Enum TruthValue 

pub enum TruthValue {
    True,
    False,
    Undefined,
}

Three-valued truth value for WFS

Variants

True

False

Undefined

Implementations

impl TruthValue

pub fn is_defined(&self) -> bool

Check if this is a definite value (not undefined)

Trait Implementations

impl Clone for TruthValue

fn clone(&self) -> TruthValue

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TruthValue

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

Formats the value using the given formatter.

impl PartialEq for TruthValue

fn eq(&self, other: &TruthValue) -> 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 Copy for TruthValue

impl Eq for TruthValue

impl StructuralPartialEq for TruthValue