Enum Literal 

pub enum Literal {
    Atom(String),
    Neg(String),
}

A propositional literal: an atom or its negation.

Variants

Atom(String)

Positive atom.

Neg(String)

Negated atom.

Implementations

impl Literal

pub fn atom(name: impl Into<String>) -> Self

Construct a positive literal.

Panics (debug builds)

Panics if name starts with the reserved prefix __applicable_, which is used internally by crate::aspic::StructuredSystem::add_undercut_rule to encode undercut attacks. Use add_undercut_rule to target a defeasible rule rather than constructing the literal directly.

pub fn neg(name: impl Into<String>) -> Self

Construct a negated literal.

Panics (debug builds)

Panics if name starts with the reserved prefix __applicable_. See Self::atom for context.

pub fn contrary(&self) -> Literal

Return the contrary of this literal (negation).

pub fn is_contrary_of(&self, other: &Literal) -> bool

Check whether two literals are contraries of each other.

Trait Implementations

impl Clone for Literal

fn clone(&self) -> Literal

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Literal

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

Formats the value using the given formatter.

impl Display for Literal

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

Formats the value using the given formatter.

impl Hash for Literal

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 Literal

fn cmp(&self, other: &Literal) -> 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 Literal

fn eq(&self, other: &Literal) -> 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 Literal

fn partial_cmp(&self, other: &Literal) -> 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 Eq for Literal

impl StructuralPartialEq for Literal