Derive Macro ConstEnum 

#[derive(ConstEnum)]

This function defines the procedural derive macro ConstEnum. It can be used on any enum with a repr type, e.g. repr(u8).

When being used on an enum, this will automatically add the following implementations:

• From<repr_type> for <enum_type>: Convert repr type to enum, panic if invalid value
• From<enum_type> for <repr_type>: Convert enum to repr type

Example

#![feature(const_trait_impl)]

use const_enum::ConstEnum;

#[derive(Copy, Clone, Debug, Eq, PartialEq, ConstEnum)]
#[repr(u8)]
enum Test {
    A = 0b010,
    B = 0b100,
    C = 0b001
}

pub fn example() {
    println!("{:?}", Test::from(0b010 as u8));
    println!("{:?}", u8::from(Test::A));
}