Random.new

static VALUE
random_init(int argc, VALUE *argv, VALUE obj)
{
    rb_random_t *rnd = try_get_rnd(obj);
    const rb_random_interface_t *rng = rb_rand_if(obj);

    if (!rng) {
        rb_raise(rb_eTypeError, "undefined random interface: %s",
                 RTYPEDDATA_TYPE(obj)->wrap_struct_name);
    }

    unsigned int major = rng->version.major;
    unsigned int minor = rng->version.minor;
    if (major != RUBY_RANDOM_INTERFACE_VERSION_MAJOR) {
        rb_raise(rb_eTypeError, "Random interface version "
                 STRINGIZE(RUBY_RANDOM_INTERFACE_VERSION_MAJOR) "."
                 STRINGIZE(RUBY_RANDOM_INTERFACE_VERSION_MINOR) " "
                 "expected: %d.%d", major, minor);
    }
    argc = rb_check_arity(argc, 0, 1);
    rb_check_frozen(obj);
    if (argc == 0) {
        RB_OBJ_WRITE(obj, &rnd->seed, rand_init_default(rng, rnd));
    }
    else {
        RB_OBJ_WRITE(obj, &rnd->seed, rand_init(rng, rnd, rb_to_int(argv[0])));
    }
    return obj;
}