7 releases (4 stable)

Uses old Rust 2015

1.1.0 Aug 26, 2017
1.0.2 Jun 3, 2017
1.0.1 Jan 20, 2017
1.0.0 Dec 27, 2016
0.1.2 Dec 19, 2016

#2098 in Rust patterns

Download history 1120/week @ 2024-03-14 1293/week @ 2024-03-21 1331/week @ 2024-03-28 1963/week @ 2024-04-04 1327/week @ 2024-04-11 1491/week @ 2024-04-18 1300/week @ 2024-04-25 1086/week @ 2024-05-02 970/week @ 2024-05-09 1468/week @ 2024-05-16 1342/week @ 2024-05-23 1527/week @ 2024-05-30 1572/week @ 2024-06-06 1599/week @ 2024-06-13 1643/week @ 2024-06-20 1052/week @ 2024-06-27

6,155 downloads per month
Used in 21 crates (3 directly)

Unlicense

8KB
85 lines

init_with

Documentation

Have you wanted to be able to initialize a fixed array in Rust by calling a function to create each element? Now you can!

use init_with::InitWith;

let my_array = {
    let mut seed = Vec::new();
    let mut next_val = 0;

    <[Vec<u32>; 3]>::init_with(|| {
        seed.push(next_val);
        next_val += 1;
        seed.clone()
    })
};

assert_eq!(my_array, [vec![0], vec![0, 1], vec![0, 1, 2]]);

Alternatively, init_with_indices can be used to more easily create array entries based on their index:

use init_with::InitWith;

let squares = <[usize; 5]>::init_with_indices(|i| i*i);

assert_eq!(squares, [0,1,4,9,16]);

This crate lets you initialize the array elements in a functional manner while hiding the unsafe code that's needed to do so.

To import this crate, put the following into your Cargo.toml:

[dependencies]
init_with = "1.1.0"

...and the following in your crate root:

extern crate init_with;

No runtime deps