About

Simple crate that provides a macro to retrieve the first option that returns a value, given a list of options

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)

at your option.

lib.rs:

This crate exports a macro to chain multiple options together to retrieve the first item that is Some, from left to right

Every item is lazily evaluated, but to make this possible there's a caveat when trying to pass closures: you have to call them in place when passing the item

Example

fn my_fn<T>() -> Option<T> { None }
fn main() {
    let opt = Some(3);
    let v = any_opt!((|| None)(), my_fn(), Some(13), Some(55), None, Some(42), opt).unwrap_or_default();

    assert_eq!(v, 13);
}