它定义一个具有单一参数credentials的函数，供auth -constraints宏使用。
It defines a function with a single argument, credentials, which will be used by the auth-constraints macro.
给定参数(如果有且定义为宏)的展开。
The expansion of the given arguments (if any and if these are defined as macros).
不能将具有参数的预处理器宏用作值定义。
You cannot use preprocessor macros with arguments as value definitions.
它还提供了一些功能，可用来管理各种可选配置、实现可重用库的细节以及让用户以自定义宏将过程参数化。
It also provides features to manage alternate configurations, implement reusable libraries of specifications, and parameterize processes with user-defined macros.
它还提供了一些功能，可用来管理各种可选配置、实现可重用库的细节以及让用户以自定义宏将过程参数化。
It also provides features to manage alternate configurations, implement reusable libraries of specifications, and parameterize processes with user-defined macros.
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