Class descriptions with the same set of method pointers constitute a metaclass ? class descriptions are objects , too 有着同一组方法指针的类描述构成一个元类? ?类描述也是对象。
Because there are a few oodbs which support the metaclass mechanism , this methodology has limitation to some degree 但只有少数的oodbs支持元类机制,因此该方法存在一定的局限性。
There is a standard way to write all metaclass constructors so that the selector / method pairs can be specified in any order 这是写所有元类构造函数的标准方试,这样就可以以任意次序指定选择器/方法对偶。
I have some ideas for doing some tricky stuff with metaclasses in future library versions , and i might even work in properties and slots 对于未来库版本中的元类,我有几个技巧方面的想法,而且我甚至可能使用特性和插槽。
So . m . halper had presented a methodology based on the metaclass mechanism to incorporate the part - whole semantic relationships into oodbs 为此, m . halper等人提出了一种基于元类机制的,将部分-整体语义联系集成到oodbs中的方法。