Macro et 

macro_rules! et {
    ($variant:ty, $value:ty, |$variable:ident| $($tt:tt)*) => { ... };
}

Builds an EnumTable for $variant and $value inside a const block.

The closure body must be valid in a const context; passing a non-const expression is a compile error. For a runtime equivalent, use crate::EnumTable::from_fn, crate::EnumTable::try_from_fn, or crate::EnumTable::checked_from_fn instead.

Examples

use enum_table::{EnumTable, Enumerable, et};

#[derive(Enumerable, Copy, Clone)]
enum Test {
    A,
    B,
    C,
}

const TABLE: EnumTable<Test, &'static str, { Test::COUNT }> =
    et!(Test, &'static str, |t| match t {
        Test::A => "A",
        Test::B => "B",
        Test::C => "C",
    });

assert_eq!(TABLE.get(Test::A), &"A");
assert_eq!(TABLE.get(Test::B), &"B");
assert_eq!(TABLE.get(Test::C), &"C");