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arr_macro
cargo install arr_macro
am

arr_macro

Initialize arrays with ease!

by Josh Mcguigan

0.1.3 (see all)License:MIT OR Apache-2.0
cargo install arr_macro
Readme

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Array macro helps initialize arrays. It is useful when initializing large arrays (greater than 32 elements), or arrays of types which do not implement the copy or default traits.

Array macro is implemented in 100% safe Rust.

For further background on the motivation behind this crate, check out this blog post.

Usage

use arr_macro::arr;

fn main() {
    let x: [Option<String>; 3] = arr![None; 3];
    assert_eq!(
        [None, None, None],
        x
    );

    // works with all enum types (and impl copy is not required)
    #[allow(dead_code)]
    enum MyEnum {
        A,
        B
    }
    let _: [MyEnum; 33] = arr![MyEnum::A; 33];

    // Vec::new()
    let _: [Vec<String>; 33] = arr![Vec::new(); 33];

    // or your own struct type
    // and you can even use a counter to behave differently based on the array index
    #[derive(Debug)]
    struct MyStruct {
        member: u16,
    }
    impl MyStruct {
        fn new(member: u16) -> Self {
            MyStruct { member }
        }
    }
    let mut i = 0u16;
    let x: [MyStruct; 33] = arr![MyStruct::new({i += 1; i - 1}); 33];

    assert_eq!(0, x[0].member);
    assert_eq!(1, x[1].member);
    assert_eq!(2, x[2].member);
}

License

Licensed under either of

at your option.

Contribution

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

GitHub Stars

69

LAST COMMIT

3yrs ago

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1

CONTRIBUTORS

3

OPEN ISSUES

2

OPEN PRs

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VersionTagPublished
0.1.3
3yrs ago
0.1.2
3yrs ago
0.1.1
3yrs ago
0.1.0
4yrs ago
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