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use crate::iter::plumbing::*;
use crate::iter::Either::{Left, Right};
use crate::iter::*;
/// `Either<L, R>` is a parallel iterator if both `L` and `R` are parallel iterators.
impl<L, R> ParallelIterator for Either<L, R>
where
L: ParallelIterator,
R: ParallelIterator<Item = L::Item>,
{
type Item = L::Item;
fn drive_unindexed<C>(self, consumer: C) -> C::Result
where
C: UnindexedConsumer<Self::Item>,
{
match self {
Left(iter) => iter.drive_unindexed(consumer),
Right(iter) => iter.drive_unindexed(consumer),
}
}
fn opt_len(&self) -> Option<usize> {
self.as_ref().either(L::opt_len, R::opt_len)
}
}
impl<L, R> IndexedParallelIterator for Either<L, R>
where
L: IndexedParallelIterator,
R: IndexedParallelIterator<Item = L::Item>,
{
fn drive<C>(self, consumer: C) -> C::Result
where
C: Consumer<Self::Item>,
{
match self {
Left(iter) => iter.drive(consumer),
Right(iter) => iter.drive(consumer),
}
}
fn len(&self) -> usize {
self.as_ref().either(L::len, R::len)
}
fn with_producer<CB>(self, callback: CB) -> CB::Output
where
CB: ProducerCallback<Self::Item>,
{
match self {
Left(iter) => iter.with_producer(callback),
Right(iter) => iter.with_producer(callback),
}
}
}
/// `Either<L, R>` can be extended if both `L` and `R` are parallel extendable.
impl<L, R, T> ParallelExtend<T> for Either<L, R>
where
L: ParallelExtend<T>,
R: ParallelExtend<T>,
T: Send,
{
fn par_extend<I>(&mut self, par_iter: I)
where
I: IntoParallelIterator<Item = T>,
{
match self.as_mut() {
Left(collection) => collection.par_extend(par_iter),
Right(collection) => collection.par_extend(par_iter),
}
}
}