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If C++ 2011 is detected alta::isnan is equivalent to call std::isnan(x) in other cases we simulate isnan(x) by returning x!=x which true only when x is equal to NaN
8345431c
If C++ 2011 is detected alta::isnan is equivalent to call std::isnan(x) in other cases we simulate isnan(x) by returning x!=x which true only when x is equal to NaN