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use serde::{Deserialize, Deserializer, Serialize, Serializer}; use std::{iter, slice}; use super::{Consumer, DistributedIterator, IntoDistributedIterator, IterIter}; use crate::pool::ProcessSend; impl<T> IntoDistributedIterator for [T] where T: ProcessSend, { type Iter = Never; type Item = Never; fn into_dist_iter(self) -> Self::Iter where Self: Sized, { unreachable!() } } impl<'a, T: Clone> IntoDistributedIterator for &'a [T] where T: ProcessSend, { type Iter = IterIter<iter::Cloned<slice::Iter<'a, T>>>; type Item = T; fn into_dist_iter(self) -> Self::Iter where Self: Sized, { IterIter(self.iter().cloned()) } } pub struct Never(!); impl DistributedIterator for Never { type Item = Self; type Task = Self; fn size_hint(&self) -> (usize, Option<usize>) { unreachable!() } fn next_task(&mut self) -> Option<Self::Task> { unreachable!() } } impl Consumer for Never { type Item = Self; fn run(self, _: &mut impl FnMut(Self::Item) -> bool) -> bool { unreachable!() } } impl Serialize for Never { fn serialize<S>(&self, _serializer: S) -> Result<S::Ok, S::Error> where S: Serializer, { unreachable!() } } impl<'de> Deserialize<'de> for Never { fn deserialize<D>(_deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'de>, { unreachable!() } }