Kleene logic within Rust's type system

Values are True, False and Unknown. Operations are Not, BitAnd and BitOr from std::ops. There is also the Ternary enum which represents the values at runtime and the ToTernary trait that adds the to_ternary() methods to our value types.

Examples:

Same and Not

use ternary::{True, False, Unknown, Same}; use std::ops::Not; type NotTrue = <<True as Not>::Output as Same<False>>::Output; type NotFalse = <<False as Not>::Output as Same<True>>::Output; type NotUnknown = <<Unknown as Not>::Output as Same<Unknown>>::Output;

Transforming Values to Runtime, BitAnd and BitOr

assert_eq!(Ternary::T, <True as BitOr<<Unknown as BitAnd<False>>::Output>>::Output::to_ternary());

To use it, add ternary = "0.1.0" to your dependencies.