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Showing content from https://www.boost.org/doc/libs/release/libs/math/doc/html/math_toolkit/rounding/modf.html below:

#include <boost/math/special_functions/modf.hpp>
template <class T>
T modf(const T& v, T* ipart);

template <class T, class Policy>
T modf(const T& v, T* ipart, const Policy&);

template <class T>
T modf(const T& v, int* ipart);

template <class T, class Policy>
T modf(const T& v, int* ipart, const Policy&);

template <class T>
T modf(const T& v, long* ipart);

template <class T, class Policy>
T modf(const T& v, long* ipart, const Policy&);

template <class T>
T modf(const T& v, long long* ipart);

template <class T, class Policy>
T modf(const T& v, long long* ipart, const Policy&);

The modf functions store the integer part of v in *ipart and return the fractional part of v. The sign of the integer and fractional parts are the same as the sign of v.

If the argument v is either non-finite or else outside the range of the result type, then returns the result of rounding_error: by default this throws an instance of boost::math::rounding_error.


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