82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
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// (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_COPYSIGN_HPP
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#define BOOST_MATH_CCMATH_COPYSIGN_HPP
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#include <cmath>
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#include <cstdint>
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#include <limits>
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#include <type_traits>
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#include <boost/math/tools/is_constant_evaluated.hpp>
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#include <boost/math/tools/promotion.hpp>
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#include <boost/math/tools/config.hpp>
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#include <boost/math/ccmath/abs.hpp>
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#include <boost/math/ccmath/signbit.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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constexpr T copysign_impl(const T mag, const T sgn) noexcept
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{
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if (boost::math::ccmath::signbit(sgn))
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{
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return -boost::math::ccmath::abs(mag);
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}
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else
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{
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return boost::math::ccmath::abs(mag);
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}
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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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constexpr Real copysign(Real mag, Real sgn) noexcept
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{
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if(BOOST_MATH_IS_CONSTANT_EVALUATED(mag))
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{
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return boost::math::ccmath::detail::copysign_impl(mag, sgn);
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}
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else
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{
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using std::copysign;
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return copysign(mag, sgn);
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}
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}
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template <typename T1, typename T2>
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constexpr auto copysign(T1 mag, T2 sgn) noexcept
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{
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if (BOOST_MATH_IS_CONSTANT_EVALUATED(mag))
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{
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using promoted_type = boost::math::tools::promote_args_2_t<T1, T2>;
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return boost::math::ccmath::copysign(static_cast<promoted_type>(mag), static_cast<promoted_type>(sgn));
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}
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else
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{
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using std::copysign;
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return copysign(mag, sgn);
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}
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}
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constexpr float copysignf(float mag, float sgn) noexcept
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{
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return boost::math::ccmath::copysign(mag, sgn);
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}
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#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
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constexpr long double copysignl(long double mag, long double sgn) noexcept
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{
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return boost::math::ccmath::copysign(mag, sgn);
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}
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#endif
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} // Namespaces
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#endif // BOOST_MATH_CCMATH_COPYSIGN_HPP
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