Macro const_enum

macro_rules! const_enum {
    {
        $( #[$enummeta:meta] )*
        enum $name:ident, $path:path, $prefix:ident {
        $(
            $( #[$meta:meta] )*
            $c:ident
        ),* $(,)?
    }} => { ... };
}

Turns FFI constants into an enum, freely convertible to and from u32. An extra variant Other(u32) exists to contain values not known to this num. The parameters are: Enum name, path to constants, constant prefix.

use const_enum::const_enum;
mod sys {
    pub const NAME_B: u32 = 1;
}
 
const_enum! {
// you can also use "this" as the path if the constants are in the same scope. It doesn't work in doctests, though, so I added the "mod sys".
    enum TestEnum, sys, NAME_ {
        B,
    }
}