Enum ThreeValued

pub enum ThreeValued {
    False,
    True,
    Unknown,
}

An extension of a Boolean to three-valued logic.

Variants

False

True

Unknown

Implementations

impl ThreeValued

pub fn is_unknown(&self) -> bool

Whether the value is unknown, i.e. neither false nor true.

pub fn is_known(&self) -> bool

Whether the value is known, i.e. false or true.

pub fn is_false(&self) -> bool

Whether the value is definitely false.

pub fn is_true(&self) -> bool

Whether the value is definitely true.

Trait Implementations

impl Clone for ThreeValued

fn clone(&self) -> ThreeValued

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ThreeValued

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ThreeValued

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for ThreeValued

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Not for ThreeValued

type Output = ThreeValued

The resulting type after applying the ! operator.

fn not(self) -> Self

Performs the unary ! operation.

impl PartialEq for ThreeValued

fn eq(&self, other: &ThreeValued) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for ThreeValued

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for ThreeValued

impl Eq for ThreeValued

impl StructuralPartialEq for ThreeValued