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 as_deref(&self) -> Nullable<&<T as Deref>::Target>where
    T: Deref,

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.

pub fn cast<U>(self) -> Nullable<U>where
    T: Into<U>,

pub fn unwrap_or(self, default: T) -> T

pub fn unwrap_or_default(self) -> Twhere
    T: Default,

impl<'a, T> Nullable<&'a T>where
    T: Clone,

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

Clone the referenced inner value.

Trait Implementations

impl<T> Clone for Nullable<T>where
    T: Clone,

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T> Debug for Nullable<T>where
    T: Debug,

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

Formats the value using the given formatter.

impl<T> Display for Nullable<T>where
    T: Display,

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

Formats the value using the given formatter.

impl<T, V> DisplayWithContext<V> for Nullable<T>where
    T: DisplayWithContext<V>,

fn fmt_with(&self, vocabulary: &V, f: &mut Formatter<'_>) -> Result<(), Error>

impl<T> Hash for Nullable<T>where
    T: Hash,

fn hash<__H>(&self, state: &mut __H)where
    __H: Hasher,

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, M> IntoJsonMeta<M> for Nullable<T>where
    T: IntoJsonMeta<M>,

fn into_json_meta(self, meta: M) -> Meta<Value<M>, M>

impl<T> Ord for Nullable<T>where
    T: Ord,

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

This method returns an Ordering between self and other.

const fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

const fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

const fn clamp(self, min: Self, max: Self) -> Selfwhere
    Self: PartialOrd<Self>,

Restrict a value to a certain interval.

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

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

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

const fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T> PartialOrd<Nullable<T>> for Nullable<T>where
    T: PartialOrd<T>,

fn partial_cmp(&self, other: &Nullable<T>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

const fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

const fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

const fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

const 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<'a, M> PrecomputeSize for Nullable<ContainerRef<'a, M>>

fn pre_compute_size(
    &self,
    options: &Options,
    sizes: &mut Vec<Size, Global>
) -> Size

impl PrecomputeSize for Nullable<Direction>

fn pre_compute_size(
    &self,
    _options: &Options,
    _sizes: &mut Vec<Size, Global>
) -> Size

impl<'a> PrecomputeSize for Nullable<IdRef<'a>>

fn pre_compute_size(
    &self,
    options: &Options,
    sizes: &mut Vec<Size, Global>
) -> Size

impl<'a> PrecomputeSize for Nullable<IriRef<'a>>

fn pre_compute_size(
    &self,
    _options: &Options,
    _sizes: &mut Vec<Size, Global>
) -> Size

impl<'a> PrecomputeSize for Nullable<LenientLanguageTag<'a>>

fn pre_compute_size(
    &self,
    _options: &Options,
    _sizes: &mut Vec<Size, Global>
) -> Size

impl<'a, M, C> PrecomputeSize for Nullable<TermDefinitionRef<'a, M, C>>where
    M: Clone,
    C: AnyValue<M> + PrecomputeSize,

fn pre_compute_size(
    &self,
    options: &Options,
    sizes: &mut Vec<Size, Global>
) -> Size

impl<'a> PrecomputeSize for Nullable<TypeRef<'a>>

fn pre_compute_size(
    &self,
    options: &Options,
    sizes: &mut Vec<Size, Global>
) -> Size

impl<'a> PrecomputeSize for Nullable<VocabRef<'a>>

fn pre_compute_size(
    &self,
    options: &Options,
    sizes: &mut Vec<Size, Global>
) -> Size

impl PrecomputeSize for Nullable<bool>

fn pre_compute_size(
    &self,
    options: &Options,
    sizes: &mut Vec<Size, Global>
) -> Size

impl Print for Nullable<Direction>

fn fmt_with(
    &self,
    f: &mut Formatter<'_>,
    _options: &Options,
    _indent: usize
) -> Result<(), Error>

fn pretty_print(&self) -> Printed<'_, Self>

Print the value with Options::pretty options.

fn compact_print(&self) -> Printed<'_, Self>

Print the value with Options::compact options.

fn inline_print(&self) -> Printed<'_, Self>

Print the value with Options::inline options.

fn print_with(&self, options: Options) -> Printed<'_, Self>

Print the value with the given options.

impl<'a> Print for Nullable<IdRef<'a>>

fn fmt_with(
    &self,
    f: &mut Formatter<'_>,
    options: &Options,
    indent: usize
) -> Result<(), Error>

fn pretty_print(&self) -> Printed<'_, Self>

Print the value with Options::pretty options.

fn compact_print(&self) -> Printed<'_, Self>

Print the value with Options::compact options.

fn inline_print(&self) -> Printed<'_, Self>

Print the value with Options::inline options.

fn print_with(&self, options: Options) -> Printed<'_, Self>

Print the value with the given options.

impl<'a> Print for Nullable<IriRef<'a>>

fn fmt_with(
    &self,
    f: &mut Formatter<'_>,
    _options: &Options,
    _indent: usize
) -> Result<(), Error>

fn pretty_print(&self) -> Printed<'_, Self>

Print the value with Options::pretty options.

fn compact_print(&self) -> Printed<'_, Self>

Print the value with Options::compact options.

fn inline_print(&self) -> Printed<'_, Self>

Print the value with Options::inline options.

fn print_with(&self, options: Options) -> Printed<'_, Self>

Print the value with the given options.

impl<'a> Print for Nullable<LenientLanguageTag<'a>>

fn fmt_with(
    &self,
    f: &mut Formatter<'_>,
    _options: &Options,
    _indent: usize
) -> Result<(), Error>

fn pretty_print(&self) -> Printed<'_, Self>

Print the value with Options::pretty options.

fn compact_print(&self) -> Printed<'_, Self>

Print the value with Options::compact options.

fn inline_print(&self) -> Printed<'_, Self>

Print the value with Options::inline options.

fn print_with(&self, options: Options) -> Printed<'_, Self>

Print the value with the given options.

impl<'a> Print for Nullable<TypeRef<'a>>

fn fmt_with(
    &self,
    f: &mut Formatter<'_>,
    options: &Options,
    indent: usize
) -> Result<(), Error>

fn pretty_print(&self) -> Printed<'_, Self>

Print the value with Options::pretty options.

fn compact_print(&self) -> Printed<'_, Self>

Print the value with Options::compact options.

fn inline_print(&self) -> Printed<'_, Self>

Print the value with Options::inline options.

fn print_with(&self, options: Options) -> Printed<'_, Self>

Print the value with the given options.

impl<'a> Print for Nullable<VocabRef<'a>>

fn fmt_with(
    &self,
    f: &mut Formatter<'_>,
    options: &Options,
    indent: usize
) -> Result<(), Error>

fn pretty_print(&self) -> Printed<'_, Self>

Print the value with Options::pretty options.

fn compact_print(&self) -> Printed<'_, Self>

Print the value with Options::compact options.

fn inline_print(&self) -> Printed<'_, Self>

Print the value with Options::inline options.

fn print_with(&self, options: Options) -> Printed<'_, Self>

Print the value with the given options.

impl Print for Nullable<bool>

fn fmt_with(
    &self,
    f: &mut Formatter<'_>,
    options: &Options,
    indent: usize
) -> Result<(), Error>

fn pretty_print(&self) -> Printed<'_, Self>

Print the value with Options::pretty options.

fn compact_print(&self) -> Printed<'_, Self>

Print the value with Options::compact options.

fn inline_print(&self) -> Printed<'_, Self>

Print the value with Options::inline options.

fn print_with(&self, options: Options) -> Printed<'_, Self>

Print the value with the given options.

impl<'a, M> PrintWithSize for Nullable<ContainerRef<'a, M>>

fn fmt_with_size(
    &self,
    f: &mut Formatter<'_>,
    options: &Options,
    indent: usize,
    sizes: &[Size],
    index: &mut usize
) -> Result<(), Error>

impl<'a, M, C> PrintWithSize for Nullable<TermDefinitionRef<'a, M, C>>where
    M: Clone,
    C: AnyValue<M> + PrintWithSize,

fn fmt_with_size(
    &self,
    f: &mut Formatter<'_>,
    options: &Options,
    indent: usize,
    sizes: &[Size],
    index: &mut usize
) -> Result<(), Error>

impl<T> StrippedPartialEq<Nullable<T>> for Nullable<T>where
    T: StrippedPartialEq<T>,

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

impl<M, T> TryFromJson<M> for Nullable<T>where
    T: TryFromStrippedJson<M>,

type Error = InvalidContext

fn try_from_json(
    Meta<Value<M>, M>
) -> Result<Meta<Nullable<T>, M>, Meta<InvalidContext, M>>

impl<T> Copy for Nullable<T>where
    T: Copy,

impl<T> Eq for Nullable<T>where
    T: Eq,

impl<T> StructuralEq for Nullable<T>

impl<T> StructuralPartialEq for Nullable<T>