Macro maybe_par_chunks_mut_enumerate 

macro_rules! maybe_par_chunks_mut_enumerate {
    ($slice:expr, $chunk_size:expr, $closure:expr) => { ... };
}

Macro for enumerated parallel/sequential chunks iteration.

Example

use crate::maybe_par_chunks_mut_enumerate;

maybe_par_chunks_mut_enumerate!(data, chunk_size, |(idx, chunk)| {
    // process chunk at index idx
});