orx-parallel 4.0.0

Performant parallel computations with an expressive iterator API.
Documentation 
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use crate::infallible::XapEnumByInput;
use crate::infallible::fun::Map;
use crate::infallible::fun::MapEnum;
use crate::infallible::xap::Xap;
use crate::sizes::Many;
use core::iter::FusedIterator;

/// Many-valued xap followed by a map step.
pub struct ManyM<X: Xap<Size = Many>, G: Map<I = X::O>> {
    x: X,
    g: G,
}

impl<X: Xap<Size = Many>, G: Map<I = X::O>> Clone for ManyM<X, G> {
    fn clone(&self) -> Self {
        *self
    }
}

impl<X: Xap<Size = Many>, G: Map<I = X::O>> Copy for ManyM<X, G> {}

impl<X: Xap<Size = Many>, G: Map<I = X::O>> ManyM<X, G> {
    /// Creates a many-valued mapped xap.
    pub fn new(x: X, g: G) -> Self {
        Self { x, g }
    }
}

impl<X: XapEnumByInput<Size = Many>, G: Map<I = X::O>> XapEnumByInput for ManyM<X, G> {
    type Enumerated = ManyM<X::Enumerated, MapEnum<G>>;

    fn enumerate(self) -> Self::Enumerated {
        let g = MapEnum::new(self.g);
        let x = self.x.enumerate();
        ManyM::new(x, g)
    }
}

impl<X: Xap<Size = Many>, G: Map<I = X::O>> Xap for ManyM<X, G> {
    type I = X::I;

    type O = G::O;

    type Size = Many;

    type Values = IterManyM<<X::Values as IntoIterator>::IntoIter, G>;

    #[inline(always)]
    fn xap(&self, i: Self::I) -> Self::Values {
        let i = self.x.xap(i).into_iter();
        IterManyM { i, g: self.g }
    }
}

// iter

/// Iterator returned by a many-valued mapped xap.
pub struct IterManyM<I, G>
where
    I: Iterator,
    G: Map<I = I::Item>,
{
    i: I,
    g: G,
}

impl<I, G> Iterator for IterManyM<I, G>
where
    I: Iterator,
    G: Map<I = I::Item>,
{
    type Item = G::O;

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

    #[inline(always)]
    fn size_hint(&self) -> (usize, Option<usize>) {
        self.i.size_hint()
    }

    #[inline]
    fn fold<B, F>(self, init: B, f: F) -> B
    where
        Self: Sized,
        F: FnMut(B, Self::Item) -> B,
    {
        self.i.map(|x| self.g.map(x)).fold(init, f)
    }

    #[inline]
    fn count(self) -> usize
    where
        Self: Sized,
    {
        self.i.count()
    }
}

impl<I, G> ExactSizeIterator for IterManyM<I, G>
where
    I: ExactSizeIterator,
    G: Map<I = I::Item>,
{
    #[inline(always)]
    fn len(&self) -> usize {
        self.i.len()
    }
}

impl<I, G> FusedIterator for IterManyM<I, G>
where
    I: FusedIterator,
    G: Map<I = I::Item>,
{
}

impl<I, G> DoubleEndedIterator for IterManyM<I, G>
where
    I: DoubleEndedIterator,
    G: Map<I = I::Item>,
{
    fn next_back(&mut self) -> Option<Self::Item> {
        self.i.next_back().map(|x| self.g.map(x))
    }
}