Struct generic_graph::adjacency_list::elements::DirectedEdge

pub struct DirectedEdge<K, W> where
    K: Hash + Eq + Clone,
    W: Add + Sub + Eq + Ord + Copy,  { /* fields omitted */ }

The DirectedEdge type is the implementation an implementation od the Edge trait that uses CompoundKey as type, as such it also indicates the direction of the edge which lead from the left vertex to the right one.

Methods

impl<K: Hash + Eq + Clone, W: Add + Sub + Eq + Ord + Copy> DirectedEdge<K, W>

pub fn new(left: K, right: K, weight: W) -> DirectedEdge<K, W>

Returns an instance of Directed edge with the specified weight and pair of vertex keys

Trait Implementations

impl<K: Clone, W: Clone> Clone for DirectedEdge<K, W> where
    K: Hash + Eq + Clone,
    W: Add + Sub + Eq + Ord + Copy, 

fn clone(&self) -> DirectedEdge<K, W>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<K: Debug, W: Debug> Debug for DirectedEdge<K, W> where
    K: Hash + Eq + Clone,
    W: Add + Sub + Eq + Ord + Copy, 

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

Formats the value using the given formatter.

impl<K: Hash + Eq + Clone, V, W: Add + Sub + Eq + Ord + Copy> DirectedGraph<SimpleVertex<K, V>, DirectedEdge<K, W>, K, V, W, CompoundKey<K>> for AdjacencyGraph<K, V, W>

AdjacencyGraph implement the DirectedGraph trait Specifying the vertex type (DirectedVertex), the edge type (Directed Edge), and the edge key type (CompoundKey). But the vertex key type, the vertex value type and the edge weight type remain generics.

fn adjacent(&self, from: &K, to: &K) -> bool

Check if an edge going from the first to the second vertex exists

fn neighbors(&self, from: &K) -> Vec<&K>

Returns a Vector containing the keys of the vertexes reached by edges leaving from the vertex identified by the passed key

fn leading_to(&self, to: &K) -> Vec<&K>

Returns a vector containing the keys of the Vertexes from which an edge leave to reach the vertex identified by the passed key

fn get_vertex(&self, key: &K) -> Option<&SimpleVertex<K, V>>

Returns a reference to the vertex identified by the passed key

fn get_mut_vertex(&mut self, key: &K) -> Option<&mut SimpleVertex<K, V>>

Returns a mutable reference to the vertex identified by the passed key

fn get_edge(&self, pair: (&K, &K)) -> Option<&DirectedEdge<K, W>>

Returns a reference to the edge identified by the passed pair of keys

fn get_mut_edge(&mut self, pair: (&K, &K)) -> Option<&mut DirectedEdge<K, W>>

Returns a mutable reference to the edge identified by the passed pair of keys

impl<K: Hash + Eq + Clone, W: Add + Sub + Eq + Ord + Copy> Edge<K, W, CompoundKey<K>> for DirectedEdge<K, W>

DirectedEdge implement the Edge trait Specifying the edge key type (CompoundKey). But the vertex key type and the edge weight type remain generics.

fn get_weight(&self) -> W

Returns a copy of the weight (the weight type is required to implement Copy)

fn set_weight(&mut self, weight: W)

change the value of weight

fn left(&self) -> &K

Returns a reference to the key of the left hand vertex

fn right(&self) -> &K

Returns a reference to the key of the right hand vertex

fn get_pair(&self) -> (&K, &K)

Returns a pair of reference to the vertex keys. Ordered from left to right

fn generate_key(pair: (&K, &K)) -> CompoundKey<K>

Returns a new instance of CompoundKey from a pair of reference to vertex keys

Example

use generic_graph::adjacency_list::elements::DirectedEdge;
use generic_graph::Edge;

let edge = DirectedEdge::new(1, 2, 3);
let key = DirectedEdge::<i32, i32>::generate_key(edge.get_pair());

assert_eq!(key, edge.key());

fn key(&self) -> CompoundKey<K>

Returns an new instance of CompoundKey generated from the pair of keys stored isn the edge

Example

use generic_graph::adjacency_list::elements::DirectedEdge;
use generic_graph::Edge;

let edge = DirectedEdge::new(1, 2, 3);
let key = DirectedEdge::<i32, i32>::generate_key(edge.get_pair());

assert_eq!(key, edge.key());

impl<K: Eq, W: Eq> Eq for DirectedEdge<K, W> where
    K: Hash + Eq + Clone,
    W: Add + Sub + Eq + Ord + Copy, 

impl<K: PartialEq, W: PartialEq> PartialEq<DirectedEdge<K, W>> for DirectedEdge<K, W> where
    K: Hash + Eq + Clone,
    W: Add + Sub + Eq + Ord + Copy, 

fn eq(&self, other: &DirectedEdge<K, W>) -> bool

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

fn ne(&self, other: &DirectedEdge<K, W>) -> bool

This method tests for !=.

impl<K, W> StructuralEq for DirectedEdge<K, W> where
    K: Hash + Eq + Clone,
    W: Add + Sub + Eq + Ord + Copy, 

impl<K, W> StructuralPartialEq for DirectedEdge<K, W> where
    K: Hash + Eq + Clone,
    W: Add + Sub + Eq + Ord + Copy, 

impl<K: Hash + Eq + Clone, V, W: Add + Sub + Eq + Ord + Copy> VariableEdges<SimpleVertex<K, V>, DirectedEdge<K, W>, K, V, W, CompoundKey<K>> for AdjacencyGraph<K, V, W>

AdjacencyGraph uses HashMaps to store edges, allowing fast insertion and removal of the latter

fn add_edge(
    &mut self,
    edge: DirectedEdge<K, W>
) -> Result<Option<DirectedEdge<K, W>>, EdgeSide>

The add_edge() method shall return Ok(None) if the element was not previously set. Otherwise the element shall be updated (but no the key) and the old element shall be returned as Ok(Some(old_element)). If one or both of the concerned vertexes are missing an error containing an enum specifying which side is missing (Err(EdgeSide))

Examples

use generic_graph::adjacency_list::AdjacencyGraph;
use generic_graph::{SimpleVertex, VariableVertexes, VariableEdges};
use generic_graph::adjacency_list::elements::DirectedEdge;
use generic_graph::EdgeSide::Right;
let mut graph = AdjacencyGraph::new();
graph.add_vertex(SimpleVertex::new(1, "a"));
graph.add_vertex(SimpleVertex::new(2, "b"));
graph.add_vertex(SimpleVertex::new(3, "c"));

assert_eq!(Ok(None), graph.add_edge(DirectedEdge::new(1, 2, 0)));
assert_eq!(Ok(None), graph.add_edge(DirectedEdge::new(2, 1, 0)));
assert_eq!(Ok(None), graph.add_edge(DirectedEdge::new(3, 2, 0)));
assert_eq!(
     Ok(Some(DirectedEdge::new(1, 2, 0))),
     graph.add_edge(DirectedEdge::new(1, 2, 3))
);
assert_eq!(Err(Right), graph.add_edge(DirectedEdge::new(1, 4, 0)));

fn remove_edge(&mut self, pair: (&K, &K)) -> Option<DirectedEdge<K, W>>

The remove_edge() method shall return None if the element was not found, or Some(element) if it was found and removed.

Examples

use generic_graph::adjacency_list::AdjacencyGraph;
use generic_graph::{SimpleVertex, VariableVertexes, VariableEdges};
use generic_graph::adjacency_list::elements::DirectedEdge;
use generic_graph::EdgeSide::Right;
let mut graph = AdjacencyGraph::new();
graph.add_vertex(SimpleVertex::new(1, "a"));
graph.add_vertex(SimpleVertex::new(2, "b"));

graph.add_edge(DirectedEdge::new(1, 2, 3));

assert_eq!(
        Some(DirectedEdge::new(1, 2, 3)),
        graph.remove_edge((&1, &2))
);
assert_eq!(None, graph.remove_edge((&1, &2)));

impl<K: Hash + Eq + Clone, V, W: Add + Sub + Eq + Ord + Copy> VariableVertexes<SimpleVertex<K, V>, DirectedEdge<K, W>, K, V, W, CompoundKey<K>> for AdjacencyGraph<K, V, W>

AdjacencyGraph uses HashMaps to store vertexes, allowing fast insertion and removal of the latter

fn add_vertex(
    &mut self,
    vertex: SimpleVertex<K, V>
) -> Option<SimpleVertex<K, V>>

This method adds (or, if present, updates maintaining its edges) a vertex and returns None ore Some(old_vertex)

Examples

use generic_graph::adjacency_list::AdjacencyGraph;
use generic_graph::{SimpleVertex, VariableVertexes};
let mut graph = AdjacencyGraph::<i32, &str, i32>::new();

assert_eq!(None, graph.add_vertex(SimpleVertex::new(1, "a")));
assert_eq!(None, graph.add_vertex(SimpleVertex::new(2, "b")));
assert_eq!(Some(SimpleVertex::new(1, "a")), graph.add_vertex(SimpleVertex::new(1, "c")))

fn remove_vertex(&mut self, key: K) -> Option<SimpleVertex<K, V>>

This method removes a vertex and its edges from the graph and returns None ore Some(old_vertex)

Examples

use generic_graph::adjacency_list::AdjacencyGraph;
use generic_graph::{SimpleVertex, VariableVertexes};
let mut graph = AdjacencyGraph::<i32, &str, i32>::new();
graph.add_vertex(SimpleVertex::new(1, "a"));
graph.add_vertex(SimpleVertex::new(2, "b"));

assert_eq!(None, graph.remove_vertex(0));
assert_eq!(Some(SimpleVertex::new(1, "a")), graph.remove_vertex(1));
assert_eq!(Some(SimpleVertex::new(2, "b")), graph.remove_vertex(2));
assert_eq!(None, graph.remove_vertex(1));