pub fn and(l: Option<bool>, r: Option<bool>) -> Option<bool> {
match (l, r) {
(Some(true), Some(true)) => Some(true),
(Some(false), _) => Some(false),
(_, Some(false)) => Some(false),
_ => None,
}
}
pub fn or(l: Option<bool>, r: Option<bool>) -> Option<bool> {
match (l, r) {
(Some(false), Some(false)) => Some(false),
(Some(true), _) => Some(true),
(_, Some(true)) => Some(true),
_ => None,
}
}
pub fn imp(l: Option<bool>, r: Option<bool>) -> Option<bool> {
match (l, r) {
(Some(true), Some(false)) => Some(false),
(Some(false), _) => Some(true),
(_, Some(true)) => Some(true),
_ => None,
}
}
pub fn iff(l: Option<bool>, r: Option<bool>) -> Option<bool> {
match (l, r) {
(Some(l), Some(r)) => Some(l == r),
_ => None,
}
}
pub fn xor(l: Option<bool>, r: Option<bool>) -> Option<bool> {
match (l, r) {
(Some(l), Some(r)) => Some(l ^ r),
_ => None,
}
}
pub fn and_not(l: Option<bool>, r: Option<bool>) -> Option<bool> {
match (l, r) {
(Some(false), _) => Some(false),
(_, Some(true)) => Some(false),
(Some(true), Some(false)) => Some(true),
_ => None,
}
}