Struct NullSetExpression 

pub struct NullSetExpression<H: HostTypes> { /* private fields */ }

Phase 2 (orphan-closure) — resolver-absent default impl of SetExpression<H>. Every accessor returns H::EMPTY_* sentinels (for scalar / host-typed returns) or a 'static-lifetime reference to a sibling Null*’s ABSENT const (for trait-typed returns). Downstream provides concrete impls; this stub closes the ontology-derived trait orphan.

Implementations

impl<H: HostTypes> NullSetExpression<H>

pub const ABSENT: NullSetExpression<H>

Absent-value sentinel. &Self::ABSENT gives every trait-typed accessor a 'static-lifetime reference target.

Trait Implementations

impl<H: Clone + HostTypes> Clone for NullSetExpression<H>

fn clone(&self) -> NullSetExpression<H>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<H: Debug + HostTypes> Debug for NullSetExpression<H>

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

Formats the value using the given formatter.

impl<H: HostTypes> Default for NullSetExpression<H>

fn default() -> Self

Returns the “default value” for a type.

impl<H: Hash + HostTypes> Hash for NullSetExpression<H>

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<H: PartialEq + HostTypes> PartialEq for NullSetExpression<H>

fn eq(&self, other: &NullSetExpression<H>) -> 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<H: Copy + HostTypes> Copy for NullSetExpression<H>

impl<H: Eq + HostTypes> Eq for NullSetExpression<H>

impl<H: HostTypes> SetExpression<H> for NullSetExpression<H>

impl<H: HostTypes> StructuralPartialEq for NullSetExpression<H>

impl<H: HostTypes> TermExpression<H> for NullSetExpression<H>