宏过程和宏函数可以有40层嵌套。

Procedures and macro functions can be nested up to 40 levels.

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如果表达式不是常量，就调用另一个宏函数把值向上取整到2的幂。

Otherwise, if the expression is not a constant, another macro function is called to round up the value to a power of two.

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它们包含用于所有可作为该工具箱的一部分的常数、结构、宏、公共函数的定义。

They contain definitions for all the constants, structures, macros, and public functions available as part of the toolkit.

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