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//! Iterate a digraph's sinks.
//!
//! A sink is a vertex without out-neighbors.
//!
//! # Examples
//!
//! ```
//! use graaf::{
//! AddArc,
//! AdjacencyList,
//! Empty,
//! Sinks,
//! };
//!
//! let mut digraph = AdjacencyList::empty(4);
//!
//! digraph.add_arc(0, 1);
//! digraph.add_arc(0, 2);
//! digraph.add_arc(1, 2);
//!
//! assert!(digraph.sinks().eq([2, 3]));
//! ```
use crate::{
Outdegree,
Vertices,
};
/// Digraph sinks
pub trait Sinks {
/// Iterate a digraph's sinks.
///
/// # Examples
///
/// ```
/// use graaf::{
/// AddArc,
/// AdjacencyList,
/// Empty,
/// Sinks,
/// };
///
/// let mut digraph = AdjacencyList::empty(4);
///
/// digraph.add_arc(0, 1);
/// digraph.add_arc(0, 2);
/// digraph.add_arc(1, 2);
///
/// assert!(digraph.sinks().eq([2, 3]));
/// ```
#[must_use]
fn sinks(&self) -> impl Iterator<Item = usize>;
}
impl<D> Sinks for D
where
D: Outdegree + Vertices,
{
fn sinks(&self) -> impl Iterator<Item = usize> {
self.vertices().filter(move |&u| self.is_sink(u))
}
}
/// `Sinks` tests
#[macro_export]
macro_rules! test_sinks {
($fixture:path) => {
use $fixture::{
bang_jensen_34,
bang_jensen_94,
bang_jensen_196,
kattis_builddeps,
kattis_cantinaofbabel_1,
kattis_cantinaofbabel_2,
kattis_escapewallmaria_1,
kattis_escapewallmaria_2,
kattis_escapewallmaria_3,
};
#[test]
fn sinks_bang_jensen_196() {
assert!(bang_jensen_196().sinks().eq([]));
}
#[test]
fn sinks_bang_jensen_34() {
assert!(bang_jensen_34().sinks().eq([3, 4]));
}
#[test]
fn sinks_bang_jensen_94() {
assert!(bang_jensen_94().sinks().eq([5, 6]));
}
#[test]
fn sinks_kattis_builddeps() {
assert!(kattis_builddeps().sinks().eq([1]));
}
#[test]
fn sinks_kattis_cantinaofbabel_1() {
assert!(kattis_cantinaofbabel_1().sinks().eq([]));
}
#[test]
fn sinks_kattis_cantinaofbabel_2() {
assert!(kattis_cantinaofbabel_2().sinks().eq([]));
}
#[test]
fn sinks_kattis_escapewallmaria_1() {
assert!(
kattis_escapewallmaria_1()
.sinks()
.eq([0, 1, 2, 3, 4, 7, 8, 10, 11, 12, 14, 15])
);
}
#[test]
fn sinks_kattis_escapewallmaria_2() {
assert!(
kattis_escapewallmaria_2()
.sinks()
.eq([0, 1, 2, 3, 4, 7, 8, 10, 11, 14, 15])
);
}
#[test]
fn sinks_kattis_escapewallmaria_3() {
assert!(
kattis_escapewallmaria_3()
.sinks()
.eq([0, 3, 4, 7, 8, 10, 11, 14, 15])
);
}
};
}