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//! Check whether a digraph is oriented.
//!
//! An oriented digraph has no cycle of length 2.
//!
//! # Examples
//!
//! ```
//! use graaf::{
//! AdjacencyList,
//! Circuit,
//! IsOriented,
//! };
//!
//! assert!(!AdjacencyList::circuit(2).is_oriented());
//! assert!(AdjacencyList::circuit(3).is_oriented());
//! ```
use crate::{
Arcs,
HasArc,
};
/// Check whether a digraph is oriented.
pub trait IsOriented {
/// Check whether the digraph is oriented.
///
/// # Examples
///
/// ```
/// use graaf::{
/// AdjacencyList,
/// Circuit,
/// IsOriented,
/// };
///
/// assert!(!AdjacencyList::circuit(2).is_oriented());
/// assert!(AdjacencyList::circuit(3).is_oriented());
/// ```
#[must_use]
fn is_oriented(&self) -> bool;
}
impl<D> IsOriented for D
where
D: Arcs + HasArc,
{
fn is_oriented(&self) -> bool {
self.arcs().all(|(u, v)| !self.has_arc(v, u))
}
}
/// `IsOriented` tests
#[macro_export]
macro_rules! test_is_oriented {
($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 is_oriented_bang_jensen_196() {
assert!(!bang_jensen_196().is_oriented());
}
#[test]
fn is_oriented_bang_jensen_34() {
assert!(bang_jensen_34().is_oriented());
}
#[test]
fn is_oriented_bang_jensen_94() {
assert!(bang_jensen_94().is_oriented());
}
#[test]
fn is_oriented_kattis_builddeps() {
assert!(kattis_builddeps().is_oriented());
}
#[test]
fn is_oriented_kattis_cantinaofbabel_1() {
assert!(!kattis_cantinaofbabel_1().is_oriented());
}
#[test]
fn is_oriented_kattis_cantinaofbabel_2() {
assert!(!kattis_cantinaofbabel_2().is_oriented());
}
#[test]
fn is_oriented_kattis_escapewallmaria_1() {
assert!(!kattis_escapewallmaria_1().is_oriented());
}
#[test]
fn is_oriented_kattis_escapewallmaria_2() {
assert!(!kattis_escapewallmaria_2().is_oriented());
}
#[test]
fn is_oriented_kattis_escapewallmaria_3() {
assert!(!kattis_escapewallmaria_3().is_oriented());
}
};
}