How is this constant expression evaluated?
这是怎样的常量表达式进行评估?
So we have to use an integral constant expression.
所以我们要使用整型常量表达式。
Why using constant expression as a template parameter?
为什么使用常数表达式作为一个模板参数?
And we can simplify this expression as saying negative e squared over 4 pi, epsilon nought r squared. Epsilon nought is a constant, it's something you might see in physics as well.
也会遇到它,在这里,你可以就把它,理解为一个转换系数,我们需要做的。
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