Return true if the specified floating point number has a value that does not represent a real number ("not-a-number" or "NaN"), and false otherwise. This function is equivalent to the isnan macro in C99. Note that if this method returns true, then either isQuietNan or isSignalingNan will also return true.
Declared in <bdlb_float.h>
static
bool
isNan(float number);