mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-10-30 20:40:28 -04:00
130 lines
3.4 KiB
Plaintext
130 lines
3.4 KiB
Plaintext
|
|
[section:rounding Rounding Truncation and Integer Conversion]
|
|
|
|
[section:round Rounding Functions]
|
|
|
|
``#include <boost/math/special_functions/round.hpp>``
|
|
|
|
template <class T>
|
|
T round(const T& v);
|
|
|
|
template <class T, class Policy>
|
|
T round(const T& v, const Policy&);
|
|
|
|
template <class T>
|
|
int iround(const T& v);
|
|
|
|
template <class T, class Policy>
|
|
int iround(const T& v, const Policy&);
|
|
|
|
template <class T>
|
|
long lround(const T& v);
|
|
|
|
template <class T, class Policy>
|
|
long lround(const T& v, const Policy&);
|
|
|
|
template <class T>
|
|
long long llround(const T& v);
|
|
|
|
template <class T, class Policy>
|
|
long long llround(const T& v, const Policy&);
|
|
|
|
These functions return the closest integer to the argument /v/.
|
|
|
|
Halfway cases are rounded away from zero, regardless of the current rounding
|
|
direction.
|
|
|
|
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`.
|
|
|
|
[endsect]
|
|
|
|
[section:trunc Truncation Functions]
|
|
|
|
``#include <boost/math/special_functions/trunc.hpp>``
|
|
|
|
template <class T>
|
|
T trunc(const T& v);
|
|
|
|
template <class T, class Policy>
|
|
T trunc(const T& v, const Policy&);
|
|
|
|
template <class T>
|
|
int itrunc(const T& v);
|
|
|
|
template <class T, class Policy>
|
|
int itrunc(const T& v, const Policy&);
|
|
|
|
template <class T>
|
|
long ltrunc(const T& v);
|
|
|
|
template <class T, class Policy>
|
|
long ltrunc(const T& v, const Policy&);
|
|
|
|
template <class T>
|
|
long long lltrunc(const T& v);
|
|
|
|
template <class T, class Policy>
|
|
long long lltrunc(const T& v, const Policy&);
|
|
|
|
The trunc functions round their argument to the integer value,
|
|
nearest to but no larger in magnitude than the argument.
|
|
|
|
For example `itrunc(3.7)` would return `3` and `ltrunc(-4.6)`
|
|
would return `-4`.
|
|
|
|
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`.
|
|
|
|
[endsect]
|
|
|
|
[section:modf Integer and Fractional Part Splitting (modf)]
|
|
|
|
``#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`.
|
|
|
|
[endsect]
|
|
|
|
|
|
[endsect] [/section:rounding Rounding Truncation and Integer Conversion]
|
|
|
|
[/
|
|
Copyright 2006 John Maddock and Paul A. Bristow.
|
|
Distributed under the Boost Software License, Version 1.0.
|
|
(See accompanying file LICENSE_1_0.txt or copy at
|
|
http://www.boost.org/LICENSE_1_0.txt).
|
|
]
|