Struct Discriminant

pub struct Discriminant<'a> {
    pub value: &'a [u8],
}

Discriminant of an enum variant.

The Discriminant value can be constructed using the discriminant! macro.

Fields

value: &'a [u8]

The numeric value of the discriminant.

The value is stored in negabinary representation in little-endian order as a byte array. Unlike the two’s complement representation, negabinary has a unique representation for signed and unsigned numbers that is independent of the size of the value type (e.g. i16 vs u64).

Specifically,

• the (-2)^0th digit is stored in the least significant bit of value[0]
• the (-2)^7th digit is stored in the most significant bit of value[0]
• the (-2)^8th digit is stored in the least significant bit of value[1]
• for all i >= value.len(), value[i] is implicitly all-zero

Trait Implementations

impl<'a> Clone for Discriminant<'a>

fn clone(&self) -> Discriminant<'a>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Discriminant<'a>

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

Formats the value using the given formatter.

impl<'de: 'a, 'a> Deserialize<'de> for Discriminant<'a>

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'a> Hash for Discriminant<'a>

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<'a> Ord for Discriminant<'a>

fn cmp(&self, other: &Discriminant<'a>) -> 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<'a> PartialEq for Discriminant<'a>

fn eq(&self, other: &Discriminant<'a>) -> 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<'a> PartialOrd for Discriminant<'a>

fn partial_cmp(&self, other: &Discriminant<'a>) -> 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<'a> Serialize for Discriminant<'a>

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<'a> Copy for Discriminant<'a>

impl<'a> Eq for Discriminant<'a>

impl<'a> StructuralPartialEq for Discriminant<'a>