boost/multiprecision/detail/functions/trunc.hpp
///////////////////////////////////////////////////////////////////////////////
// Copyright 2022 Matt Borland. 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)
#ifndef BOOST_MP_DETAIL_FUNCTIONS_TRUNC_HPP
#define BOOST_MP_DETAIL_FUNCTIONS_TRUNC_HPP
#include <cmath>
#include <limits>
#include <stdexcept>
#include <boost/multiprecision/detail/standalone_config.hpp>
#include <boost/multiprecision/detail/no_exceptions_support.hpp>
#ifdef BOOST_MP_MATH_AVAILABLE
#include <boost/math/special_functions/trunc.hpp>
#endif
namespace boost { namespace multiprecision { namespace detail {
namespace impl {
template <typename T>
inline T trunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
{
using std::floor;
using std::ceil;
return (arg > 0) ? floor(arg) : ceil(arg);
}
} // namespace impl
#ifdef BOOST_MP_MATH_AVAILABLE
template <typename T>
inline long long lltrunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
{
return boost::math::lltrunc(arg);
}
template <typename T>
inline int itrunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
{
return boost::math::itrunc(arg);
}
#else
template <typename T>
inline long long lltrunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
{
if (arg > LLONG_MAX)
{
BOOST_MP_THROW_EXCEPTION(std::domain_error("arg cannot be converted into a long long"));
}
return static_cast<long long>(boost::multiprecision::detail::impl::trunc(arg));
}
template <typename T>
inline int itrunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
{
if (arg > static_cast<T>(INT_MAX))
{
BOOST_MP_THROW_EXCEPTION(std::domain_error("arg cannot be converted into an int"));
}
return static_cast<int>(boost::multiprecision::detail::impl::trunc(arg));
}
#endif
}}} // Namespaces
#endif // BOOST_MP_DETAIL_FUNCTIONS_TRUNC_HPP