Enum phile::sqir::Cardinality

pub enum Cardinality {
    ZeroOrOne,
    One,
    ZeroOrMore,
    OneOrMore,
}

The cardinality or multiplicity shows how many entities in the referred side may be related to each entity in the referring side.

Variants

ZeroOrOne

Optional relationship: an instance on this side may or may not correspond to an instance on the other side.

One

Required, unique relationship: exactly one instance on this side must correspond to an instance at the other side.

ZeroOrMore

Optional, multiple-valued relationship: any or no instances on this side may correspond to an instance on the other side.

OneOrMore

Required, multiple-valued relationship: at least one instance on this side must correspond to an instance on the other side.

Trait Implementations

impl Debug for Cardinality

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

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 Copy for Cardinality

impl PartialEq for Cardinality

fn eq(&self, __arg_0: &Cardinality) -> bool

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

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

This method tests for !=.

impl Eq for Cardinality

impl PartialOrd for Cardinality

fn partial_cmp(&self, __arg_0: &Cardinality) -> Option<Ordering>

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

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

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

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

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

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

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

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 Ord for Cardinality

fn cmp(&self, __arg_0: &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 Hash for Cardinality

fn hash<__H: Hasher>(&self, __arg_0: &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].

impl Display for Cardinality

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

Formats the value using the given formatter.