orx-parallel 4.0.0

Performant parallel computations with an expressive iterator API.
Documentation 
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use crate::option::tests::utils::inputs_opt;
use crate::parameters::IterationOrder;
use crate::*;
use alloc::vec::Vec;
use std::format;
use std::string::{String, ToString};

const N: usize = 157;

#[test]
fn many_x_find_ok() {
    let inputs = inputs_opt(N, None);
    let result = inputs
        .into_par()
        .into_optional()
        .flat_map(|x| {
            let a = x.parse::<u64>().unwrap();
            (0..5).map(move |i| (a + i).to_string())
        })
        .flat_map(|x| [format!("{x}!"), x])
        .first();
    assert_eq!(result, Some(Some(String::from("0!"))));
}

#[test]
fn many_x_find_any_ok() {
    let inputs = inputs_opt(N, None);
    let result = inputs
        .into_par()
        .into_optional()
        .flat_map(|x| {
            let a = x.parse::<u64>().unwrap();
            (0..5).map(move |i| (a + i).to_string())
        })
        .flat_map(|x| [format!("{x}!"), x])
        .iteration_order(IterationOrder::Arbitrary)
        .first();
    assert!(result.is_some());
}

#[test]
fn many_x_reduce_ok() {
    let inputs = inputs_opt(N, None);
    let result = inputs
        .into_par()
        .into_optional()
        .flat_map(|x| {
            let a = x.parse::<u64>().unwrap();
            (0..5).map(move |i| (a + i).to_string())
        })
        .flat_map(|x| [format!("{x}!"), x])
        .reduce(|a, b| match a < b {
            true => b,
            false => a,
        });
    assert_eq!(result, Some(Some(String::from("99!"))));
}

#[test]
fn many_x_reduce_err() {
    let inputs = inputs_opt(N, Some(42));
    let result = inputs
        .into_par()
        .into_optional()
        .flat_map(|x| {
            let a = x.parse::<u64>().unwrap();
            (0..5).map(move |i| (a + i).to_string())
        })
        .flat_map(|x| [format!("{x}!"), x])
        .reduce(|a, b| match a < b {
            true => b,
            false => a,
        });
    assert_eq!(result, None);
}

#[test]
fn many_x_fold_ok() {
    let inputs = inputs_opt(N, None);
    let expected = inputs
        .clone()
        .into_par()
        .into_optional()
        .flat_map(|x| {
            let a = x.parse::<u64>().unwrap();
            (0..5).map(move |i| (a + i).to_string())
        })
        .flat_map(|x| [format!("{x}!"), x])
        .collect::<std::vec::Vec<_>>()
        .unwrap();

    let mut expected_flat = String::new();
    expected.iter().for_each(|x| expected_flat.push_str(x));
    let mut expected: Vec<_> = expected_flat.chars().collect();
    expected.sort();

    let result = inputs
        .into_par()
        .into_optional()
        .flat_map(|x| {
            let a = x.parse::<u64>().unwrap();
            (0..5).map(move |i| (a + i).to_string())
        })
        .flat_map(|x| [format!("{x}!"), x])
        .num_threads(4)
        .fold(String::new, |s, x| s.push_str(&x));
    let result = result.unwrap();
    assert!(result.len() <= 4);
    let result = result
        .into_iter()
        .reduce(|mut a: String, b: String| {
            a.push_str(&b);
            a
        })
        .unwrap();
    let mut result: Vec<_> = result.chars().collect();
    result.sort();

    assert_eq!(&result, &expected);
}

#[test]
fn many_x_fold_err() {
    let inputs = inputs_opt(N, Some(42));
    let result = inputs
        .into_par()
        .into_optional()
        .flat_map(|x| {
            let a = x.parse::<u64>().unwrap();
            (0..5).map(move |i| (a + i).to_string())
        })
        .flat_map(|x| [format!("{x}!"), x])
        .num_threads(4)
        .fold(String::new, |s, x| s.push_str(&x));
    assert_eq!(result, None);
}

#[test]
fn many_x_collect_ok() {
    let result: Option<Vec<_>> = inputs_opt(N, None)
        .into_par()
        .into_optional()
        .flat_map(|x| {
            let a = x.parse::<u64>().unwrap();
            (0..5).map(move |i| (a + i).to_string())
        })
        .flat_map(|x| [format!("{x}!"), x])
        .collect();
    assert!(result.is_some());
}

#[test]
fn many_x_collect_err() {
    let result: Option<Vec<_>> = inputs_opt(N, Some(42))
        .into_par()
        .into_optional()
        .flat_map(|x| {
            let a = x.parse::<u64>().unwrap();
            (0..5).map(move |i| (a + i).to_string())
        })
        .flat_map(|x| [format!("{x}!"), x])
        .collect();
    assert!(result.is_none());
}