pub unsafe extern "C" fn igraph_vit_create(
graph: *const igraph_t,
vs: igraph_vs_t,
vit: *mut igraph_vit_t,
) -> igraph_error_tpub unsafe extern "C" fn igraph_vit_create(
graph: *const igraph_t,
vs: igraph_vs_t,
vit: *mut igraph_vit_t,
) -> igraph_error_t