Enum 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) -> T

where T: Default,

impl<'a, T> Nullable<&'a T>

where T: Clone,

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

Clone the referenced inner value.

impl<T> Nullable<T>

pub fn optional<'de, D>( deserializer: D, ) -> Result<Option<Nullable<T>>, <D as Deserializer<'de>>::Error>

where T: Deserialize<'de>, D: Deserializer<'de>,

Trait Implementations

impl<T> Clone for Nullable<T>

where T: Clone,

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

Returns a duplicate of the value.

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<'de, T> Deserialize<'de> for Nullable<T>

where T: Deserialize<'de>,

fn deserialize<D>( deserializer: D, ) -> Result<Nullable<T>, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

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> From<Option<T>> for Nullable<T>

fn from(value: Option<T>) -> Nullable<T>

Converts to this type from the input type.

impl<T> From<T> for Nullable<T>

fn from(value: T) -> Nullable<T>

Converts to this type from the input type.

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, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<T> IntoJson for Nullable<T>

where T: IntoJson,

fn into_json(self) -> Value

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.

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<T> PartialEq for Nullable<T>

where T: PartialEq,

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

where T: PartialOrd,

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

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<'a> PrecomputeSize for Nullable<&'a Container>

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

impl<'a> PrecomputeSize for Nullable<&'a Id>

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

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

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

impl<'a> PrecomputeSize for Nullable<&'a LenientLangTagBuf>

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

impl<'a> PrecomputeSize for Nullable<&'a TermDefinition>

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

impl<'a> PrecomputeSize for Nullable<&'a Type>

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

impl<'a> PrecomputeSize for Nullable<&'a Vocab>

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

impl PrecomputeSize for Nullable<Direction>

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

impl PrecomputeSize for Nullable<IriRefBuf>

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

impl PrecomputeSize for Nullable<bool>

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

impl<'a> Print for Nullable<&'a Id>

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<&'a IriRef>

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<&'a LenientLangTagBuf>

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<&'a Type>

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<&'a Vocab>

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<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 Print for Nullable<IriRefBuf>

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> PrintWithSize for Nullable<&'a Container>

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

impl<'a> PrintWithSize for Nullable<&'a TermDefinition>

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

impl<T> Serialize for Nullable<T>

where T: Serialize,

fn serialize<S>( &self, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl<T> TryFromJson for Nullable<T>

where T: TryFromJson,

type Error = <T as TryFromJson>::Error

fn try_from_json( value: Value, ) -> Result<Nullable<T>, <Nullable<T> as TryFromJson>::Error>

impl<T> Copy for Nullable<T>

where T: Copy,

impl<T> Eq for Nullable<T>

where T: Eq,

impl<T> StructuralPartialEq for Nullable<T>