Enum chalk_engine::DelayedLiteral

pub enum DelayedLiteral<C: Context> {
    CannotProve(()),
    Negative(TableIndex),
    Positive(TableIndex, C::CanonicalConstrainedSubst),
}

Variants

CannotProve(())

Something which can never be proven nor disproven. Inserted when truncation triggers; doesn't arise normally.

Negative(TableIndex)

We are blocked on a negative literal ~G, where G is the goal of the given table. Because negative goals must always be ground, we don't need any other information.

Positive(TableIndex, C::CanonicalConstrainedSubst)

We are blocked on a positive literal Li; we found a conditional answer (the CanonicalConstrainedSubst) within the given table, but we have to come back later and see whether that answer turns out to be true.

Trait Implementations

impl<C: Context> PartialEq for DelayedLiteral<C>

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl<C: Context> Eq for DelayedLiteral<C>

impl<C: Context> PartialOrd for DelayedLiteral<C>

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl<C: Context> Ord for DelayedLiteral<C>

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

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

impl<C: Context> Hash for DelayedLiteral<C>

fn hash<H: Hasher>(&self, hasher: &mut H)

Feeds this value into the given [Hasher].

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

Feeds a slice of this type into the given [Hasher].

impl<C: Clone + Context> Clone for DelayedLiteral<C> where
    C::CanonicalConstrainedSubst: Clone, 

fn clone(&self) -> DelayedLiteral<C>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<C: Debug + Context> Debug for DelayedLiteral<C> where
    C::CanonicalConstrainedSubst: Debug, 

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.