c_enum.rs

macro_rules! c_enum {
  (
    ($count:expr) ? $enum_repr:ty ; $current:ident , $($rest:tt)*
  ) => {
    pub const $current : $enum_repr = $count;
    c_enum!( ($count + 1) ? $enum_repr ; $($rest)*);
  };
  (
    ($count:expr) ? $enum_repr:ty ; $current:ident $($rest:tt)*
  ) => {
    pub const $current : $enum_repr = $count;
  };
  (
    $(#[$enum_attributes:meta])* $enum_name:ident , $enum_repr:ty ; $($capture:tt)*
  ) => {
    $(#[$enum_attributes:meta])* pub type $enum_name = $enum_repr;
    c_enum!( (0) ? $enum_repr ; $($capture)*);
  };
}

c_enum!(AssetState, usize; AssetState_Unloaded, AssetState_Queued, AssetState_Loaded, AssetState_Locked);

fn main() {
    for &state in [AssetState_Unloaded, AssetState_Queued, AssetState_Loaded, AssetState_Locked].iter() {
        println!("{}", state);
    }
}