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