Enum SummaryNullness 

pub enum SummaryNullness {
    NonNull,
    MaybeNull,
    AlwaysNull,
}

Nullness classification for a pointer value.

Variants

NonNull

Guaranteed non-null.

MaybeNull

May be null.

AlwaysNull

Always null.

Implementations

impl SummaryNullness

pub fn from_spec_nullness(n: &Nullness) -> Self

Convert from the spec system’s Nullness to SummaryNullness.

The spec system has four variants (NotNull, MaybeNull, RequiredNonnull, Nullable). For summary purposes, NotNull and RequiredNonnull both map to NonNull, and Nullable maps to MaybeNull.

pub fn to_spec_nullness(self) -> Nullness

Convert to the spec system’s Nullness.

This is lossy: AlwaysNull has no direct spec equivalent and maps to MaybeNull (the conservative choice).

Trait Implementations

impl Clone for SummaryNullness

fn clone(&self) -> SummaryNullness

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SummaryNullness

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SummaryNullness

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for SummaryNullness

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 SummaryNullness

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

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

fn partial_cmp(&self, other: &SummaryNullness) -> 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 Serialize for SummaryNullness

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 SummaryNullness

impl Eq for SummaryNullness

impl StructuralPartialEq for SummaryNullness