Enum Cardinality 

#[repr(i32)]
pub enum Cardinality {
    CARDINALITY_UNKNOWN = 0,
    CARDINALITY_OPTIONAL = 1,
    CARDINALITY_REQUIRED = 2,
    CARDINALITY_REPEATED = 3,
}

Whether a field is optional, required, or repeated.

Variants

CARDINALITY_UNKNOWN = 0

For fields with unknown cardinality.

CARDINALITY_OPTIONAL = 1

For optional fields.

CARDINALITY_REQUIRED = 2

For required fields. Proto2 syntax only.

CARDINALITY_REPEATED = 3

For repeated fields.

Implementations

impl Cardinality

pub const Unknown: Self = Self::CARDINALITY_UNKNOWN

Idiomatic alias for Self::CARDINALITY_UNKNOWN; Debug prints the variant name.

pub const Optional: Self = Self::CARDINALITY_OPTIONAL

Idiomatic alias for Self::CARDINALITY_OPTIONAL; Debug prints the variant name.

pub const Required: Self = Self::CARDINALITY_REQUIRED

Idiomatic alias for Self::CARDINALITY_REQUIRED; Debug prints the variant name.

pub const Repeated: Self = Self::CARDINALITY_REPEATED

Idiomatic alias for Self::CARDINALITY_REPEATED; Debug prints the variant name.

Trait Implementations

impl<'arbitrary> Arbitrary<'arbitrary> for Cardinality

Available on crate feature arbitrary only.

fn arbitrary(u: &mut Unstructured<'arbitrary>) -> Result<Self>

Generate an arbitrary value of Self from the given unstructured data.

fn arbitrary_take_rest(u: Unstructured<'arbitrary>) -> Result<Self>

Generate an arbitrary value of Self from the entirety of the given unstructured data.

fn size_hint(depth: usize) -> (usize, Option<usize>)

Get a size hint for how many bytes out of an Unstructured this type needs to construct itself.

fn try_size_hint( depth: usize, ) -> Result<(usize, Option<usize>), MaxRecursionReached>

Get a size hint for how many bytes out of an Unstructured this type needs to construct itself.

impl Clone for Cardinality

fn clone(&self) -> Cardinality

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Cardinality

impl Debug for Cardinality

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

Formats the value using the given formatter.

impl Default for Cardinality

fn default() -> Self

Returns the “default value” for a type.

impl Enumeration for Cardinality

fn from_i32(value: i32) -> Option<Self>

Convert from an i32 wire value to the enum.

fn to_i32(&self) -> i32

Convert the enum to its i32 wire value.

fn proto_name(&self) -> &'static str

The name of this enum variant as it appears in the .proto file.

fn from_proto_name(name: &str) -> Option<Self>

Look up a variant by its protobuf name string.

fn values() -> &'static [Self]

All known variants of this enum, in proto declaration order.

impl Eq for Cardinality

impl Hash for Cardinality

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 Cardinality

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

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Cardinality