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130 lines
3.4 KiB
Plaintext
130 lines
3.4 KiB
Plaintext
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[section:rounding Rounding Truncation and Integer Conversion]
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[section:round Rounding Functions]
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``#include <boost/math/special_functions/round.hpp>``
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template <class T>
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T round(const T& v);
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template <class T, class Policy>
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T round(const T& v, const Policy&);
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template <class T>
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int iround(const T& v);
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template <class T, class Policy>
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int iround(const T& v, const Policy&);
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template <class T>
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long lround(const T& v);
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template <class T, class Policy>
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long lround(const T& v, const Policy&);
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template <class T>
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long long llround(const T& v);
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template <class T, class Policy>
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long long llround(const T& v, const Policy&);
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These functions return the closest integer to the argument /v/.
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Halfway cases are rounded away from zero, regardless of the current rounding
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direction.
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If the argument /v/ is either non-finite or else outside the range
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of the result type, then returns the result of __rounding_error: by
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default this throws an instance of `boost::math::rounding_error`.
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[endsect]
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[section:trunc Truncation Functions]
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``#include <boost/math/special_functions/trunc.hpp>``
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template <class T>
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T trunc(const T& v);
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template <class T, class Policy>
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T trunc(const T& v, const Policy&);
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template <class T>
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int itrunc(const T& v);
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template <class T, class Policy>
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int itrunc(const T& v, const Policy&);
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template <class T>
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long ltrunc(const T& v);
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template <class T, class Policy>
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long ltrunc(const T& v, const Policy&);
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template <class T>
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long long lltrunc(const T& v);
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template <class T, class Policy>
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long long lltrunc(const T& v, const Policy&);
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The trunc functions round their argument to the integer value,
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nearest to but no larger in magnitude than the argument.
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For example `itrunc(3.7)` would return `3` and `ltrunc(-4.6)`
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would return `-4`.
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If the argument /v/ is either non-finite or else outside the range
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of the result type, then returns the result of __rounding_error: by
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default this throws an instance of `boost::math::rounding_error`.
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[endsect]
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[section:modf Integer and Fractional Part Splitting (modf)]
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``#include <boost/math/special_functions/modf.hpp>``
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template <class T>
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T modf(const T& v, T* ipart);
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template <class T, class Policy>
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T modf(const T& v, T* ipart, const Policy&);
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template <class T>
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T modf(const T& v, int* ipart);
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template <class T, class Policy>
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T modf(const T& v, int* ipart, const Policy&);
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template <class T>
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T modf(const T& v, long* ipart);
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template <class T, class Policy>
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T modf(const T& v, long* ipart, const Policy&);
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template <class T>
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T modf(const T& v, long long* ipart);
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template <class T, class Policy>
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T modf(const T& v, long long* ipart, const Policy&);
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The `modf` functions store the integer part of /v/ in `*ipart`
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and return the fractional part of /v/. The sign of the integer
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and fractional parts are the same as the sign of /v/.
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If the argument /v/ is either non-finite or else outside the range
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of the result type, then returns the result of __rounding_error: by
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default this throws an instance of `boost::math::rounding_error`.
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[endsect]
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[endsect] [/section:rounding Rounding Truncation and Integer Conversion]
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[/
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Copyright 2006 John Maddock and Paul A. Bristow.
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt).
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]
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