问题
I would like to ask a question that follows this one which is pretty well answered by the define check if the compiler uses the standard. However this woks for C only. Is there a way to do the same in C++?
I do not wish to covert floating point types to text or use some pretty complex conversion functions. I just need the compiler check. If you know a list of such compatible compilers please post the link. I could not find it.
回答1:
Actually you have an easier way to achieve this in C++. From the C++ standard 18.2.1.1 the class numeric_limits exists within std. In order to access said static member you simply do this:
std::numeric_limits<double>::is_iec559;
Or:
std::numeric_limits<float>::is_iec559;
Which should return true if IEEE 754 is in use, false otherwise.
As an alternative method, the second part of Adam's answer should do it also for C++.
回答2:
Although this post is a bit old (10 years), you could still try this. It also works in C:
#ifndef __STDC_IEC_559__
#error The following Programm only supports float operations using the IEEE 754 Standard
#endif
来源：https://stackoverflow.com/questions/5777484/how-to-check-if-c-compiler-uses-ieee-754-floating-point-standard