| commit | c78794c420a894518130462df7fc4e9a95f006fc | [log] [tgz] |
|---|---|---|
| author | lujc <lujc@google.com> | Tue Oct 15 05:29:35 2024 +0000 |
| committer | lujc <lujc@google.com> | Tue Oct 22 03:18:40 2024 +0000 |
| tree | c60e3e738da0fe9a968f7195b3feb8c2698adf6b | |
| parent | f12f4a2600ba74915a0750d48746d73697caa707 [diff] |
Import 'enum-as-inner' crate Request Document: go/android-rust-importing-crates For CL Reviewers: go/android3p#cl-review For Build Team: go/ab-third-party-imports Bug: 368527390 Test: m enum-as-inner Change-Id: I0b227c7cc509782401bbba003a7348e7f37344af
A deriving proc-macro for generating functions to automatically give access to the inner members of enum.
The basic case is meant for single item enums, like:
use enum_as_inner::EnumAsInner; #[derive(Debug, EnumAsInner)] enum OneEnum { One(u32), }
where the inner item can be retrieved with the as_*()/as_*_mut() or with the into_*() functions:
let one = OneEnum::One(1); assert_eq!(*one.as_one().unwrap(), 1); assert_eq!(one.into_one().unwrap(), 1); let mut one = OneEnum::One(2); assert_eq!(*one.as_one().unwrap(), 1); assert_eq!(*one.as_one_mut().unwrap(), 1); assert_eq!(one.into_one().unwrap(), 1);
where the result is either a reference for inner items or a tuple containing the inner items.
This will return true if enum's variant matches the expected type
use enum_as_inner::EnumAsInner; #[derive(EnumAsInner)] enum UnitVariants { Zero, One, Two, } let unit = UnitVariants::Two; assert!(unit.is_two());
This will return a tuple of the inner types:
use enum_as_inner::EnumAsInner; #[derive(Debug, EnumAsInner)] enum ManyVariants { One(u32), Two(u32, i32), Three(bool, u32, i64), }
And can be accessed like:
let mut many = ManyVariants::Three(true, 1, 2); assert_eq!(many.as_three().unwrap(), (&true, &1_u32, &2_i64)); assert_eq!(many.as_three_mut().unwrap(), (&mut true, &mut 1_u32, &mut 2_i64)); assert_eq!(many.into_three().unwrap(), (true, 1_u32, 2_i64));
This will return a tuple of the inner types, like the unnamed option:
use enum_as_inner::EnumAsInner; #[derive(Debug, EnumAsInner)] enum ManyVariants { One{ one: u32 }, Two{ one: u32, two: i32 }, Three{ one: bool, two: u32, three: i64 }, }
And can be accessed like:
let mut many = ManyVariants::Three{ one: true, two: 1, three: 2 }; assert_eq!(many.as_three().unwrap(), (&true, &1_u32, &2_i64)); assert_eq!(many.as_three_mut().unwrap(), (&mut true, &mut 1_u32, &mut 2_i64)); assert_eq!(many.into_three().unwrap(), (true, 1_u32, 2_i64));