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
6,155 downloads per month
Used in 21 crates
(3 directly)
8KB
85 lines
init_with
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;