Enum Ternary 

pub enum Ternary {
    False,
    Unknown,
    True,
}

三值逻辑中的单个取值。

顺序即枚举顺序，Ord 的派生保证 False < Unknown < True， 方便用 min / max 表达格序的 AND / OR。

Variants

False

假（0）。

Unknown

未知（X）。

True

真（1）。

Implementations

impl Ternary

pub const FALSE: Self = Self::False

逻辑常量假。

pub const UNKNOWN: Self = Self::Unknown

逻辑常量未知。

pub const TRUE: Self = Self::True

逻辑常量真。

pub const ALL: [Self; 3]

三值的所有取值，按 False < Unknown < True 顺序。

pub const fn from_bool(value: bool) -> Self

bool -> Ternary：true -> True，false -> False（无分支 Select）。

pub const fn to_bool(self) -> Option<bool>

Ternary -> Option<bool>：Unknown 返回 None。

pub const fn is_binary(self) -> bool

是否为二值（非 Unknown）。

pub const fn as_f64(self) -> f64

数值形式：False -> 0，Unknown -> 0.5，True -> 1。

这是把 X 视为“0 与 1 之间的不确定值”时的自然映射， 也是 Łukasiewicz 强加法 / 强合取的定义基础。

pub const fn is_false(self) -> bool

是否精确等于假；X 返回 false。

这里不做任何折叠。若要把 X 当假/当真的二值化，请用 to_bool_strict / to_bool_loose。

pub const fn is_true(self) -> bool

是否精确等于真；X 返回 false。

若要把 X 当真的二值化，请用 to_bool_loose。

pub const fn is_unknown(self) -> bool

是否为未知值。

pub const fn is_known(self) -> bool

是否为确定值（0 或 1）。

pub const fn to_bool_strict(self) -> bool

经典二值化：把 X 折成假。

pub const fn to_bool_loose(self) -> bool

经典二值化：把 X 折成真。

pub fn parse_char(c: char) -> Option<Self>

解析单个字符：0/f/F → 假，1/t/T → 真，x/X/? → 未知。

pub const fn as_char(self) -> char

单字符表示：假为 0，未知为 X，真为 1。

pub const fn as_compact_char(self) -> char

单字符紧凑表示（用于真值表列头，未知记作小写 x）。

Trait Implementations

impl Clone for Ternary

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Ternary

impl Debug for Ternary

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Ternary

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Ternary

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

Formats the value using the given formatter.

impl Eq for Ternary

impl Hash for Ternary

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

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 Ord for Ternary

fn cmp(&self, other: &Self) -> 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.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for Ternary

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Ternary

fn partial_cmp(&self, other: &Self) -> 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 Ternary

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Ternary