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#include <stdint.h> // since <cstdint> is part of c++0x upcoming standard
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#include <boost/math/special_functions/fpclassify.hpp> // isnan, isinf
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* Smallest double such: 1.0 + DBL_EPS == 1.0 is still true.
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* Smallest float such: 1.0 + FLT_EPS == 1.0 is still true.
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* Determines if a number is considered as NaN (aka Not a Number) or not.