IsFinite()等价

Question

以下定义的C#替换是什么？

#define IS_FINITE(x) (0x7FF0 != (*((unsigned short*)(&x) + 3) & 0x7FF0))

也许double.IsInfinity(x) == false还是double.IsNegativeInfinity(x) == false？

谢谢.

Answer 1

!double.IsInfinity(x) && !double.IsNaN(x)

参考文献:
http://pubs.opengroup.org/onlinepubs/009604499/functions/isfinite.html
http://msdn.microsoft.com/en-us/library/system.double.isinfinity.aspx
HTTP:// MSDN. microsoft.com/en-us/library/system.double.isnan.aspx