The only thing that will change is the typedef itself.
唯一要改的是typedef本身。
Obviously, the use of a typedef here isn't a prerogative but a must.
显然，这里使用typedef不是一种特权，而是一种必需。
You could use a typedef to define a callback and make clients supply it, something similar to qsort-but that's so old-hat.
你可以用typedef来定义一个回调并让客户机来提供这个回调，这种做法有些类似qsort——但那样太老土了。
