rayon 1.0.3

Simple work-stealing parallelism for Rust
Documentation 
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//! This module contains the parallel iterator types for hash maps
//! (`HashMap<K, V>`). You will rarely need to interact with it directly
//! unless you have need to name one of the iterator types.

use std::collections::HashMap;
use std::hash::{Hash, BuildHasher};

use iter::*;
use iter::plumbing::*;

use vec;

/// Parallel iterator over a hash map
#[derive(Debug)] // std doesn't Clone
pub struct IntoIter<K: Hash + Eq + Send, V: Send> {
    inner: vec::IntoIter<(K, V)>,
}

into_par_vec!{
    HashMap<K, V, S> => IntoIter<K, V>,
    impl<K: Hash + Eq + Send, V: Send, S: BuildHasher>
}

delegate_iterator!{
    IntoIter<K, V> => (K, V),
    impl<K: Hash + Eq + Send, V: Send>
}


/// Parallel iterator over an immutable reference to a hash map
#[derive(Debug)]
pub struct Iter<'a, K: Hash + Eq + Sync + 'a, V: Sync + 'a> {
    inner: vec::IntoIter<(&'a K, &'a V)>,
}

impl<'a, K: Hash + Eq + Sync, V: Sync> Clone for Iter<'a, K, V> {
    fn clone(&self) -> Self {
        Iter { inner: self.inner.clone() }
    }
}

into_par_vec!{
    &'a HashMap<K, V, S> => Iter<'a, K, V>,
    impl<'a, K: Hash + Eq + Sync, V: Sync, S: BuildHasher>
}

delegate_iterator!{
    Iter<'a, K, V> => (&'a K, &'a V),
    impl<'a, K: Hash + Eq + Sync + 'a, V: Sync + 'a>
}


/// Parallel iterator over a mutable reference to a hash map
#[derive(Debug)]
pub struct IterMut<'a, K: Hash + Eq + Sync + 'a, V: Send + 'a> {
    inner: vec::IntoIter<(&'a K, &'a mut V)>,
}

into_par_vec!{
    &'a mut HashMap<K, V, S> => IterMut<'a, K, V>,
    impl<'a, K: Hash + Eq + Sync, V: Send, S: BuildHasher>
}

delegate_iterator!{
    IterMut<'a, K, V> => (&'a K, &'a mut V),
    impl<'a, K: Hash + Eq + Sync + 'a, V: Send + 'a>
}