enum_primitive

This crate exports a macro enum_from_primitive! that wraps an enum declaration and automatically adds an implementation of num::FromPrimitive (reexported here), to allow conversion from primitive integers to the enum. It therefore provides an alternative to the built-in #[derive(FromPrimitive)], which requires the unstable std::num::FromPrimitive and is disabled in Rust 1.0.

Documentation

https://andersk.github.io/enumprimitive-rs/enumprimitive/

Usage

Add the following to your Cargo.toml file:

[dependencies] enum_primitive = "*"

Import the crate using #[macro_use] extern crate enum_primitive, and wrap your enum declaration inside the enum_from_primitive! macro.

Example

```rust

[macrouse] extern crate enumprimitive;

extern crate num; use num::FromPrimitive;

enumfromprimitive! {

[derive(Debug, PartialEq)]

enum FooBar { Foo = 17, Bar = 42, Baz, } }

fn main() { asserteq!(FooBar::fromi32(17), Some(FooBar::Foo)); asserteq!(FooBar::fromi32(42), Some(FooBar::Bar)); asserteq!(FooBar::fromi32(43), Some(FooBar::Baz)); asserteq!(FooBar::fromi32(91), None); } ```