Field enumeration integrity for bounded types.
绑定类型的字段枚举完整性。
In this solution, the enumeration field is not changed.
在该解决方案中,枚举字段不会变化。
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.
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。
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