Macro none_cell_arr 

macro_rules! none_cell_arr {
    ($t:ty; $n:expr) => { ... };
}

Creates an array of type [Cell<Option<T>>; N] and default-initializes it to Cell:new(None) for every element. Similar to none_arr, plus a Cell.

Macro Arguments

• $t - The type to wrap into an Cell<Option<T>>.
• $n - The number of elements for the array.

Example

When dealing with non-Copy/Clone types, arrays of type [Option<T>; N] cannot be created even though the default type None could be applied:

// This type does not implement Copy/Clone.
struct Complicated;

// Fails with "the trait `Copy` is not implemented for `Complicated`":
let arr: [Cell<Option<Complicated>>; 10] = [Cell::new(None); 10];

This crate simplifies array creation of these cases through the none_cell_arr macro:

let arr = none_cell_arr![Complicated; 10];

// The result is an array of Cell<Option<Complicated>>.
let arr: [Cell<Option<Complicated>>; 10] = arr;

assert_eq!(arr.len(), 10);
for item in arr.into_iter() {
    assert!(item.take().is_none());
}