EnumTools is a Rust procedural macro for making enums easier to use. After adding to cargo.toml, add

#[macro_use(EnumTools)]
extern crate enum_tools;

and extra functionality can be added with

#[derive(EnumTools)]
enum MyEnum { /* ... */ }

For each variant A, the following method will be derived:

fn is_A(&self) -> bool {/* ... */} // Returns true if self is A

In addition to the above, if the variant has data (either a tuple or struct) with types T1, T2, ..., the following methods will be derived:

fn unwrap_A(self) -> (T1, T2, ...) { /* ... */ }
fn unwrap_A_ref(&self) -> (&T1, &T2, ...) { /* ... */ }
fn unwrap_A_mut(&mut self) -> (&mut T1, &mut T2, ...) { /* ... */ }

If the variable is the wrong variant, a panic will be generated.