Struct transit_model_relations::ManyToMany

pub struct ManyToMany<T, U> { /* fields omitted */ }

A many to many relation, i.e. a T can have multiple U, and vice versa.

Methods

impl<T, U> ManyToMany<T, U>

pub fn from_forward(forward: BTreeMap<Idx<T>, IdxSet<U>>) -> Self

Constructor from the forward relation.

pub fn from_relations_chain<R1, R2>(r1: &R1, r2: &R2) -> Self where
    R1: Relation<From = T>,
    R2: Relation<From = R1::To, To = U>, 

Constructor from 2 chained relations, i.e. from the relations A->B and B->C, constructs the relation A->C.

pub fn from_relations_sink<R1, R2>(r1: &R1, r2: &R2) -> Self where
    R1: Relation<From = T>,
    R2: Relation<From = U, To = R1::To>, 

Constructor from 2 relations with a common sink, i.e. from the relations A->B and C->B, constructs the relation A->C.

pub fn from_relations_source<R1, R2>(r1: &R1, r2: &R2) -> Self where
    R1: Relation<To = T>,
    R2: Relation<From = R1::From, To = U>, 

Constructor from 2 relations with a common source, i.e. from the relations B->A and B->C, constructs the relation A->C.

Trait Implementations

impl<T: Debug, U: Debug> Debug for ManyToMany<T, U>

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

Formats the value using the given formatter.

impl<T: Default, U: Default> Default for ManyToMany<T, U>

fn default() -> ManyToMany<T, U>

Returns the "default value" for a type.

impl<T, U> Relation for ManyToMany<T, U>

type From = T

The type of the source object

type To = U

The type of the targer object

fn get_from(&self) -> IdxSet<T>

Returns the complete set of the source objects.

fn get_to(&self) -> IdxSet<U>

Returns the complete set of the target objects.

fn get_corresponding_forward(&self, from: &IdxSet<T>) -> IdxSet<U>

For a given set of the source objects, returns the corresponding targets objects.

fn get_corresponding_backward(&self, from: &IdxSet<U>) -> IdxSet<T>

For a given set of the target objects, returns the corresponding source objects.