池接口——替代malloc进行工作的普通接口。
Pool interface — a vanilla interface that works as a malloc alternative.
协议不同于其方法存在的接口，作为普通函数，目前可以定义它们。
Protocols differ from interfaces in that their methods exist, as ordinary functions, the moment they are defined.
举例来说，对于数据库交互逻辑的设计师来说，不知道他们的逻辑是如何通过用户接口代码表示出来，是很普通的现象。
It is common for architects of database interaction logic, for example, to have no knowledge of how their logic is specifically expressed via user interface code.
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