Enum Nullness 

pub enum Nullness {
    AlwaysNull,
    NonNull,
    MaybeNull,
}

Variants

AlwaysNull

Proven null.

NonNull

Proven non-null.

MaybeNull

May or may not be null.

Implementations

impl Nullness

pub fn join(self, other: Nullness) -> Nullness

Trait Implementations

impl Clone for Nullness

fn clone(&self) -> Nullness

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Nullness

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

Formats the value using the given formatter.

impl Hash for Nullness

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 PartialEq for Nullness

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

impl Eq for Nullness

impl StructuralPartialEq for Nullness