pub unsafe extern "C" fn igraph_layout_graphopt(
graph: *const igraph_t,
res: *mut igraph_matrix_t,
niter: igraph_int_t,
node_charge: igraph_real_t,
node_mass: igraph_real_t,
spring_length: igraph_real_t,
spring_constant: igraph_real_t,
max_sa_movement: igraph_real_t,
use_seed: igraph_bool_t,
) -> igraph_error_t