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//! Add an arc to an arc-weighted digraph.
//!
//! # Examples
//!
//! ```
//! use graaf::{
//! AddArcWeighted,
//! AdjacencyListWeighted,
//! ArcsWeighted,
//! Empty,
//! };
//!
//! let mut digraph = AdjacencyListWeighted::<isize>::empty(3);
//!
//! digraph.add_arc_weighted(0, 1, 2);
//! digraph.add_arc_weighted(0, 2, 1);
//! digraph.add_arc_weighted(1, 2, -3);
//!
//! assert!(
//! digraph
//! .arcs_weighted()
//! .eq([(0, 1, &2), (0, 2, &1), (1, 2, &-3)])
//! );
//! ```
/// Add an arc to an arc-weighted digraph.
pub trait AddArcWeighted {
/// The weight of an arc.
type Weight;
/// Add an arc from to the digraph.
///
/// # Arguments
///
/// * `u`: The tail vertex.
/// * `v`: The head vertex.
/// * `w`: The arc's weight.
///
/// # Panics
///
/// * Should panic if `u` equals `v`.
/// * Should panic if `u` isn't in the digraph.
/// * Should panic if `v` isn't in the digraph.
///
/// # Examples
///
/// ```
/// use graaf::{
/// AddArcWeighted,
/// AdjacencyListWeighted,
/// ArcsWeighted,
/// Empty,
/// };
///
/// let mut digraph = AdjacencyListWeighted::<isize>::empty(3);
///
/// digraph.add_arc_weighted(0, 1, 2);
/// digraph.add_arc_weighted(0, 2, 1);
/// digraph.add_arc_weighted(1, 2, -3);
///
/// assert!(
/// digraph
/// .arcs_weighted()
/// .eq([(0, 1, &2), (0, 2, &1), (1, 2, &-3)])
/// );
/// ```
fn add_arc_weighted(&mut self, u: usize, v: usize, w: Self::Weight);
}
/// `AddArcWeighted` proptests
#[macro_export]
macro_rules! proptest_add_arc_weighted {
($type:ty) => {
use {
proptest::proptest,
$crate::{
Degree,
proptest_strategy::arc,
},
};
proptest! {
#[test]
fn add_arc_weighted_arc_weight(
(u, v) in arc(25_usize),
w in 1..25_usize
) {
let mut digraph = <$type>::empty(100);
digraph.add_arc_weighted(u, v, w);
for x in digraph.vertices() {
for y in digraph.vertices() {
assert_eq!(
digraph.arc_weight(x, y),
(x == u && y == v).then_some(&w)
);
}
}
}
#[test]
fn add_arc_weighted_degree(
(u, v) in arc(25_usize),
w in 1..25_usize
) {
let mut digraph = <$type>::empty(100);
digraph.add_arc_weighted(u, v, w);
for x in digraph.vertices() {
assert_eq!(
digraph.degree(x),
usize::from(x == u) + usize::from(x == v)
);
}
}
#[test]
fn add_arc_weighted_has_arc(
(u, v) in arc(25_usize),
w in 1..25_usize
) {
let mut digraph = <$type>::empty(100);
digraph.add_arc_weighted(u, v, w);
assert!(digraph.has_arc(u, v));
}
#[test]
fn add_arc_weighted_indegree(
(u, v) in arc(25_usize),
w in 1..25_usize
) {
let mut digraph = <$type>::empty(100);
digraph.add_arc_weighted(u, v, w);
for u in digraph.vertices() {
assert_eq!(digraph.indegree(u), usize::from(u == v));
}
}
#[test]
fn add_arc_weighted_outdegree(
(u, v) in arc(25_usize),
w in 1..25_usize
) {
let mut digraph = <$type>::empty(100);
digraph.add_arc_weighted(u, v, w);
for x in digraph.vertices() {
assert_eq!(digraph.outdegree(x), usize::from(x == u));
}
}
#[test]
fn add_arc_weighted_remove_arc(
(u, v) in arc(25_usize),
w in 1..25_usize
) {
let d = <$type>::empty(100);
let mut h = d.clone();
h.add_arc_weighted(u, v, w);
for x in d.vertices() {
for y in d.vertices() {
if x == u && y == v {
assert!(h.remove_arc(x, y));
} else {
assert!(!h.remove_arc(x, y));
}
}
}
assert_eq!(d, h);
}
}
};
}