// Copyright John Maddock 2007. | |
// Use, modification and distribution are subject to 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) | |
#ifndef BOOST_MATH_ROUND_HPP | |
#define BOOST_MATH_ROUND_HPP | |
#ifdef _MSC_VER | |
#pragma once | |
#endif | |
#include <boost/math/tools/config.hpp> | |
#include <boost/math/policies/error_handling.hpp> | |
#include <boost/math/special_functions/fpclassify.hpp> | |
namespace boost{ namespace math{ | |
template <class T, class Policy> | |
inline T round(const T& v, const Policy& pol) | |
{ | |
BOOST_MATH_STD_USING | |
if(!(boost::math::isfinite)(v)) | |
return policies::raise_rounding_error("boost::math::round<%1%>(%1%)", 0, v, v, pol); | |
return v < 0 ? static_cast<T>(ceil(v - 0.5f)) : static_cast<T>(floor(v + 0.5f)); | |
} | |
template <class T> | |
inline T round(const T& v) | |
{ | |
return round(v, policies::policy<>()); | |
} | |
// | |
// The following functions will not compile unless T has an | |
// implicit convertion to the integer types. For user-defined | |
// number types this will likely not be the case. In that case | |
// these functions should either be specialized for the UDT in | |
// question, or else overloads should be placed in the same | |
// namespace as the UDT: these will then be found via argument | |
// dependent lookup. See our concept archetypes for examples. | |
// | |
template <class T, class Policy> | |
inline int iround(const T& v, const Policy& pol) | |
{ | |
BOOST_MATH_STD_USING | |
T r = boost::math::round(v, pol); | |
if(fabs(r) > (std::numeric_limits<int>::max)()) | |
return static_cast<int>(policies::raise_rounding_error("boost::math::iround<%1%>(%1%)", 0, v, 0, pol)); | |
return static_cast<int>(r); | |
} | |
template <class T> | |
inline int iround(const T& v) | |
{ | |
return iround(v, policies::policy<>()); | |
} | |
template <class T, class Policy> | |
inline long lround(const T& v, const Policy& pol) | |
{ | |
BOOST_MATH_STD_USING | |
T r = boost::math::round(v, pol); | |
if(fabs(r) > (std::numeric_limits<long>::max)()) | |
return static_cast<long int>(policies::raise_rounding_error("boost::math::lround<%1%>(%1%)", 0, v, 0L, pol)); | |
return static_cast<long int>(r); | |
} | |
template <class T> | |
inline long lround(const T& v) | |
{ | |
return lround(v, policies::policy<>()); | |
} | |
#ifdef BOOST_HAS_LONG_LONG | |
template <class T, class Policy> | |
inline boost::long_long_type llround(const T& v, const Policy& pol) | |
{ | |
BOOST_MATH_STD_USING | |
T r = boost::math::round(v, pol); | |
if(fabs(r) > (std::numeric_limits<boost::long_long_type>::max)()) | |
return static_cast<boost::long_long_type>(policies::raise_rounding_error("boost::math::llround<%1%>(%1%)", 0, v, 0LL, pol)); | |
return static_cast<boost::long_long_type>(r); | |
} | |
template <class T> | |
inline boost::long_long_type llround(const T& v) | |
{ | |
return llround(v, policies::policy<>()); | |
} | |
#endif | |
}} // namespaces | |
#endif // BOOST_MATH_ROUND_HPP |