Enum Trinary 

pub enum Trinary {
    True,
    False,
    Unknown,
}

三值查询结果。

Variants

True

False

Unknown

Trait Implementations

impl Clone for Trinary

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 Trinary

impl Debug for Trinary

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

Formats the value using the given formatter.

impl Eq for Trinary

impl From<bool> for Trinary

fn from(b: bool) -> Self

Converts to this type from the input type.

impl PartialEq for Trinary

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Trinary