orx-parallel 4.0.0

Performant parallel computations with an expressive iterator API.
Documentation 
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use crate::infallible::{Xap, XapBin, XapOne};
use crate::infallible_use::{XapUse, XapUseBin, XapUseOne};
use crate::sizes::{Bin, One, size_pair::SizePair, size_pairs::OneMany};

#[derive(Clone, Copy, Default)]
pub struct OneBin;

impl SizePair for OneBin {
    type S1 = One;

    type S2 = Bin;

    type ThenBin = OneBin;

    type ThenMany = OneMany;

    fn transformed_size_hint((_lb, ub): (usize, Option<usize>)) -> (usize, Option<usize>) {
        (0, ub)
    }

    // option

    type XapOptResult<M, X1, X2>
        = Option<Option<X2::O>>
    where
        X1: Xap<O = Option<M>, Size = Self::S1>,
        X2: Xap<I = M, Size = Self::S2>;

    #[inline(always)]
    fn xap_opt<M, X1, X2>(x1: X1, x2: X2, i: X1::I) -> Self::XapOptResult<M, X1, X2>
    where
        X1: Xap<O = Option<M>, Size = Self::S1>,
        X2: Xap<I = M, Size = Self::S2>,
    {
        match x1.one_value(i) {
            Some(a) => x2.bin_value(a).map(Some),
            None => Some(None),
        }
    }

    // result

    type XapResResult<M, E, X1, X2>
        = Option<Result<X2::O, E>>
    where
        X1: Xap<O = Result<M, E>, Size = Self::S1>,
        X2: Xap<I = M, Size = Self::S2>;

    #[inline(always)]
    fn xap_res<M, E, X1, X2>(x1: X1, x2: X2, i: X1::I) -> Self::XapResResult<M, E, X1, X2>
    where
        X1: Xap<O = Result<M, E>, Size = Self::S1>,
        X2: Xap<I = M, Size = Self::S2>,
    {
        match x1.one_value(i) {
            Ok(a) => x2.bin_value(a).map(Ok),
            Err(e) => Some(Err(e)),
        }
    }

    // use - option

    type XapUseOptResult<M, X1, X2>
        = Option<Option<X2::O>>
    where
        X1: XapUse<O = Option<M>, Size = Self::S1>,
        X2: XapUse<U = X1::U, I = M, Size = Self::S2>;

    #[inline(always)]
    fn xap_use_opt<M, X1, X2>(
        u: *mut X1::U,
        x1: X1,
        x2: X2,
        i: X1::I,
    ) -> Self::XapUseOptResult<M, X1, X2>
    where
        X1: XapUse<O = Option<M>, Size = Self::S1>,
        X2: XapUse<U = X1::U, I = M, Size = Self::S2>,
    {
        match x1.one_value(u, i) {
            Some(a) => x2.bin_value(u, a).map(Some),
            None => Some(None),
        }
    }

    // use - result

    type XapUseResResult<M, E, X1, X2>
        = Option<Result<X2::O, E>>
    where
        X1: XapUse<O = Result<M, E>, Size = Self::S1>,
        X2: XapUse<U = X1::U, I = M, Size = Self::S2>;

    #[inline(always)]
    fn xap_use_res<M, E, X1, X2>(
        u: *mut X1::U,
        x1: X1,
        x2: X2,
        i: X1::I,
    ) -> Self::XapUseResResult<M, E, X1, X2>
    where
        X1: XapUse<O = Result<M, E>, Size = Self::S1>,
        X2: XapUse<U = X1::U, I = M, Size = Self::S2>,
    {
        match x1.one_value(u, i) {
            Ok(a) => x2.bin_value(u, a).map(Ok),
            Err(e) => Some(Err(e)),
        }
    }
}