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//! This module contains the parallel iterator types for hash sets
//! (`HashSet<T>`). You will rarely need to interact with it directly
//! unless you have need to name one of the iterator types.
use std::collections::HashSet;
use std::hash::{BuildHasher, Hash};
use std::marker::PhantomData;
use crate::iter::plumbing::*;
use crate::iter::*;
use crate::vec;
/// Parallel iterator over a hash set
#[derive(Debug)] // std doesn't Clone
pub struct IntoIter<T: Hash + Eq + Send> {
inner: vec::IntoIter<T>,
}
into_par_vec! {
HashSet<T, S> => IntoIter<T>,
impl<T: Hash + Eq + Send, S: BuildHasher>
}
delegate_iterator! {
IntoIter<T> => T,
impl<T: Hash + Eq + Send>
}
/// Parallel iterator over an immutable reference to a hash set
#[derive(Debug)]
pub struct Iter<'a, T: Hash + Eq + Sync> {
inner: vec::IntoIter<&'a T>,
}
impl<'a, T: Hash + Eq + Sync> Clone for Iter<'a, T> {
fn clone(&self) -> Self {
Iter {
inner: self.inner.clone(),
}
}
}
into_par_vec! {
&'a HashSet<T, S> => Iter<'a, T>,
impl<'a, T: Hash + Eq + Sync, S: BuildHasher>
}
delegate_iterator! {
Iter<'a, T> => &'a T,
impl<'a, T: Hash + Eq + Sync + 'a>
}
// `HashSet` doesn't have a mutable `Iterator`
/// Draining parallel iterator that moves out of a hash set,
/// but keeps the total capacity.
#[derive(Debug)]
pub struct Drain<'a, T: Hash + Eq + Send> {
inner: vec::IntoIter<T>,
marker: PhantomData<&'a mut HashSet<T>>,
}
impl<'a, T: Hash + Eq + Send, S: BuildHasher> ParallelDrainFull for &'a mut HashSet<T, S> {
type Iter = Drain<'a, T>;
type Item = T;
fn par_drain(self) -> Self::Iter {
let vec: Vec<_> = self.drain().collect();
Drain {
inner: vec.into_par_iter(),
marker: PhantomData,
}
}
}
delegate_iterator! {
Drain<'_, T> => T,
impl<T: Hash + Eq + Send>
}