43 lines
1.2 KiB
Rust
43 lines
1.2 KiB
Rust
// Copyright 2015, 2016 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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pub trait Forkable {
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fn fork(self, fork_number: usize) -> Self where Self: Sized;
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}
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pub struct Fork<I> {
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pub iter: I,
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pub fork_number: usize,
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}
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impl<I> Clone for Fork<I> where I: Iterator + Clone {
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fn clone(&self) -> Self {
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Fork {
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iter: self.iter.clone(),
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fork_number: self.fork_number
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}
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}
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}
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impl<I> Iterator for Fork<I> where I: Iterator, <I as Iterator>::Item: Forkable {
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type Item = <I as Iterator>::Item;
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#[inline]
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fn next(&mut self) -> Option<Self::Item> {
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self.iter.next().map(|item| item.fork(self.fork_number))
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}
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}
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