63e88f80
 Hu Chunming
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// (C) Copyright Matt Borland 2021.
// (C) Copyright John Maddock 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_LDEXP_HPP
#define BOOST_MATH_CCMATH_LDEXP_HPP
#include <cmath>
#include <limits>
#include <type_traits>
#include <stdexcept>
#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>
namespace boost::math::ccmath {
namespace detail {
template <typename Real>
inline constexpr Real ldexp_impl(Real arg, int exp) noexcept
{
while(exp > 0)
{
arg *= 2;
--exp;
}
while(exp < 0)
{
arg /= 2;
++exp;
}
return arg;
}
} // Namespace detail
template <typename Real, std::enable_if_t<!std::is_integral_v<Real>, bool> = true>
inline constexpr Real ldexp(Real arg, int exp) 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::ldexp_impl(arg, exp);
}
else
{
using std::ldexp;
return ldexp(arg, exp);
}
}
template <typename Z, std::enable_if_t<std::is_integral_v<Z>, bool> = true>
inline constexpr double ldexp(Z arg, int exp) noexcept
{
return boost::math::ccmath::ldexp(static_cast<double>(arg), exp);
}
inline constexpr float ldexpf(float arg, int exp) noexcept
{
return boost::math::ccmath::ldexp(arg, exp);
}
#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
inline constexpr long double ldexpl(long double arg, int exp) noexcept
{
return boost::math::ccmath::ldexp(arg, exp);
}
#endif
} // Namespaces
#endif // BOOST_MATH_CCMATH_LDEXP_HPP
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