第一个例子是用静态查询表达式。

Our first example USES a static query expression.

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一定要记住，在使用静态断言时，检查的表达式在编译时必须是可计算的。

While using static assertions, always remember that the expression being checked must be evaluable at compile time.

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在常量表达式，比如枚举型常量、位域的宽度或是静态变量的初始值，是不允许使用在这种声明中的。

Embedded statements are not allowed in constant expressions, such as the value of an enumeration constant, the width of a bit-field, or the initial value of a static variable.

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