Struct Decimal 

pub struct Decimal {
    pub exponent: i32,
    pub mantissa: i64,
}

Represents a scaled decimal number.

Fields

exponent: i32

mantissa: i64

Implementations

impl Decimal

pub fn new(exponent: i32, mantissa: i64) -> Decimal

pub fn from_string(value: &str) -> Result<Decimal>

If the field is of type decimal, the value resulting from the conversion is normalized. The reason for this is that the exponent and mantissa must be predictable when operators are applied to them individually. A decimal value is normalized by adjusting the mantissa and exponent so that the integer remainder after dividing the mantissa by 10 is not zero: mant % 10 != 0. For example 100 would be normalized as 1 * 10^2. If the mantissa is zero, the normalized decimal has a zero mantissa and a zero exponent.

Errors

Returns error if string is incorrect format.

pub fn from_float(value: f64) -> Result<Decimal>

Creates decimal value from float.

Errors

Returns error if number is not finite.

pub fn to_string(&self) -> String

If the number is in fact an integer, it is converted as if was of integer type. Otherwise, the number is represented by an integer part and a decimal part separated by a decimal point (‘.’). Each part is a sequence of digits ‘0’ – ‘9’. There must be at least one digit on each side of the decimal point. If the number is negative it is preceded by a minus sign (‘-’). The integer part must not have any leading zeroes.

pub fn to_float(&self) -> f64

Trait Implementations

impl Clone for Decimal

fn clone(&self) -> Decimal

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Decimal

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

Formats the value using the given formatter.

impl Default for Decimal

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Decimal

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'de> Deserializer<'de> for &mut Decimal

type Error = Error

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

fn deserialize_any<V>(self, _visitor: V) -> Result<V::Value, Self::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.

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

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a bool value.

fn deserialize_i8<V>( self, visitor: V, ) -> Result<V::Value, <Self as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i8 value.

fn deserialize_i16<V>( self, visitor: V, ) -> Result<V::Value, <Self as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i16 value.

fn deserialize_u8<V>( self, visitor: V, ) -> Result<V::Value, <Self as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u8 value.

fn deserialize_u16<V>( self, visitor: V, ) -> Result<V::Value, <Self as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u16 value.

fn deserialize_u32<V>( self, visitor: V, ) -> Result<V::Value, <Self as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u32 value.

fn deserialize_u64<V>( self, visitor: V, ) -> Result<V::Value, <Self as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u64 value.

fn deserialize_f32<V>( self, visitor: V, ) -> Result<V::Value, <Self as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f32 value.

fn deserialize_f64<V>( self, visitor: V, ) -> Result<V::Value, <Self as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f64 value.

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

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a char value.

fn deserialize_str<V>( self, visitor: V, ) -> Result<V::Value, <Self as Deserializer<'de>>::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.

fn deserialize_string<V>( self, visitor: V, ) -> Result<V::Value, <Self as Deserializer<'de>>::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.

fn deserialize_bytes<V>( self, visitor: V, ) -> Result<V::Value, <Self as Deserializer<'de>>::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.

fn deserialize_byte_buf<V>( self, visitor: V, ) -> Result<V::Value, <Self as Deserializer<'de>>::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.

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

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an optional value.

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

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit value.

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

where V: Visitor<'de>,

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

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

where V: Visitor<'de>,

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

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

where V: Visitor<'de>,

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

fn deserialize_tuple<V>( self, len: usize, visitor: V, ) -> Result<V::Value, <Self as Deserializer<'de>>::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.

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

where V: Visitor<'de>,

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

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

where V: Visitor<'de>,

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

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

where V: Visitor<'de>,

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

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

where V: Visitor<'de>,

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

fn deserialize_identifier<V>( self, visitor: V, ) -> Result<V::Value, <Self as Deserializer<'de>>::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.

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

where V: Visitor<'de>,

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

fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Self::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i32 value.

fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Self::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i64 value.

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

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i128 value.

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

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an u128 value.

fn is_human_readable(&self) -> bool

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

impl Display for Decimal

Format the decimal as number with specific number of digits after the decimal point.

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

Formats the value using the given formatter.

impl From<Decimal> for f64

fn from(value: Decimal) -> Self

Converts to this type from the input type.

impl Hash for Decimal

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 PartialEq for Decimal

fn eq(&self, other: &Decimal) -> 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<'de> SeqAccess<'de> for Decimal

type Error = Error

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

fn next_element_seed<T>( &mut self, seed: T, ) -> Result<Option<T::Value>, Self::Error>

where T: DeserializeSeed<'de>,

This returns Ok(Some(value)) for the next value in the sequence, or Ok(None) if there are no more remaining items.

fn next_element<T>(&mut self) -> Result<Option<T>, Self::Error>

where T: Deserialize<'de>,

This returns Ok(Some(value)) for the next value in the sequence, or Ok(None) if there are no more remaining items.

fn size_hint(&self) -> Option<usize>

Returns the number of elements remaining in the sequence, if known.

impl Serialize for Decimal

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

where S: Serializer,

Serialize this value into the given Serde serializer.

impl SerializeMap for &mut Decimal

type Ok = ()

Must match the Ok type of our Serializer.

type Error = Error

Must match the Error type of our Serializer.

fn serialize_key<T>(&mut self, _key: &T) -> Result<(), Self::Error>

where T: ?Sized + Serialize,

Serialize a map key.

fn serialize_value<T>(&mut self, _value: &T) -> Result<(), Self::Error>

where T: ?Sized + Serialize,

Serialize a map value.

fn end(self) -> Result<Self::Ok, Self::Error>

Finish serializing a map.

fn serialize_entry<K, V>( &mut self, key: &K, value: &V, ) -> Result<(), Self::Error>

where K: Serialize + ?Sized, V: Serialize + ?Sized,

Serialize a map entry consisting of a key and a value.

impl SerializeSeq for &mut Decimal

type Ok = ()

Must match the Ok type of our Serializer.

type Error = Error

Must match the Error type of our Serializer.

fn serialize_element<T>(&mut self, _value: &T) -> Result<(), Self::Error>

where T: ?Sized + Serialize,

Serialize a sequence element.

fn end(self) -> Result<Self::Ok, Self::Error>

Finish serializing a sequence.

impl SerializeStruct for &mut Decimal

type Ok = ()

Must match the Ok type of our Serializer.

type Error = Error

Must match the Error type of our Serializer.

fn serialize_field<T>( &mut self, _key: &'static str, _value: &T, ) -> Result<(), Self::Error>

where T: ?Sized + Serialize,

Serialize a struct field.

fn end(self) -> Result<Self::Ok, Self::Error>

Finish serializing a struct.

fn skip_field(&mut self, key: &'static str) -> Result<(), Self::Error>

Indicate that a struct field has been skipped.

impl SerializeStructVariant for &mut Decimal

type Ok = ()

Must match the Ok type of our Serializer.

type Error = Error

Must match the Error type of our Serializer.

fn serialize_field<T>( &mut self, _key: &'static str, _value: &T, ) -> Result<(), Self::Error>

where T: ?Sized + Serialize,

Serialize a struct variant field.

fn end(self) -> Result<Self::Ok, Self::Error>

Finish serializing a struct variant.

fn skip_field(&mut self, key: &'static str) -> Result<(), Self::Error>

Indicate that a struct variant field has been skipped.

impl SerializeTuple for &mut Decimal

type Ok = ()

Must match the Ok type of our Serializer.

type Error = Error

Must match the Error type of our Serializer.

fn serialize_element<T>(&mut self, _value: &T) -> Result<(), Self::Error>

where T: ?Sized + Serialize,

Serialize a tuple element.

fn end(self) -> Result<Self::Ok, Self::Error>

Finish serializing a tuple.

impl SerializeTupleStruct for &mut Decimal

type Ok = ()

Must match the Ok type of our Serializer.

type Error = Error

Must match the Error type of our Serializer.

fn serialize_field<T>(&mut self, _value: &T) -> Result<(), Self::Error>

where T: ?Sized + Serialize,

Serialize a tuple struct field.

fn end(self) -> Result<Self::Ok, Self::Error>

Finish serializing a tuple struct.

impl SerializeTupleVariant for &mut Decimal

type Ok = ()

Must match the Ok type of our Serializer.

type Error = Error

Must match the Error type of our Serializer.

fn serialize_field<T>(&mut self, _value: &T) -> Result<(), Self::Error>

where T: ?Sized + Serialize,

Serialize a tuple variant field.

fn end(self) -> Result<Self::Ok, Self::Error>

Finish serializing a tuple variant.

impl Serializer for &mut Decimal

type Ok = ()

The output type produced by this Serializer during successful serialization. Most serializers that produce text or binary output should set Ok = () and serialize into an io::Write or buffer contained within the Serializer instance. Serializers that build in-memory data structures may be simplified by using Ok to propagate the data structure around.

type Error = Error

The error type when some error occurs during serialization.

type SerializeSeq = &mut Decimal

Type returned from serialize_seq for serializing the content of the sequence.

type SerializeTuple = &mut Decimal

Type returned from serialize_tuple for serializing the content of the tuple.

type SerializeTupleStruct = &mut Decimal

Type returned from serialize_tuple_struct for serializing the content of the tuple struct.

type SerializeTupleVariant = &mut Decimal

Type returned from serialize_tuple_variant for serializing the content of the tuple variant.

type SerializeMap = &mut Decimal

Type returned from serialize_map for serializing the content of the map.

type SerializeStruct = &mut Decimal

Type returned from serialize_struct for serializing the content of the struct.

type SerializeStructVariant = &mut Decimal

Type returned from serialize_struct_variant for serializing the content of the struct variant.

fn serialize_bool(self, _v: bool) -> Result<Self::Ok, Self::Error>

Serialize a bool value.

fn serialize_i8(self, _v: i8) -> Result<Self::Ok, Self::Error>

Serialize an i8 value.

fn serialize_i16(self, _v: i16) -> Result<Self::Ok, Self::Error>

Serialize an i16 value.

fn serialize_i32(self, v: i32) -> Result<Self::Ok, Self::Error>

Serialize an i32 value.

fn serialize_i64(self, v: i64) -> Result<Self::Ok, Self::Error>

Serialize an i64 value.

fn serialize_u8(self, _v: u8) -> Result<Self::Ok, Self::Error>

Serialize a u8 value.

fn serialize_u16(self, _v: u16) -> Result<Self::Ok, Self::Error>

Serialize a u16 value.

fn serialize_u32(self, _v: u32) -> Result<Self::Ok, Self::Error>

Serialize a u32 value.

fn serialize_u64(self, _v: u64) -> Result<Self::Ok, Self::Error>

Serialize a u64 value.

fn serialize_f32(self, _v: f32) -> Result<Self::Ok, Self::Error>

Serialize an f32 value.

fn serialize_f64(self, _v: f64) -> Result<Self::Ok, Self::Error>

Serialize an f64 value.

fn serialize_char(self, _v: char) -> Result<Self::Ok, Self::Error>

Serialize a character.

fn serialize_str(self, _v: &str) -> Result<Self::Ok, Self::Error>

Serialize a &str.

fn serialize_bytes(self, _v: &[u8]) -> Result<Self::Ok, Self::Error>

Serialize a chunk of raw byte data.

fn serialize_none(self) -> Result<Self::Ok, Self::Error>

Serialize a None value.

fn serialize_some<T>(self, _value: &T) -> Result<Self::Ok, Self::Error>

where T: ?Sized + Serialize,

Serialize a Some(T) value.

fn serialize_unit(self) -> Result<Self::Ok, Self::Error>

Serialize a () value.

fn serialize_unit_struct( self, _name: &'static str, ) -> Result<Self::Ok, Self::Error>

Serialize a unit struct like struct Unit or PhantomData<T>.

fn serialize_unit_variant( self, _name: &'static str, _variant_index: u32, _variant: &'static str, ) -> Result<Self::Ok, Self::Error>

Serialize a unit variant like E::A in enum E { A, B }.

fn serialize_newtype_struct<T>( self, _name: &'static str, _value: &T, ) -> Result<Self::Ok, Self::Error>

where T: ?Sized + Serialize,

Serialize a newtype struct like struct Millimeters(u8).

fn serialize_newtype_variant<T>( self, _name: &'static str, _variant_index: u32, _variant: &'static str, _value: &T, ) -> Result<Self::Ok, Self::Error>

where T: ?Sized + Serialize,

Serialize a newtype variant like E::N in enum E { N(u8) }.

fn serialize_seq( self, _len: Option<usize>, ) -> Result<Self::SerializeSeq, Self::Error>

Begin to serialize a variably sized sequence. This call must be followed by zero or more calls to serialize_element, then a call to end.

fn serialize_tuple( self, _len: usize, ) -> Result<Self::SerializeTuple, Self::Error>

Begin to serialize a statically sized sequence whose length will be known at deserialization time without looking at the serialized data. This call must be followed by zero or more calls to serialize_element, then a call to end.

fn serialize_tuple_struct( self, _name: &'static str, _len: usize, ) -> Result<Self::SerializeTupleStruct, Self::Error>

Begin to serialize a tuple struct like struct Rgb(u8, u8, u8). This call must be followed by zero or more calls to serialize_field, then a call to end.

fn serialize_tuple_variant( self, _name: &'static str, _variant_index: u32, _variant: &'static str, _len: usize, ) -> Result<Self::SerializeTupleVariant, Self::Error>

Begin to serialize a tuple variant like E::T in enum E { T(u8, u8) }. This call must be followed by zero or more calls to serialize_field, then a call to end.

fn serialize_map( self, _len: Option<usize>, ) -> Result<Self::SerializeMap, Self::Error>

Begin to serialize a map. This call must be followed by zero or more calls to serialize_key and serialize_value, then a call to end.

fn serialize_struct( self, _name: &'static str, _len: usize, ) -> Result<Self::SerializeStruct, Self::Error>

Begin to serialize a struct like struct Rgb { r: u8, g: u8, b: u8 }. This call must be followed by zero or more calls to serialize_field, then a call to end.

fn serialize_struct_variant( self, _name: &'static str, _variant_index: u32, _variant: &'static str, _len: usize, ) -> Result<Self::SerializeStructVariant, Self::Error>

Begin to serialize a struct variant like E::S in enum E { S { r: u8, g: u8, b: u8 } }. This call must be followed by zero or more calls to serialize_field, then a call to end.

fn serialize_i128(self, v: i128) -> Result<Self::Ok, Self::Error>

Serialize an i128 value.

fn serialize_u128(self, v: u128) -> Result<Self::Ok, Self::Error>

Serialize a u128 value.

fn collect_seq<I>(self, iter: I) -> Result<Self::Ok, Self::Error>

where I: IntoIterator, <I as IntoIterator>::Item: Serialize,

Collect an iterator as a sequence.

fn collect_map<K, V, I>(self, iter: I) -> Result<Self::Ok, Self::Error>

where K: Serialize, V: Serialize, I: IntoIterator<Item = (K, V)>,

Collect an iterator as a map.

fn collect_str<T>(self, value: &T) -> Result<Self::Ok, Self::Error>

where T: Display + ?Sized,

Serialize a string produced by an implementation of Display.

fn is_human_readable(&self) -> bool

Determine whether Serialize implementations should serialize in human-readable form.

impl TryFrom<f64> for Decimal

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: f64) -> Result<Self>

Performs the conversion.

impl Eq for Decimal

impl StructuralPartialEq for Decimal