Expand Array Rust Macro

This crate provides a macro to convert a static array to a fixed-size array. Limited type conversion is supported. This is useful when you need to make available global constants in a dynamic library, for example.

Limitations

The library can only convert string-like types for now. This is what I needed for my project, but I'm more than happy to accept pull requests that add more types.

Available types:

• u8, from:
  • [u8]
  • [i8]
  • [byte char]
  • byte string
  • &str
  • c_char
  • c string
• char, from:
  • [char]
  • &str
• c_char, from:
  • [u8]
  • [i8]
  • [byte char]
  • byte string
  • &str
  • c_char
  • c string

Usage

use expand_array::arrr;

let var: [<target_type>; target_len] = arrr!([<target_type>; target_len], <array>);

Example

use expand_array::arrr;

let arr: [u8; 10] = arrr!([u8; 10], [1, 2, 3, 4, 5]);
assert_eq!(arr, [1, 2, 3, 4, 5, 0, 0, 0, 0, 0]);

let arr: [u8; 10] = arrr!([u8; 10], b"Hello");
assert_eq!(arr, [72, 101, 108, 108, 111, 0, 0, 0, 0, 0]);

let arr: [u8; 10] = arrr!([u8; 10], "Hello");
assert_eq!(arr, [72, 101, 108, 108, 111, 0, 0, 0, 0, 0]);

let arr: [char; 10] = arrr!([char; 10], ['H', 'e', 'l', 'l', 'o']);
assert_eq!(arr, ['H', 'e', 'l', 'l', 'o', '\0', '\0', '\0', '\0', '\0']);

let arr: [char; 10] = arrr!([char; 10], "Hello");
assert_eq!(arr, ['H', 'e', 'l', 'l', 'o', '\0', '\0', '\0', '\0', '\0']);

use ::std::ffi::c_char;

let arr: [c_char; 10] = arrr!([c_char; 10], [72i8, 101i8, 108i8, 108i8, 111i8]);
assert_eq!(arr, [72i8, 101i8, 108i8, 108i8, 111i8, 0i8, 0i8, 0i8, 0i8, 0i8]);

let arr: [c_char; 10] = arrr!([c_char; 10], c"Hello");
assert_eq!(arr, [72i8, 101i8, 108i8, 108i8, 111i8, 0i8, 0i8, 0i8, 0i8, 0i8]);

let arr: [c_char; 10] = arrr!([c_char; 10], [72u8, 101u8, 108u8, 108u8, 111u8]);
assert_eq!(arr, [72i8, 101i8, 108i8, 108i8, 111i8, 0i8, 0i8, 0i8, 0i8, 0i8]);

let arr: [c_char; 10] = arrr!([c_char; 10], [b'H', b'e', b'l', b'l', b'o']);
assert_eq!(arr, [72i8, 101i8, 108i8, 108i8, 111i8, 0i8, 0i8, 0i8, 0i8, 0i8]);

let arr: [c_char; 10] = arrr!([c_char; 10], b"Hello");
assert_eq!(arr, [72i8, 101i8, 108i8, 108i8, 111i8, 0i8, 0i8, 0i8, 0i8, 0i8]);

let arr: [c_char; 10] = arrr!([c_char; 10], "Hello");
assert_eq!(arr, [72i8, 101i8, 108i8, 108i8, 111i8, 0i8, 0i8, 0i8, 0i8, 0i8]);