Name Description Size
lib.rs Procedural macros to derive numeric traits in Rust. ## Usage Add this to your `Cargo.toml`: ```toml [dependencies] num-traits = "0.2" num-derive = "0.3" ``` Then you can derive traits on your own types: ```rust #[macro_use] extern crate num_derive; #[derive(FromPrimitive, ToPrimitive)] enum Color { Red, Blue, Green, } # fn main() {} ``` ## Explicit import By default the `num_derive` procedural macros assume that the `num_traits` crate is a direct dependency. If `num_traits` is instead a transitive dependency, the `num_traits` helper attribute can be used to tell `num_derive` to use a specific identifier for its imports. ```rust #[macro_use] extern crate num_derive; // Lets pretend this is a transitive dependency from another crate // reexported as `some_other_ident`. extern crate num_traits as some_other_ident; #[derive(FromPrimitive, ToPrimitive)] #[num_traits = "some_other_ident"] enum Color { Red, Blue, Green, } # fn main() {} ``` 33761