Enum Nullness 

pub enum Nullness {
    NotNull,
    MaybeNull,
    RequiredNonnull,
    Nullable,
}

Nullness requirements and guarantees for pointers.

Variants

NotNull

Pointer is guaranteed non-null.

MaybeNull

Pointer may be null.

RequiredNonnull

Pointer must be non-null (precondition for caller).

Nullable

Pointer is explicitly allowed to be null.

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<'de> Deserialize<'de> for Nullness

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

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 Serialize for Nullness

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for Nullness

impl Eq for Nullness

impl StructuralPartialEq for Nullness