112 lines
3.9 KiB
C++
112 lines
3.9 KiB
C++
// 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_TRUNC_HPP
|
|
#define BOOST_MATH_TRUNC_HPP
|
|
|
|
#ifdef _MSC_VER
|
|
#pragma once
|
|
#endif
|
|
|
|
#include <boost/math/special_functions/math_fwd.hpp>
|
|
#include <boost/math/tools/config.hpp>
|
|
#include <boost/math/policies/error_handling.hpp>
|
|
#include <boost/math/special_functions/fpclassify.hpp>
|
|
|
|
namespace boost{ namespace math{ namespace detail{
|
|
|
|
template <class T, class Policy>
|
|
inline typename tools::promote_args<T>::type trunc(const T& v, const Policy& pol, const mpl::false_&)
|
|
{
|
|
BOOST_MATH_STD_USING
|
|
typedef typename tools::promote_args<T>::type result_type;
|
|
if(!(boost::math::isfinite)(v))
|
|
return policies::raise_rounding_error("boost::math::trunc<%1%>(%1%)", 0, static_cast<result_type>(v), static_cast<result_type>(v), pol);
|
|
return (v >= 0) ? static_cast<result_type>(floor(v)) : static_cast<result_type>(ceil(v));
|
|
}
|
|
|
|
template <class T, class Policy>
|
|
inline typename tools::promote_args<T>::type trunc(const T& v, const Policy&, const mpl::true_&)
|
|
{
|
|
return v;
|
|
}
|
|
|
|
}
|
|
|
|
template <class T, class Policy>
|
|
inline typename tools::promote_args<T>::type trunc(const T& v, const Policy& pol)
|
|
{
|
|
return detail::trunc(v, pol, mpl::bool_<detail::is_integer_for_rounding<T>::value>());
|
|
}
|
|
template <class T>
|
|
inline typename tools::promote_args<T>::type trunc(const T& v)
|
|
{
|
|
return trunc(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 itrunc(const T& v, const Policy& pol)
|
|
{
|
|
BOOST_MATH_STD_USING
|
|
typedef typename tools::promote_args<T>::type result_type;
|
|
result_type r = boost::math::trunc(v, pol);
|
|
if((r > (std::numeric_limits<int>::max)()) || (r < (std::numeric_limits<int>::min)()))
|
|
return static_cast<int>(policies::raise_rounding_error("boost::math::itrunc<%1%>(%1%)", 0, static_cast<result_type>(v), 0, pol));
|
|
return static_cast<int>(r);
|
|
}
|
|
template <class T>
|
|
inline int itrunc(const T& v)
|
|
{
|
|
return itrunc(v, policies::policy<>());
|
|
}
|
|
|
|
template <class T, class Policy>
|
|
inline long ltrunc(const T& v, const Policy& pol)
|
|
{
|
|
BOOST_MATH_STD_USING
|
|
typedef typename tools::promote_args<T>::type result_type;
|
|
result_type r = boost::math::trunc(v, pol);
|
|
if((r > (std::numeric_limits<long>::max)()) || (r < (std::numeric_limits<long>::min)()))
|
|
return static_cast<long>(policies::raise_rounding_error("boost::math::ltrunc<%1%>(%1%)", 0, static_cast<result_type>(v), 0L, pol));
|
|
return static_cast<long>(r);
|
|
}
|
|
template <class T>
|
|
inline long ltrunc(const T& v)
|
|
{
|
|
return ltrunc(v, policies::policy<>());
|
|
}
|
|
|
|
#ifdef BOOST_HAS_LONG_LONG
|
|
|
|
template <class T, class Policy>
|
|
inline boost::long_long_type lltrunc(const T& v, const Policy& pol)
|
|
{
|
|
BOOST_MATH_STD_USING
|
|
typedef typename tools::promote_args<T>::type result_type;
|
|
result_type r = boost::math::trunc(v, pol);
|
|
if((r > (std::numeric_limits<boost::long_long_type>::max)()) || (r < (std::numeric_limits<boost::long_long_type>::min)()))
|
|
return static_cast<boost::long_long_type>(policies::raise_rounding_error("boost::math::lltrunc<%1%>(%1%)", 0, v, static_cast<boost::long_long_type>(0), pol));
|
|
return static_cast<boost::long_long_type>(r);
|
|
}
|
|
template <class T>
|
|
inline boost::long_long_type lltrunc(const T& v)
|
|
{
|
|
return lltrunc(v, policies::policy<>());
|
|
}
|
|
|
|
#endif
|
|
|
|
}} // namespaces
|
|
|
|
#endif // BOOST_MATH_TRUNC_HPP
|