这是怎样的常量表达式进行评估？
所以我们要使用整型常量表达式。
例如，枚举成员的初始化式必须是常量表达式。
For example, the initializer of an enumerator must be a constant expression.
常量表达式是可在编译时可完全计算的表达式。
A constant-expression is an expression that can be fully evaluated at compile-time.
如果发现表达式是常量，那么就使用可以优化的常量表达式。
If the expression can be verified as a constant, then a constant expression (which is available for optimization) is used.
syntax接受一个转换表达式(由模板变量和常量表达式组成)并返回产生的语法对象。
Syntax takes a transformation expression consisting of template variables and constant expressions and returns the resulting syntax object.
另一个类似的频繁请求是允许非常量表达式显示为switch语句的case标签。
Another similar frequent request is to allow non-constant expressions to appear as case labels of switch statements.
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.
ExtractConstant与Extract LocalVariable相似，但是您必须选择静态常量表达式，重构工具将会把它转换成静态的final常量。
Extract constant is similar to Extract Local Variable, but you must select a static, constant expression, which the refactoring will convert to a static final constant.
ExtractConstant与Extract LocalVariable相似，但是您必须选择静态常量表达式，重构工具将会把它转换成静态的final常量。
Extract constant is similar to Extract Local Variable, but you must select a static, constant expression, which the refactoring will convert to a static final constant.
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