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# num-derive
[](https://crates.io/crates/num-derive)
[](https://docs.rs/num-derive)
[](https://rust-lang.github.io/rfcs/2495-min-rust-version.html)
[](https://github.com/rust-num/num-derive/actions)
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"
```
and this to your crate root:
```rust
#[macro_use]
extern crate num_derive;
```
Then you can derive traits on your own types:
```rust
#[derive(FromPrimitive, ToPrimitive)]
enum Color {
Red,
Blue,
Green,
}
```
## Optional features
- **`full-syntax`** — Enables `num-derive` to handle enum discriminants
represented by complex expressions. Usually can be avoided by
[utilizing constants], so only use this feature if namespace pollution is
undesired and [compile time doubling] is acceptable.
[utilizing constants]: https://github.com/rust-num/num-derive/pull/3#issuecomment-359044704
[compile time doubling]: https://github.com/rust-num/num-derive/pull/3#issuecomment-359172588
## Releases
Release notes are available in [RELEASES.md](RELEASES.md).
## Compatibility
The `num-derive` crate is tested for rustc 1.31 and greater.
## License
Licensed under either of
* [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
* [MIT license](http://opensource.org/licenses/MIT)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.
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