Function steiner_tree_approximation 

pub fn steiner_tree_approximation<G, F>(
    graph: &G,
    terminals: &[G::Node],
    edge_cost: F,
) -> Result<Option<SteinerTree<G::Node, G::Edge>>>
where
    G: IndexUndirectedGraphView,
    F: Fn(G::Edge) -> u64,

Builds a deterministic metric-closure Steiner-tree approximation.

Errors

Returns an error when path or tree cost arithmetic overflows.