Enum prost_types::field::Cardinality

#[repr(i32)]
pub enum Cardinality {
    Unknown,
    Optional,
    Required,
    Repeated,
}

Whether a field is optional, required, or repeated.

Variants

Unknown

For fields with unknown cardinality.

Optional

For optional fields.

Required

For required fields. Proto2 syntax only.

Repeated

For repeated fields.

Methods

impl Cardinality

pub fn is_valid(value: i32) -> bool

Returns true if value is a variant of Cardinality.

pub fn from_i32(value: i32) -> Option<Cardinality>

Converts an i32 to a Cardinality, or None if value is not a valid variant.

Trait Implementations

impl PartialOrd<Cardinality> for Cardinality

fn partial_cmp(&self, other: &Cardinality) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

#[must_use]

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

This method tests less than (for self and other) and is used by the < operator.

#[must_use]

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

#[must_use]

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

This method tests greater than (for self and other) and is used by the > operator.

#[must_use]

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Cardinality

impl PartialEq<Cardinality> for Cardinality

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

This method tests for self and other values to be equal, and is used by ==.

#[must_use]

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

This method tests for !=.

impl Default for Cardinality

fn default() -> Cardinality

Returns the "default value" for a type.

impl From<Cardinality> for i32

fn from(value: Cardinality) -> i32

Performs the conversion.

impl Clone for Cardinality

fn clone(&self) -> Cardinality

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Ord for Cardinality

fn cmp(&self, other: &Cardinality) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

impl Eq for Cardinality

impl Debug for Cardinality

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

Formats the value using the given formatter.

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, 

Feeds a slice of this type into the given [Hasher].