lambda - Valas 闭包如何映射到 Genie？

Question

Vala Tutorial有一个 example about DBus using anonymous methods .

Bus.own_name (BusType.SESSION, "org.example.DemoService", /* name to register */
              BusNameOwnerFlags.NONE, /* flags */
              on_bus_aquired, /* callback function on registration succeeded */
              () => {}, /* callback on name register succeeded */
              () => stderr.printf ("Could not acquire name\n")); /* callback on name lost */

我正在尝试在 Genie 中重写此代码，但无法转换最后两行。 Genie Tutorial只有 an example on how to use a closure to define an event handler .

f.my_event += def (t, a)
    print "event was detected with value %d", a

如何在 Genie 的方法调用中使用匿名方法定义？

Answer 1

我认为没有办法。您必须使用“def”调用另一个进程。

Bus.own_name (BusType.SESSION, "org.example.DemoService", 
          BusNameOwnerFlags.NONE, 
          on_bus_aquired, 
          reg,
          err);

def reg()
    pass

def err()
    print "error"