区分零和负零 [英] Distinguish zero and negative zero

问题描述

我在代码中遇到了一个函数返回双精度型的情况，该双精度型可能是零，负零或完全是另一个值。我需要区分零和负零，但默认的双重比较不需要。由于双精度格式，C ++不允许使用按位运算符比较双精度，因此我不确定如何继续。如何区分两者？

I have run into a situation in my code where a function returns a double, and it is possible for this double to be a zero, a negative zero, or another value entirely. I need to distinguish between zero and negative zero, but the default double comparison does not. Due to the format of doubles, C++ does not allow for comparison of doubles using bitwise operators, so I am unsure how to procede. How can I distinguish between the two?

推荐答案

致电 std :: signbit（） 来确定符号位的状态。

Call std::signbit() to determine the state of the sign bit.

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