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float_advance函數將一個浮點數增長一個指定數目的 ULP.
#include <boost/math/special_functions/next.hpp>
namespace boost{ namespace math{ template <class FPT> FPT float_advance(FPT val, int distance); }} // namespaces
返回一個浮點數r 滿足float_distance(val, r) ==
distance.