', b'_'];
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/// Type of seal.
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pub type Seal = Vec<u8>;
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/// Define methods that total difficulty should implement.
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pub trait TotalDifficulty {
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fn increment(&mut self, other: Self);
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}
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impl TotalDifficulty for sp_core::U256 {
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fn increment(&mut self, other: Self) {
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let ret = self.saturating_add(other);
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*self = ret;
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}
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}
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impl TotalDifficulty for u128 {
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fn increment(&mut self, other: Self) {
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let ret = self.saturating_add(other);
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*self = ret;
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}
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}
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sp_api::decl_runtime_apis! {
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/// API necessary for timestamp-based difficulty adjustment algorithms.
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pub trait TimestampApi<Moment: Decode> {
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/// Return the timestamp in the current block.
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fn timestamp() -> Moment;
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}
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/// API for those chains that put their difficulty adjustment algorithm directly
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/// onto runtime. Note that while putting difficulty adjustment algorithm to
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/// runtime is safe, putting the PoW algorithm on runtime is not.
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pub trait DifficultyApi<Difficulty: Decode> {
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/// Return the target difficulty of the next block.
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fn difficulty() -> Difficulty;
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}
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}
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