msgpass 0.5.0

Thin wrapper to a Message Passing Interface (MPI)
Documentation 
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use msgpass::*;
use num_complex::{Complex32, Complex64};

fn factorial(num: usize) -> usize {
    (1..=num).product()
    // (2..=num).into_iter().fold(1, |acc, x| acc * x)
}

fn complex32_fact(num: usize) -> Complex32 {
    (2..=num).into_iter().fold(Complex32::new(1.0, 1.0), |acc, x| acc * Complex32::new(x as f32, x as f32))
}

fn complex64_fact(num: usize) -> Complex64 {
    (2..=num).into_iter().fold(Complex64::new(1.0, 1.0), |acc, x| acc * Complex64::new(x as f64, x as f64))
}

fn main() -> Result<(), StrError> {
    mpi_init()?;

    let mut comm = Communicator::new()?;
    let rank = comm.rank()?;
    let size = comm.size()?;

    const N: usize = 3;

    let mut x_i32 = vec![0_i32; N];
    let mut x_i64 = vec![0_i64; N];
    let mut x_u32 = vec![0_u32; N];
    let mut x_u64 = vec![0_u64; N];
    let mut x_usz = vec![0_usize; N];
    let mut x_f32 = vec![0_f32; N];
    let mut x_f64 = vec![0_f64; N];
    let mut x_c32 = vec![Complex32::new(0.0, 0.0); N];
    let mut x_c64 = vec![Complex64::new(0.0, 0.0); N];

    for i in 0..N {
        x_i32[i] = rank as i32 + 1;
        x_i64[i] = rank as i64 + 1;
        x_u32[i] = rank as u32 + 1;
        x_u64[i] = rank as u64 + 1;
        x_usz[i] = rank + 1;
        x_f32[i] = rank as f32 + 1.0;
        x_f64[i] = rank as f64 + 1.0;
        x_c32[i] = Complex32::new(rank as f32 + 1.0, rank as f32 + 1.0);
        x_c64[i] = Complex64::new(rank as f64 + 1.0, rank as f64 + 1.0);
    }

    let mut y_i32 = vec![0_i32; N];
    let mut y_i64 = vec![0_i64; N];
    let mut y_u32 = vec![0_u32; N];
    let mut y_u64 = vec![0_u64; N];
    let mut y_usz = vec![0_usize; N];
    let mut y_f32 = vec![0_f32; N];
    let mut y_f64 = vec![0_f64; N];
    let mut y_c32 = vec![Complex32::new(0.0, 0.0); N];
    let mut y_c64 = vec![Complex64::new(0.0, 0.0); N];

    comm.reduce_i32(0, &mut y_i32, &x_i32, MpiOpInt::Prod)?;
    comm.reduce_i64(0, &mut y_i64, &x_i64, MpiOpInt::Prod)?;
    comm.reduce_u32(0, &mut y_u32, &x_u32, MpiOpInt::Prod)?;
    comm.reduce_u64(0, &mut y_u64, &x_u64, MpiOpInt::Prod)?;
    comm.reduce_usize(0, &mut y_usz, &x_usz, MpiOpInt::Prod)?;
    comm.reduce_f32(0, &mut y_f32, &x_f32, MpiOpReal::Prod)?;
    comm.reduce_f64(0, &mut y_f64, &x_f64, MpiOpReal::Prod)?;
    comm.reduce_c32(0, &mut y_c32, &x_c32, MpiOpComplex::Prod)?;
    comm.reduce_c64(0, &mut y_c64, &x_c64, MpiOpComplex::Prod)?;

    if rank == 0 {
        let f = factorial(size);
        let f_c32 = complex32_fact(size);
        let f_c64 = complex64_fact(size);
        let mut correct_i32 = vec![0_i32; N];
        let mut correct_i64 = vec![0_i64; N];
        let mut correct_u32 = vec![0_u32; N];
        let mut correct_u64 = vec![0_u64; N];
        let mut correct_usz = vec![0_usize; N];
        let mut correct_f32 = vec![0_f32; N];
        let mut correct_f64 = vec![0_f64; N];
        let mut correct_c32 = vec![Complex32::new(0.0, 0.0); N];
        let mut correct_c64 = vec![Complex64::new(0.0, 0.0); N];
        for i in 0..N {
            correct_i32[i] = f as i32;
            correct_i64[i] = f as i64;
            correct_u32[i] = f as u32;
            correct_u64[i] = f as u64;
            correct_usz[i] = f;
            correct_f32[i] = f as f32;
            correct_f64[i] = f as f64;
            correct_c32[i] = f_c32;
            correct_c64[i] = f_c64;
        }
        assert_eq!(&y_i32, &correct_i32);
        assert_eq!(&y_i64, &correct_i64);
        assert_eq!(&y_u32, &correct_u32);
        assert_eq!(&y_u64, &correct_u64);
        assert_eq!(&y_usz, &correct_usz);
        assert_eq!(&y_f32, &correct_f32);
        assert_eq!(&y_f64, &correct_f64);
        assert_eq!(&y_c32, &correct_c32);
        assert_eq!(&y_c64, &correct_c64);
    } else {
        for i in 0..N {
            assert_eq!(y_i32[i], 0);
            assert_eq!(y_i64[i], 0);
            assert_eq!(y_u32[i], 0);
            assert_eq!(y_u64[i], 0);
            assert_eq!(y_usz[i], 0);
            assert_eq!(y_f32[i], 0.0);
            assert_eq!(y_f64[i], 0.0);
            assert_eq!(y_c32[i], Complex32::new(0.0, 0.0));
            assert_eq!(y_c64[i], Complex64::new(0.0, 0.0));
        }
    }

    mpi_finalize()?;

    if rank == 0 {
        println!("... success ...");
    }
    Ok(())
}