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//! Iterate a vertex's weighted out-neighbours.
//!
//! # Examples
//!
//! ```
//! use graaf::{
//! AddArcWeighted,
//! AdjacencyListWeighted,
//! Empty,
//! OutNeighborsWeighted,
//! };
//!
//! let mut digraph = AdjacencyListWeighted::empty(6);
//!
//! digraph.add_arc_weighted(0, 1, 2);
//! digraph.add_arc_weighted(0, 2, 3);
//! digraph.add_arc_weighted(0, 3, 4);
//! digraph.add_arc_weighted(1, 2, 3);
//! digraph.add_arc_weighted(1, 3, 4);
//! digraph.add_arc_weighted(1, 4, 5);
//! digraph.add_arc_weighted(2, 3, 4);
//! digraph.add_arc_weighted(2, 4, 5);
//! digraph.add_arc_weighted(2, 5, 6);
//!
//! assert!(
//! digraph
//! .out_neighbors_weighted(0)
//! .eq([(1, &2), (2, &3), (3, &4)])
//! );
//!
//! assert!(
//! digraph
//! .out_neighbors_weighted(1)
//! .eq([(2, &3), (3, &4), (4, &5)])
//! );
//!
//! assert!(
//! digraph
//! .out_neighbors_weighted(2)
//! .eq([(3, &4), (4, &5), (5, &6)])
//! );
//! ```
#![doc(alias = "weighted_out_neighbours")]
/// Vertex weighted out-neighbours
#[doc(alias = "OutNeighboursWeighted")]
pub trait OutNeighborsWeighted {
/// The weight of an arc.
type Weight;
/// Iterate the vertex's weighted out-neighbors.
///
/// # Arguments
///
/// * `u`: The vertex.
///
/// # Examples
///
/// ```
/// use graaf::{
/// AddArcWeighted,
/// AdjacencyListWeighted,
/// Empty,
/// OutNeighborsWeighted,
/// };
///
/// let mut digraph = AdjacencyListWeighted::empty(6);
///
/// digraph.add_arc_weighted(0, 1, 2);
/// digraph.add_arc_weighted(0, 2, 3);
/// digraph.add_arc_weighted(0, 3, 4);
/// digraph.add_arc_weighted(1, 2, 3);
/// digraph.add_arc_weighted(1, 3, 4);
/// digraph.add_arc_weighted(1, 4, 5);
/// digraph.add_arc_weighted(2, 3, 4);
/// digraph.add_arc_weighted(2, 4, 5);
/// digraph.add_arc_weighted(2, 5, 6);
///
/// assert!(
/// digraph
/// .out_neighbors_weighted(0)
/// .eq([(1, &2), (2, &3), (3, &4)])
/// );
///
/// assert!(
/// digraph
/// .out_neighbors_weighted(1)
/// .eq([(2, &3), (3, &4), (4, &5)])
/// );
///
/// assert!(
/// digraph
/// .out_neighbors_weighted(2)
/// .eq([(3, &4), (4, &5), (5, &6)])
/// );
/// ```
#[doc(alias = "out_neighbours_weighted")]
#[must_use]
fn out_neighbors_weighted(
&self,
u: usize,
) -> impl Iterator<Item = (usize, &Self::Weight)>;
}