The first plug-in packages two assets -- the profile introduced in the previous section and a data type library -- and is a model of core types commonly used in Objective-C programming.
第一个插件打包了两个资产——前面章节中提到的概要文件和一个数据类型库——它是一个核心类型的模型，经常在Objective-C编程中被用到。
In C, we make a data structure store data of any type by using void pointers to the data rather than by maintaining private copies of the data in the data structure itself.
在C语言中，我们通过使用空指针，而不是通过维护非公开的数据备份，使数据结构存储任何类型的数据。
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