ai
array-init
cargo install array-init
ai

array-init

Safe wrapper for initializing arrays

by Manish Goregaokar

2.0.1 (see all)License:MIT OR Apache-2.0
cargo install array-init
Readme

array-init

Crates.io Docs

The array-init crate allows you to initialize arrays with an initializer closure that will be called once for each element until the array is filled.

This way you do not need to default-fill an array before running initializers. Rust currently only lets you either specify all initializers at once, individually ([a(), b(), c(), ...]), or specify one initializer for a Copy type ([a(); N]), which will be called once with the result copied over.

Care is taken not to leak memory shall the initialization fail.

Examples:

// Initialize an array of length 50 containing
// successive squares


let arr: [usize; 50] = array_init::array_init(|i| i * i);




// Initialize an array from an iterator
// producing an array of [1,2,3,4] repeated




let four = [1,2,3,4];
let mut iter = four.iter().copied().cycle();
let arr: [u32; 50] = array_init::from_iter(iter).unwrap();




// Closures can also mutate state. We guarantee that they will be called
// in order from lower to higher indices.




let mut last = 1u64;
let mut secondlast = 0;
let fibonacci: [u64; 50] = arrayinit::array_init(|| {
let this = last + secondlast;
secondlast = last;
last = this;
this
});

let mut last = 1u64; let mut secondlast = 0; let fibonacci: [u64; 50] = arrayinit::array_init(|| { let this = last + secondlast; secondlast = last; last = this; this });

Licensing

Licensed under either of Apache License, Version 2.0 or MIT license at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

GitHub Stars

61

LAST COMMIT

6d ago

MAINTAINERS

1

CONTRIBUTORS

16

OPEN ISSUES

4

OPEN PRs

0
VersionTagPublished
2.0.1
6d ago
2.0.0
1yr ago
1.0.0
2yrs ago
0.1.1
3yrs ago
No alternatives found
No tutorials found
Add a tutorial