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_FPCLASSIFY
#define BOOST_MATH_CCMATH_FPCLASSIFY
#include <cmath>
#include <limits>
#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/isfinite.hpp>
namespace boost::math::ccmath {
template <typename T, std::enable_if_t<!std::is_integral_v<T>, bool> = true>
inline constexpr int fpclassify(T x)
{
if(BOOST_MATH_IS_CONSTANT_EVALUATED(x))
{
return boost::math::ccmath::isnan(x) ? FP_NAN :
boost::math::ccmath::isinf(x) ? FP_INFINITE :
boost::math::ccmath::abs(x) == T(0) ? FP_ZERO :
boost::math::ccmath::abs(x) > 0 && boost::math::ccmath::abs(x) < (std::numeric_limits<T>::min)() ? FP_SUBNORMAL : FP_NORMAL;
}
else
{
using std::fpclassify;
return fpclassify(x);
}
}
template <typename Z, std::enable_if_t<std::is_integral_v<Z>, bool> = true>
inline constexpr int fpclassify(Z x)
{
return boost::math::ccmath::fpclassify(static_cast<double>(x));
}
}
#endif // BOOST_MATH_CCMATH_FPCLASSIFY
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