pub unsafe extern "C" fn igraph_eigen_adjacency(
graph: *const igraph_t,
algorithm: igraph_eigen_algorithm_t,
which: *const igraph_eigen_which_t,
options: *mut igraph_arpack_options_t,
storage: *mut igraph_arpack_storage_t,
values: *mut igraph_vector_t,
vectors: *mut igraph_matrix_t,
cmplxvalues: *mut igraph_vector_complex_t,
cmplxvectors: *mut igraph_matrix_complex_t,
) -> igraph_error_t