14 stable releases
3.0.1 | Mar 31, 2023 |
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3.0.0 | Mar 28, 2023 |
2.1.1 | Jan 7, 2023 |
1.2.1 | Dec 28, 2022 |
#1548 in Procedural macros
Used in 5 crates
(4 directly)
8KB
149 lines
integral-enum
Procedural macro for easy integer-like enums definition
Usage
use integral_enum::integral_enum;
// Discriminant will be automatically determined based on the variants count (from u8 to u64).
#[integral_enum]
// After macro expansion repr will be added automatically
// #[repr(u8)]
pub enum Animal {
Cat,
Dog,
Human,
}
// But discriminant type can be defined manually.
#[integral_enum(u64)]
// Same here
// #[repr(u64)]
pub enum Person {
Nero,
// Explicit discriminants also supported
NotNero = 102400,
PossiblyNero, // = 102401
AlmostNero,
}
// integral_enum derives the following traits automatically: Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord.
// And additionally creates implementation for the TryFrom trait:
assert_eq!(Animal::try_from(0), Ok(Animal::Cat));
assert_eq!(Animal::try_from(1), Ok(Animal::Dog));
assert_eq!(Animal::try_from(2), Ok(Animal::Human));
assert_eq!(Person::try_from(0), Ok(Person::Nero));
assert_eq!(Person::try_from(102400), Ok(Person::NotNero));
assert_eq1(Person::try_from(102401), Ok(Person::PossiblyNero));
Dependencies
~0.4–0.8MB
~19K SLoC