Crate enum_primitive_derive

This crate provides a custom derive Primitive that helps people providing native Rust bindings to C code by allowing a C-like enum declaration to convert to its primitve values and back from them. You can selectively include num_traits::ToPrimitive and num_traits::FromPrimitive to get these features.

Example

#[macro_use]
extern crate enum_primitive_derive;
extern crate num_traits;

use num_traits::{FromPrimitive, ToPrimitive};

#[derive(Debug, Eq, PartialEq, Primitive)]
enum Foo {
    Bar = 32,
    Dead = 42,
    Beef = 50,
}

fn main() {
    assert_eq!(Foo::from_i32(32), Some(Foo::Bar));
    assert_eq!(Foo::from_i32(42), Some(Foo::Dead));
    assert_eq!(Foo::from_i64(50), Some(Foo::Beef));
    assert_eq!(Foo::from_isize(17), None);

    let bar = Foo::Bar;
    assert_eq!(bar.to_i32(), Some(32));

    let dead = Foo::Dead;
    assert_eq!(dead.to_isize(), Some(42));
}

Functions

primitive

Provides implementation of num_traits::ToPrimitive and num_traits::FromPrimitive