Struct serde_json::Number

source ·
pub struct Number { /* private fields */ }
Expand description

Represents a JSON number, whether integer or floating point.

Implementations§

source§

impl Number

source

pub fn is_i64(&self) -> bool

Returns true if the Number is an integer between i64::MIN and i64::MAX.

For any Number on which is_i64 returns true, as_i64 is guaranteed to return the integer value.

let big = i64::max_value() as u64 + 10;
let v = json!({ "a": 64, "b": big, "c": 256.0 });

assert!(v["a"].is_i64());

// Greater than i64::MAX.
assert!(!v["b"].is_i64());

// Numbers with a decimal point are not considered integers.
assert!(!v["c"].is_i64());
source

pub fn is_u64(&self) -> bool

Returns true if the Number is an integer between zero and u64::MAX.

For any Number on which is_u64 returns true, as_u64 is guaranteed to return the integer value.

let v = json!({ "a": 64, "b": -64, "c": 256.0 });

assert!(v["a"].is_u64());

// Negative integer.
assert!(!v["b"].is_u64());

// Numbers with a decimal point are not considered integers.
assert!(!v["c"].is_u64());
source

pub fn is_f64(&self) -> bool

Returns true if the Number can be represented by f64.

For any Number on which is_f64 returns true, as_f64 is guaranteed to return the floating point value.

Currently this function returns true if and only if both is_i64 and is_u64 return false but this is not a guarantee in the future.

let v = json!({ "a": 256.0, "b": 64, "c": -64 });

assert!(v["a"].is_f64());

// Integers.
assert!(!v["b"].is_f64());
assert!(!v["c"].is_f64());
source

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

If the Number is an integer, represent it as i64 if possible. Returns None otherwise.

let big = i64::max_value() as u64 + 10;
let v = json!({ "a": 64, "b": big, "c": 256.0 });

assert_eq!(v["a"].as_i64(), Some(64));
assert_eq!(v["b"].as_i64(), None);
assert_eq!(v["c"].as_i64(), None);
source

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

If the Number is an integer, represent it as u64 if possible. Returns None otherwise.

let v = json!({ "a": 64, "b": -64, "c": 256.0 });

assert_eq!(v["a"].as_u64(), Some(64));
assert_eq!(v["b"].as_u64(), None);
assert_eq!(v["c"].as_u64(), None);
source

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

Represents the number as f64 if possible. Returns None otherwise.

let v = json!({ "a": 256.0, "b": 64, "c": -64 });

assert_eq!(v["a"].as_f64(), Some(256.0));
assert_eq!(v["b"].as_f64(), Some(64.0));
assert_eq!(v["c"].as_f64(), Some(-64.0));
source

pub fn from_f64(f: f64) -> Option<Number>

Converts a finite f64 to a Number. Infinite or NaN values are not JSON numbers.

assert!(Number::from_f64(256.0).is_some());

assert!(Number::from_f64(f64::NAN).is_none());

Trait Implementations§

source§

impl Clone for Number

source§

fn clone(&self) -> Number

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from source. Read more
source§

impl Debug for Number

source§

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

Formats the value using the given formatter. Read more
source§

impl<'de> Deserialize<'de> for Number

source§

fn deserialize<D>(deserializer: D) -> Result<Number, D::Error>where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
source§

impl<'de, 'a> Deserializer<'de> for &'a Number

§

type Error = Error

The error type that can be returned if some error occurs during deserialization.
source§

fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Require the Deserializer to figure out how to drive the visitor based on what data type is in the input. Read more
source§

fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i8 value.
source§

fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i16 value.
source§

fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i32 value.
source§

fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i64 value.
source§

fn deserialize_i128<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i128 value. Read more
source§

fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u8 value.
source§

fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u16 value.
source§

fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u32 value.
source§

fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u64 value.
source§

fn deserialize_u128<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an u128 value. Read more
source§

fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f32 value.
source§

fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f64 value.
source§

fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a bool value.
source§

fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a char value.
source§

fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and does not benefit from taking ownership of buffered data owned by the Deserializer. Read more
source§

fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and would benefit from taking ownership of buffered data owned by the Deserializer. Read more
source§

fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and does not benefit from taking ownership of buffered data owned by the Deserializer. Read more
source§

fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and would benefit from taking ownership of buffered data owned by the Deserializer. Read more
source§

fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an optional value. Read more
source§

fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit value.
source§

fn deserialize_unit_struct<V>( self, name: &'static str, visitor: V ) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit struct with a particular name.
source§

fn deserialize_newtype_struct<V>( self, name: &'static str, visitor: V ) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a newtype struct with a particular name.
source§

fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values.
source§

fn deserialize_tuple<V>( self, len: usize, visitor: V ) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values and knows how many values there are without looking at the serialized data.
source§

fn deserialize_tuple_struct<V>( self, name: &'static str, len: usize, visitor: V ) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a tuple struct with a particular name and number of fields.
source§

fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a map of key-value pairs.
source§

fn deserialize_struct<V>( self, name: &'static str, fields: &'static [&'static str], visitor: V ) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a struct with a particular name and fields.
source§

fn deserialize_enum<V>( self, name: &'static str, variants: &'static [&'static str], visitor: V ) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an enum value with a particular name and possible variants.
source§

fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting the name of a struct field or the discriminant of an enum variant.
source§

fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type needs to deserialize a value whose type doesn’t matter because it is ignored. Read more
source§

fn is_human_readable(&self) -> bool

Determine whether Deserialize implementations should expect to deserialize their human-readable form. Read more
source§

impl<'de> Deserializer<'de> for Number

§

type Error = Error

The error type that can be returned if some error occurs during deserialization.
source§

fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Require the Deserializer to figure out how to drive the visitor based on what data type is in the input. Read more
source§

fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i8 value.
source§

fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i16 value.
source§

fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i32 value.
source§

fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i64 value.
source§

fn deserialize_i128<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i128 value. Read more
source§

fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u8 value.
source§

fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u16 value.
source§

fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u32 value.
source§

fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u64 value.
source§

fn deserialize_u128<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an u128 value. Read more
source§

fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f32 value.
source§

fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value, Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f64 value.
source§

fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a bool value.
source§

fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a char value.
source§

fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and does not benefit from taking ownership of buffered data owned by the Deserializer. Read more
source§

fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and would benefit from taking ownership of buffered data owned by the Deserializer. Read more
source§

fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and does not benefit from taking ownership of buffered data owned by the Deserializer. Read more
source§

fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and would benefit from taking ownership of buffered data owned by the Deserializer. Read more
source§

fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an optional value. Read more
source§

fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit value.
source§

fn deserialize_unit_struct<V>( self, name: &'static str, visitor: V ) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit struct with a particular name.
source§

fn deserialize_newtype_struct<V>( self, name: &'static str, visitor: V ) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a newtype struct with a particular name.
source§

fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values.
source§

fn deserialize_tuple<V>( self, len: usize, visitor: V ) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values and knows how many values there are without looking at the serialized data.
source§

fn deserialize_tuple_struct<V>( self, name: &'static str, len: usize, visitor: V ) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a tuple struct with a particular name and number of fields.
source§

fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a map of key-value pairs.
source§

fn deserialize_struct<V>( self, name: &'static str, fields: &'static [&'static str], visitor: V ) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a struct with a particular name and fields.
source§

fn deserialize_enum<V>( self, name: &'static str, variants: &'static [&'static str], visitor: V ) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an enum value with a particular name and possible variants.
source§

fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting the name of a struct field or the discriminant of an enum variant.
source§

fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type needs to deserialize a value whose type doesn’t matter because it is ignored. Read more
source§

fn is_human_readable(&self) -> bool

Determine whether Deserialize implementations should expect to deserialize their human-readable form. Read more
source§

impl Display for Number

source§

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

Formats the value using the given formatter. Read more
source§

impl From<Number> for Value

source§

fn from(f: Number) -> Self

Convert Number to Value

Examples
use serde_json::{Number, Value};

let n = Number::from(7);
let x: Value = n.into();
source§

impl From<i16> for Number

source§

fn from(i: i16) -> Self

Converts to this type from the input type.
source§

impl From<i32> for Number

source§

fn from(i: i32) -> Self

Converts to this type from the input type.
source§

impl From<i64> for Number

source§

fn from(i: i64) -> Self

Converts to this type from the input type.
source§

impl From<i8> for Number

source§

fn from(i: i8) -> Self

Converts to this type from the input type.
source§

impl From<isize> for Number

source§

fn from(i: isize) -> Self

Converts to this type from the input type.
source§

impl From<u16> for Number

source§

fn from(u: u16) -> Self

Converts to this type from the input type.
source§

impl From<u32> for Number

source§

fn from(u: u32) -> Self

Converts to this type from the input type.
source§

impl From<u64> for Number

source§

fn from(u: u64) -> Self

Converts to this type from the input type.
source§

impl From<u8> for Number

source§

fn from(u: u8) -> Self

Converts to this type from the input type.
source§

impl From<usize> for Number

source§

fn from(u: usize) -> Self

Converts to this type from the input type.
source§

impl FromStr for Number

§

type Err = Error

The associated error which can be returned from parsing.
source§

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type. Read more
source§

impl Hash for Number

source§

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

Feeds this value into the given Hasher. Read more
1.3.0 · source§

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
source§

impl PartialEq<Number> for Number

source§

fn eq(&self, other: &Number) -> bool

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

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.
source§

impl Serialize for Number

source§

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

Serialize this value into the given Serde serializer. Read more
source§

impl Eq for Number

source§

impl StructuralEq for Number

source§

impl StructuralPartialEq for Number

Auto Trait Implementations§

Blanket Implementations§

source§

impl<T> Any for Twhere T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for Twhere T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for Twhere U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T> ToOwned for Twhere T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T> ToString for Twhere T: Display + ?Sized,

source§

default fn to_string(&self) -> String

Converts the given value to a String. Read more
source§

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
source§

impl<T> DeserializeOwned for Twhere T: for<'de> Deserialize<'de>,