63e88f80
 Hu Chunming
提交三方库
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// (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_COPYSIGN_HPP
#define BOOST_MATH_CCMATH_COPYSIGN_HPP
#include <cmath>
#include <cstdint>
#include <limits>
#include <type_traits>
#include <boost/math/tools/is_constant_evaluated.hpp>
#include <boost/math/tools/promotion.hpp>
#include <boost/math/tools/config.hpp>
#include <boost/math/ccmath/abs.hpp>
#include <boost/math/ccmath/signbit.hpp>
namespace boost::math::ccmath {
namespace detail {
template <typename T>
constexpr T copysign_impl(const T mag, const T sgn) noexcept
{
if (boost::math::ccmath::signbit(sgn))
{
return -boost::math::ccmath::abs(mag);
}
else
{
return boost::math::ccmath::abs(mag);
}
}
} // Namespace detail
template <typename Real, std::enable_if_t<!std::is_integral_v<Real>, bool> = true>
constexpr Real copysign(Real mag, Real sgn) noexcept
{
if(BOOST_MATH_IS_CONSTANT_EVALUATED(mag))
{
return boost::math::ccmath::detail::copysign_impl(mag, sgn);
}
else
{
using std::copysign;
return copysign(mag, sgn);
}
}
template <typename T1, typename T2>
constexpr auto copysign(T1 mag, T2 sgn) noexcept
{
if (BOOST_MATH_IS_CONSTANT_EVALUATED(mag))
{
using promoted_type = boost::math::tools::promote_args_2_t<T1, T2>;
return boost::math::ccmath::copysign(static_cast<promoted_type>(mag), static_cast<promoted_type>(sgn));
}
else
{
using std::copysign;
return copysign(mag, sgn);
}
}
constexpr float copysignf(float mag, float sgn) noexcept
{
return boost::math::ccmath::copysign(mag, sgn);
}
#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
constexpr long double copysignl(long double mag, long double sgn) noexcept
{
return boost::math::ccmath::copysign(mag, sgn);
}
#endif
} // Namespaces
#endif // BOOST_MATH_CCMATH_COPYSIGN_HPP
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