pub fn subgraph_isomorphisms_iter<'a, G0, G1, NM, EM>(
    g0: &'a G0,
    g1: &'a G1,
    node_match: &'a mut NM,
    edge_match: &'a mut EM
) -> Option<impl Iterator<Item = Vec<usize, Global>> + 'a>where
    G0: 'a + NodeCompactIndexable + EdgeCount + DataMap + GetAdjacencyMatrix + GraphProp + IntoEdgesDirected,
    G1: 'a + NodeCompactIndexable + EdgeCount + DataMap + GetAdjacencyMatrix + GraphProp<EdgeType = <G0 as GraphProp>::EdgeType> + IntoEdgesDirected,
    NM: 'a + FnMut(&<G0 as Data>::NodeWeight, &<G1 as Data>::NodeWeight) -> bool,
    EM: 'a + FnMut(&<G0 as Data>::EdgeWeight, &<G1 as Data>::EdgeWeight) -> bool,
Expand description

Using the VF2 algorithm, examine both syntactic and semantic graph isomorphism (graph structure and matching node and edge weights) and, if g0 is isomorphic to a subgraph of g1, return the mappings between them.

The graphs should not be multigraphs.