surjective-enum

Rust macro to derive a surjective mapping from enum representation to enum.

Derive a surjective ::core::convert::From conversion function which maps all values which are not part of the enumeration to the last enum discriminant.

The example

use surjective_enum::From;
#[repr(u8)]
#[derive(From)]
pub enum Enum {
	Bar  = 0b00,
	Foo  = 0b01,
	Rest = 0b11
}

will create a from(u8) -> Enum conversion function which maps 0 -> Bar, 1 -> Foo and all other values to Rest.