[][src]Struct tera::Number

pub struct Number { /* fields omitted */ }

Represents a JSON number, whether integer or floating point.

Methods

impl Number[src]

pub fn is_i64(&self) -> bool[src]

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.

This code runs with edition 2018
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());

pub fn is_u64(&self) -> bool[src]

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.

This code runs with edition 2018
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());

pub fn is_f64(&self) -> bool[src]

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.

This code runs with edition 2018
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());

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

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

This code runs with edition 2018
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);

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

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

This code runs with edition 2018
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);

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

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

This code runs with edition 2018
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));

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

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

This code runs with edition 2018
assert!(Number::from_f64(256.0).is_some());

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

Trait Implementations

impl Serialize for Number[src]

impl From<i64> for Number[src]

impl From<i32> for Number[src]

impl From<u64> for Number[src]

impl From<u8> for Number[src]

impl From<ParserNumber> for Number[src]

impl From<i8> for Number[src]

impl From<usize> for Number[src]

impl From<isize> for Number[src]

impl From<i16> for Number[src]

impl From<u16> for Number[src]

impl From<u32> for Number[src]

impl PartialEq<Number> for Number[src]

impl FromStr for Number[src]

type Err = Error

The associated error which can be returned from parsing.

impl Display for Number[src]

impl<'de, 'a> Deserializer<'de> for &'a Number[src]

type Error = Error

The error type that can be returned if some error occurs during deserialization. Read more

fn is_human_readable(&self) -> bool[src]

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

impl<'de> Deserializer<'de> for Number[src]

type Error = Error

The error type that can be returned if some error occurs during deserialization. Read more

fn is_human_readable(&self) -> bool[src]

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

impl<'de> Deserialize<'de> for Number[src]

impl Debug for Number[src]

impl Clone for Number[src]

fn clone_from(&mut self, source: &Self)
1.0.0
[src]

Performs copy-assignment from source. Read more

Auto Trait Implementations

impl Send for Number

impl Sync for Number

Blanket Implementations

impl<T, U> Into for T where
    U: From<T>, 
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

impl<T> ToString for T where
    T: Display + ?Sized
[src]

impl<T> From for T[src]

impl<T, U> TryFrom for T where
    U: Into<T>, 
[src]

type Error = !

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized
[src]

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

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

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> BorrowMut for T where
    T: ?Sized
[src]

impl<T> DeserializeOwned for T where
    T: Deserialize<'de>, 
[src]