pub unsafe extern "C" fn igraph_lapack_dsyevr(
A: *const igraph_matrix_t,
which: igraph_lapack_dsyev_which_t,
vl: igraph_real_t,
vu: igraph_real_t,
vestimate: c_int,
il: c_int,
iu: c_int,
abstol: igraph_real_t,
values: *mut igraph_vector_t,
vectors: *mut igraph_matrix_t,
support: *mut igraph_vector_int_t,
) -> igraph_error_t