Struct Null

pub struct Null;

Null JSON type.

This is a dummy type that can only represent the null JSON value.

Trait Implementations

impl Debug for Null

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

Formats the value using the given formatter.

impl Hash for Null

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 Json for Null

type Array = Vec<Null>

Array type.

type Key = String

Object key type.

type Object = BTreeMap<String, Null>

Object type.

type MetaData = ()

Metadata type attached to each value.

type Number = Zero

Literal number type.

type String = String

String type.

fn as_value_ref(&self) -> ValueRef<'_, Self>

Returns a reference to the actual JSON value (without the metadata).

fn as_value_mut(&mut self) -> ValueMut<'_, Self>

Returns a mutable reference to the actual JSON value (without the metadata).

fn into_parts(self) -> (Value<Self>, Self::MetaData)

Transforms this JSON value into a Value and MetaData.

fn metadata(&self) -> &Self::MetaData

Returns a reference to the metadata associated to the JSON value.

fn as_pair_mut(&mut self) -> (ValueMut<'_, Self>, &Self::MetaData)

Returns a pair containing a mutable reference to the JSON value and a reference to its metadata.

fn into_value(self) -> Value<Self>

Transforms this JSON value into a Value.

fn as_pair(&self) -> (ValueRef<'_, Self>, &Self::MetaData)

Returns a pair containing a reference to the JSON value and a reference to its metadata.

fn is_null(&self) -> bool

Returns true if the value is a Null. Returns false otherwise.

fn is_empty_array(&self) -> bool

Checks if the value is an empty array.

fn is_empty_object(&self) -> bool

Checks if the value is an empty object.

fn is_empty_array_or_object(&self) -> bool

Checks if the value is an empty array or empty object.

fn is_bool(&self) -> bool

Returns true if the value is a boolean. Returns false otherwise.

fn is_number(&self) -> bool

Returns true if the value is a number. Returns false otherwise.

fn is_string(&self) -> bool

Returns true if the value is a string. Returns false otherwise.

fn is_array(&self) -> bool

Returns true if the value is an array. Returns false otherwise.

fn is_object(&self) -> bool

Returns true if the value is an object. Returns false otherwise.

fn as_bool(&self) -> Option<bool>

If the value is a boolean, returns the associated bool. Returns None otherwise.

fn as_number(&self) -> Option<&Self::Number>

If the value is a number, returns a reference to it. Returns None otherwise.

fn as_u32(&self) -> Option<u32>

Returns this number as an u32 if it can be exactly represented as such.

fn as_u64(&self) -> Option<u64>

Returns this number as an u64 if it can be exactly represented as such.

fn as_i32(&self) -> Option<i32>

Returns this number as an i32 if it can be exactly represented as such.

fn as_i64(&self) -> Option<i64>

Returns this number as an i64 if it can be exactly represented as such.

fn as_f32(&self) -> Option<f32>

Returns this number as an f32 if it can be exactly represented as such.

fn as_f32_lossy(&self) -> Option<f32>

Returns this number as an f32 if it is a number, potentially losing precision in the process.

fn as_f64(&self) -> Option<f64>

Returns this number as an f64 if it can be exactly represented as such.

fn as_f64_lossy(&self) -> Option<f64>

Returns this number as an f64 if it is a number, potentially losing precision in the process.

fn as_str(&self) -> Option<&str>

If the value is a string, returns its associated str. Returns None otherwise.

fn as_array(&self) -> Option<&Self::Array>

If the value is an array, returns a reference to it. Returns None otherwise.

fn as_array_mut(&mut self) -> Option<&mut Self::Array>

If the value is an array, returns a mutable reference to it. Returns None otherwise.

fn as_object(&self) -> Option<&Self::Object>

If the value is an object, returns a reference to it. Returns None otherwise.

fn as_object_mut(&mut self) -> Option<&mut Self::Object>

If the value is an object, returns a mutable reference to it. Returns None otherwise.

impl Ord for Null

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

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

fn partial_cmp(&self, other: &Null) -> 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 Eq for Null

impl StructuralPartialEq for Null