Function bellman_ford_distances_with_mode 

pub fn bellman_ford_distances_with_mode(
    graph: &Graph,
    source: VertexId,
    weights: &[f64],
    mode: DijkstraMode,
) -> IgraphResult<Vec<Option<f64>>>

Single-source Bellman-Ford with directed-mode selection.

mode selects how directed edges are followed:

• DijkstraMode::Out follows out-edges (default for bellman_ford_distances),
• DijkstraMode::In follows in-edges (i.e. shortest paths into source),
• DijkstraMode::All ignores edge direction.

On undirected graphs the mode is ignored.

Counterpart of igraph_distances_bellman_ford(_, _, vss(source), vss_all(), weights, mode).

Examples

use rust_igraph::{Graph, bellman_ford_distances_with_mode, DijkstraMode};

let mut g = Graph::new(3, true).unwrap();
g.add_edge(0, 1).unwrap();
g.add_edge(1, 2).unwrap();
let d = bellman_ford_distances_with_mode(&g, 2, &[1.0, 1.0], DijkstraMode::In).unwrap();
assert!((d[0].unwrap() - 2.0).abs() < 1e-9);