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.

pub fn from_bool(value: bool) -> ThreeValued

Trait Implementations

impl BitAnd for ThreeValued

type Output = ThreeValued

The resulting type after applying the & operator.

fn bitand(self, rhs: ThreeValued) -> <ThreeValued as BitAnd>::Output

Performs the & operation.

impl BitOr for ThreeValued

type Output = ThreeValued

The resulting type after applying the | operator.

fn bitor(self, rhs: ThreeValued) -> <ThreeValued as BitOr>::Output

Performs the | operation.

impl BitXor for ThreeValued

type Output = ThreeValued

The resulting type after applying the ^ operator.

fn bitxor(self, rhs: ThreeValued) -> <ThreeValued as BitXor>::Output

Performs the ^ operation.

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<(), Error>

Formats the value using the given formatter.

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

fn deserialize<__D>( __deserializer: __D, ) -> Result<ThreeValued, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for ThreeValued

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

Formats the value using the given formatter.

impl Hash for ThreeValued

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Not for ThreeValued

type Output = ThreeValued

The resulting type after applying the ! operator.

fn not(self) -> ThreeValued

Performs the unary ! operation.

impl Ord for ThreeValued

fn cmp(&self, other: &ThreeValued) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

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 PartialOrd for ThreeValued

fn partial_cmp(&self, other: &ThreeValued) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for ThreeValued

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for ThreeValued

impl Eq for ThreeValued

impl StructuralPartialEq for ThreeValued