Boost有一整套测试工具，基本上可以说它们是用于验证表达式的宏。

Boost has a whole host of test tools, which are basically macros used to validate expressions.

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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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您将学到 Lambda 表达式、递归和宏。

You'll see Lambda expressions, recursion, and macros.

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