orx-parallel 4.0.0

Performant parallel computations with an expressive iterator API.
Documentation 
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use crate::infallible_use::fun::UFlatMap;
use crate::infallible_use::{XapUse, XapUseBin};
use crate::sizes::{Bin, Many};
use core::iter::FusedIterator;

pub struct UBinX<X: XapUse<Size = Bin>, G: UFlatMap<U = X::U, I = X::O>> {
    x: X,
    g: G,
}

impl<X: XapUse<Size = Bin>, G: UFlatMap<U = X::U, I = X::O>> Clone for UBinX<X, G> {
    fn clone(&self) -> Self {
        *self
    }
}

impl<X: XapUse<Size = Bin>, G: UFlatMap<U = X::U, I = X::O>> Copy for UBinX<X, G> {}

impl<X: XapUse<Size = Bin>, G: UFlatMap<U = X::U, I = X::O>> UBinX<X, G> {
    pub fn new(x: X, g: G) -> Self {
        Self { x, g }
    }
}

impl<X: XapUse<Size = Bin>, G: UFlatMap<U = X::U, I = X::O>> XapUse for UBinX<X, G> {
    type I = X::I;

    type O = <G::O as IntoIterator>::Item;

    type Size = Many;

    type Values = IterBinX<<G::O as IntoIterator>::IntoIter>;

    type U = X::U;

    fn xap_use(&self, u: *mut Self::U, i: Self::I) -> Self::Values {
        let i = self
            .x
            .bin_value(u, i)
            .map(|x| self.g.flat_map(unsafe { &mut *u }, x).into_iter());
        IterBinX { i }
    }
}

// iter

pub struct IterBinX<I: Iterator> {
    i: Option<I>,
}

impl<I: Iterator> Iterator for IterBinX<I> {
    type Item = I::Item;

    #[inline(always)]
    fn next(&mut self) -> Option<Self::Item> {
        self.i.as_mut().and_then(|x| x.next())
    }

    #[inline(always)]
    fn size_hint(&self) -> (usize, Option<usize>) {
        match &self.i {
            Some(i) => i.size_hint(),
            None => (0, Some(0)),
        }
    }

    #[inline(always)]
    fn fold<B, F>(self, init: B, f: F) -> B
    where
        Self: Sized,
        F: FnMut(B, Self::Item) -> B,
    {
        match self.i {
            Some(i) => i.fold(init, f),
            None => init,
        }
    }

    #[inline(always)]
    fn count(self) -> usize
    where
        Self: Sized,
    {
        match self.i {
            Some(i) => i.count(),
            None => 0,
        }
    }
}

impl<I: ExactSizeIterator> ExactSizeIterator for IterBinX<I> {
    #[inline(always)]
    fn len(&self) -> usize {
        match &self.i {
            Some(i) => i.len(),
            None => 0,
        }
    }
}

impl<I: FusedIterator> FusedIterator for IterBinX<I> {}

impl<I: DoubleEndedIterator> DoubleEndedIterator for IterBinX<I> {
    #[inline(always)]
    fn next_back(&mut self) -> Option<Self::Item> {
        self.i.as_mut().and_then(|x| x.next_back())
    }
}