Function igraph_sparsemat_init_eye 

pub unsafe extern "C" fn igraph_sparsemat_init_eye(
    A: *mut igraph_sparsemat_t,
    n: igraph_int_t,
    nzmax: igraph_int_t,
    value: igraph_real_t,
    compress: igraph_bool_t,
) -> igraph_error_t