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File: trunc.hpp
// (C) Copyright Matt Borland 2021. // 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_CCMATH_TRUNC_HPP #define BOOST_MATH_CCMATH_TRUNC_HPP #include <cmath> #include <type_traits> #include <boost/math/tools/is_constant_evaluated.hpp> #include <boost/math/ccmath/abs.hpp> #include <boost/math/ccmath/isinf.hpp> #include <boost/math/ccmath/isnan.hpp> #include <boost/math/ccmath/floor.hpp> #include <boost/math/ccmath/ceil.hpp> namespace boost::math::ccmath { namespace detail { template <typename T> inline constexpr T trunc_impl(T arg) noexcept { return (arg > 0) ? boost::math::ccmath::floor(arg) : boost::math::ccmath::ceil(arg); } } // Namespace detail template <typename Real, std::enable_if_t<!std::is_integral_v<Real>, bool> = true> inline constexpr Real trunc(Real arg) noexcept { if(BOOST_MATH_IS_CONSTANT_EVALUATED(arg)) { return boost::math::ccmath::abs(arg) == Real(0) ? arg : boost::math::ccmath::isinf(arg) ? arg : boost::math::ccmath::isnan(arg) ? arg : boost::math::ccmath::detail::trunc_impl(arg); } else { using std::trunc; return trunc(arg); } } template <typename Z, std::enable_if_t<std::is_integral_v<Z>, bool> = true> inline constexpr double trunc(Z arg) noexcept { return boost::math::ccmath::trunc(static_cast<double>(arg)); } inline constexpr float truncf(float arg) noexcept { return boost::math::ccmath::trunc(arg); } #ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS inline constexpr long double truncl(long double arg) noexcept { return boost::math::ccmath::trunc(arg); } #endif } // Namespaces #endif // BOOST_MATH_CCMATH_TRUNC_HPP