Struct serde_json::value::Number [−][src]
Represents a JSON number, whether integer or floating point.
Implementations
impl Number
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pub fn is_i64(&self) -> bool
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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());
pub fn is_u64(&self) -> bool
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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());
pub fn is_f64(&self) -> bool
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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());
pub fn as_i64(&self) -> Option<i64>
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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);
pub fn as_u64(&self) -> Option<u64>
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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);
pub fn as_f64(&self) -> Option<f64>
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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));
pub fn from_f64(f: f64) -> Option<Number>
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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
impl Clone for Number
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impl Debug for Number
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impl<'de> Deserialize<'de> for Number
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impl<'de> Deserializer<'de> for Number
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impl<'de, 'a> Deserializer<'de> for &'a Number
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impl Display for Number
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impl Eq for Number
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impl From<Number> for Value
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impl From<i16> for Number
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impl From<i32> for Number
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impl From<i64> for Number
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impl From<i8> for Number
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impl From<isize> for Number
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impl From<u16> for Number
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impl From<u32> for Number
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impl From<u64> for Number
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impl From<u8> for Number
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impl From<usize> for Number
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impl FromStr for Number
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impl PartialEq<Number> for Number
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impl Serialize for Number
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impl StructuralEq for Number
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impl StructuralPartialEq for Number
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Auto Trait Implementations
impl RefUnwindSafe for Number
impl Send for Number
impl Sync for Number
impl Unpin for Number
impl UnwindSafe for Number
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> DeserializeOwned for T where
T: for<'de> Deserialize<'de>,
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T: for<'de> Deserialize<'de>,
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
impl<T> ToString for T where
T: Display + ?Sized,
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T: Display + ?Sized,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,