3.4. igraph_isohandler_t — Callback type, called when an isomorphism was found

typedef igraph_bool_t igraph_isohandler_t(const igraph_vector_t *map12, 
					  const igraph_vector_t *map21, void *arg);

See the details at the documentation of igraph_isomorphic_function_vf2().

Arguments:

`map12`:	The mapping from the first graph to the second.
`map21`:	The mapping from the second graph to the first, the inverse of `map12` basically.
`arg`:	This extra argument was passed to `igraph_isomorphic_function_vf2()` when it was called.

Returns:

Boolean, whether to continue with the isomorphism search.