expect_macro_derive

This crate is used to generate a expected method for each variant of an enum.

Usage

this derive macro is used to generate a method for each variant of an enum.

he method will be named expect_{variant_name} and will return a Option. if it matches the pattern it will return Some with the fields of the variant. otherwise it will return None.

Attributes

#[panic]

if this attribute is present on a variant, the generated method will panic instead of returning None. Note: the enum need to implement Debug.

Example

use expect_macro::Expect;

#[derive(Debug, Expect)]
enum Foo {
   #[panic] Bar { a: i32, b: i32 },
    Baz(i32, i32),
    Qux,
}

fn main() {
   let bar = Foo::Bar { a: 1, b: 2 };
   let baz = Foo::Baz(1, 2);
   let qux = Foo::Qux;
   let (a, b) = bar.expect_bar(1, 2);
   let opt: Option<(i32, i32)> = baz.expect_baz(1, 2);
   assert_eq!(qux.expect_qux(), Some(()));
   assert_eq!(a, 1);
   assert_eq!(b, 2);
   assert_eq!(opt, Some((1, 2)));
}

License

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

Contribution

You can contribute to this project in many forms:

• Report bugs and make suggestions on Github
• Submit pull requests with new features or bug fixes
• Star this project on Github
• And more!