Check if argument passed to node C++ addon is Infinity or NaN

Question

How do you check if an argument passed directly to a node C++ addon (not via a JS wrapper) is NaN or +/-Infinity?

I tried frexp(arg[0]->NumberValue(), &exponent) with the intent of checking if the exponent is 2047 (how JS represents NaN and Infinity), but evidently Local<Value>->NumberValue() obscures the double and changes the exp value.

score 2 · Accepted Answer · edited Sep 23 '16 at 05:58

2

For C++11 the reply is

std::isinf(x) || std::isnan(x)

edited Sep 23 '16 at 05:58

ZachB

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answered Aug 01 '15 at 06:53

marom

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std::isinf(x) not isinfo – shinichy Feb 09 '16 at 04:56

Check if argument passed to node C++ addon is Infinity or NaN

1 Answers1