deserializer._readHostObject()

此方法用于读取某种主机对象，即由原生 C++ 绑定创建的对象。如果无法反序列化数据，应抛出适当的异常。

【This method is called to read some kind of host object, i.e. an object that is created by native C++ bindings. If it is not possible to deserialize the data, a suitable exception should be thrown.】

这个方法本身并不存在于 Deserializer 类中，但可以由子类提供。

【This method is not present on the Deserializer class itself but can be provided by subclasses.】