3 releases
Uses old Rust 2015
0.1.2 | Mar 18, 2018 |
---|---|
0.1.1 | Mar 17, 2018 |
0.1.0 | Mar 16, 2018 |
#29 in #repr
5KB
69 lines
from-repr-enum-derive
A crate to derive from for an Enum with a repr defined
Currently a #[repr()]
is needed for the derive to work
Example:
#[macro_use]
extern crate from_repr_enum_derive;
#[repr(u8)]
#[derive(FromReprEnum,Debug,PartialEq)]
enum Foo {
X = 1,
Y = 2,
Unknown = 255,
}
fn main() {
let z = Foo::from(1);
assert_eq!(Foo::X, z);
}
The match block that is created needs a default enum variant. The crate has a default of Unknown
Custom default variant
You can define your own with another attribute #[ReprEnumDefault = ""]
#[repr(u8)]
#[derive(FromReprEnum, Debug, PartialEq)]
#[ReprEnumDefault = "NotFound"]
enum Bar {
X = 1,
Y = 2,
NotFound = 255,
}
fn main() {
let x = Bar::from(1);
assert_eq!(Bar::X, x);
let u = Bar::from(99);
assert_eq!(Bar::NotFound, u);
}
Notes
The match block generated tries to use the Enum name with a wildcard. If the variants aren't found by the compiler you might need to add use path::to::Enum::*
Dependencies
~2MB
~47K SLoC