71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
// (C) Copyright Matt Borland 2021.
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// Use, modification and distribution are subject to the
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// Boost 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_MATH_CCMATH_TRUNC_HPP
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#define BOOST_MATH_CCMATH_TRUNC_HPP
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#include <boost/math/ccmath/detail/config.hpp>
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#ifdef BOOST_MATH_NO_CCMATH
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#error "The header <boost/math/trunc.hpp> can only be used in C++17 and later."
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#endif
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#include <boost/math/ccmath/abs.hpp>
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#include <boost/math/ccmath/isinf.hpp>
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#include <boost/math/ccmath/isnan.hpp>
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#include <boost/math/ccmath/floor.hpp>
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#include <boost/math/ccmath/ceil.hpp>
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namespace boost::math::ccmath {
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namespace detail {
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template <typename T>
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inline constexpr T trunc_impl(T arg) noexcept
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{
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return (arg > 0) ? boost::math::ccmath::floor(arg) : boost::math::ccmath::ceil(arg);
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}
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} // Namespace detail
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template <typename Real, std::enable_if_t<!std::is_integral_v<Real>, bool> = true>
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inline constexpr Real trunc(Real arg) noexcept
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{
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if(BOOST_MATH_IS_CONSTANT_EVALUATED(arg))
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{
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return boost::math::ccmath::abs(arg) == Real(0) ? arg :
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boost::math::ccmath::isinf(arg) ? arg :
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boost::math::ccmath::isnan(arg) ? arg :
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boost::math::ccmath::detail::trunc_impl(arg);
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}
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else
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{
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using std::trunc;
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return trunc(arg);
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}
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}
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template <typename Z, std::enable_if_t<std::is_integral_v<Z>, bool> = true>
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inline constexpr double trunc(Z arg) noexcept
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{
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return boost::math::ccmath::trunc(static_cast<double>(arg));
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}
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inline constexpr float truncf(float arg) noexcept
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{
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return boost::math::ccmath::trunc(arg);
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}
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#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
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inline constexpr long double truncl(long double arg) noexcept
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{
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return boost::math::ccmath::trunc(arg);
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}
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#endif
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} // Namespaces
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#endif // BOOST_MATH_CCMATH_TRUNC_HPP
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