error问题
'isnan' was not declared in this scope
isnan在cmath中被取消宏定义；
// These are possible macros imported from C99-land. #undef fpclassify #undef isfinite #undef isinf #undef isnan
使用的时候可以在isnan前加上std命名空间即可；
【error】'isnan' was not declared in this scope
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