49 lines
1.2 KiB
Rust
49 lines
1.2 KiB
Rust
//! This module contains the parallel iterator types for owned strings
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//! (`String`). You will rarely need to interact with it directly
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//! unless you have need to name one of the iterator types.
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use crate::iter::plumbing::*;
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use crate::math::simplify_range;
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use crate::prelude::*;
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use std::ops::{Range, RangeBounds};
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impl<'a> ParallelDrainRange<usize> for &'a mut String {
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type Iter = Drain<'a>;
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type Item = char;
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fn par_drain<R: RangeBounds<usize>>(self, range: R) -> Self::Iter {
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Drain {
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range: simplify_range(range, self.len()),
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string: self,
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}
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}
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}
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/// Draining parallel iterator that moves a range of characters out of a string,
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/// but keeps the total capacity.
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#[derive(Debug)]
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pub struct Drain<'a> {
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string: &'a mut String,
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range: Range<usize>,
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}
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impl<'a> ParallelIterator for Drain<'a> {
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type Item = char;
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fn drive_unindexed<C>(self, consumer: C) -> C::Result
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where
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C: UnindexedConsumer<Self::Item>,
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{
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self.string[self.range.clone()]
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.par_chars()
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.drive_unindexed(consumer)
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}
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}
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impl<'a> Drop for Drain<'a> {
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fn drop(&mut self) {
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// Remove the drained range.
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self.string.drain(self.range.clone());
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}
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}
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