77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
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///////////////////////////////////////////////////////////////////////////////
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// Copyright 2022 Matt Borland. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_MP_DETAIL_FUNCTIONS_TRUNC_HPP
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#define BOOST_MP_DETAIL_FUNCTIONS_TRUNC_HPP
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#include <cmath>
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#include <limits>
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#include <stdexcept>
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#include <boost/multiprecision/detail/standalone_config.hpp>
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#include <boost/multiprecision/detail/no_exceptions_support.hpp>
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#ifdef BOOST_MP_MATH_AVAILABLE
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#include <boost/math/special_functions/trunc.hpp>
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#endif
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namespace boost { namespace multiprecision { namespace detail {
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namespace impl {
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template <typename T>
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inline T trunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
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{
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using std::floor;
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using std::ceil;
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return (arg > 0) ? floor(arg) : ceil(arg);
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}
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} // namespace impl
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#ifdef BOOST_MP_MATH_AVAILABLE
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template <typename T>
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inline long long lltrunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
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{
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return boost::math::lltrunc(arg);
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}
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template <typename T>
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inline int itrunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
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{
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return boost::math::itrunc(arg);
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}
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#else
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template <typename T>
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inline long long lltrunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
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{
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if (arg > LLONG_MAX)
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{
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BOOST_MP_THROW_EXCEPTION(std::domain_error("arg cannot be converted into a long long"));
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}
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return static_cast<long long>(boost::multiprecision::detail::impl::trunc(arg));
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}
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template <typename T>
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inline int itrunc BOOST_PREVENT_MACRO_SUBSTITUTION (const T arg)
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{
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if (arg > static_cast<T>(INT_MAX))
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{
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BOOST_MP_THROW_EXCEPTION(std::domain_error("arg cannot be converted into an int"));
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}
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return static_cast<int>(boost::multiprecision::detail::impl::trunc(arg));
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}
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#endif
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}}} // Namespaces
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#endif // BOOST_MP_DETAIL_FUNCTIONS_TRUNC_HPP
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