pub unsafe extern "C" fn igraph_blas_dgemm(
transpose_a: igraph_bool_t,
transpose_b: igraph_bool_t,
alpha: igraph_real_t,
a: *const igraph_matrix_t,
b: *const igraph_matrix_t,
beta: igraph_real_t,
c: *mut igraph_matrix_t,
) -> igraph_error_t