Enum json_ld::Nullable

pub enum Nullable<T> {
    Null,
    Some(T),
}

Value that can be null.

The Option type is used in this crate to indicate values that may or may not be defined. Sometimes however, value can be explicitly defined as null, hence the need for this type.

Variants

Null

Null value.

Some(T)

Some other value.

Implementations

impl<T> Nullable<T>

pub fn is_null(&self) -> bool

Checks if the value is null.

pub fn is_some(&self) -> bool

Checks if the value is not null.

pub fn unwrap(self) -> T

Unwraps a non-null value.

Panics if the value is null.

pub fn as_ref(&self) -> Nullable<&T>

Returns a nullabl reference to the inner value.

pub fn option(self) -> Option<T>

Transform into an Option value.

pub fn map<F, U>(self, f: F) -> Nullable<U> where
    F: FnOnce(T) -> U, 

Map the inner value using the given function.

impl<'a, T: Clone> Nullable<&'a T>

pub fn cloned(&self) -> Nullable<T>

Clone the referenced inner value.

Trait Implementations

impl<J: JsonClone, K: JsonFrom<J>, T: AsJson<J, K>> AsJson<J, K> for Nullable<T>

fn as_json_with(
    &self,
    meta: impl Clone + Fn(Option<&J::MetaData>) -> K::MetaData
) -> K

Converts this value into a K JSON value using the given meta function to convert J::MetaData into K::MetaData.

fn as_json(&self) -> K where
    K::MetaData: Default, 

Converts this value into a K JSON value.

impl<T: Clone> Clone for Nullable<T>

fn clone(&self) -> Nullable<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Nullable<T>

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

Formats the value using the given formatter.

impl<T: Hash> Hash for Nullable<T>

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, 

Feeds a slice of this type into the given Hasher.

impl<T: Ord> Ord for Nullable<T>

fn cmp(&self, other: &Nullable<T>) -> 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.

fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl<T: PartialEq> PartialEq<Nullable<T>> for Nullable<T>

fn eq(&self, other: &Nullable<T>) -> bool

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

fn ne(&self, other: &Nullable<T>) -> bool

This method tests for !=.

impl<T: PartialEq> PartialEq<T> for Nullable<T>

fn eq(&self, other: &T) -> 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<T: PartialOrd> PartialOrd<Nullable<T>> for Nullable<T>

fn partial_cmp(&self, other: &Nullable<T>) -> 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<T: Copy> Copy for Nullable<T>

impl<T: Eq> Eq for Nullable<T>

impl<T> StructuralEq for Nullable<T>

impl<T> StructuralPartialEq for Nullable<T>