Enum Label 

pub enum Label {
    Optional,
    Required,
    Repeated,
}

FieldDescriptorProto.Label — a field’s cardinality.

Variants

Optional

proto2 optional (or proto3 singular).

Required

required (proto2 only).

Repeated

repeated -> maps to sequence<T>.

Trait Implementations

impl Clone for Label

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Label

impl Debug for Label

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

Formats the value using the given formatter.

impl Eq for Label

impl PartialEq for Label

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Label