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_ISFINITE
#define BOOST_MATH_CCMATH_ISFINITE
#include <cmath>
#include <type_traits>
#include <boost/math/tools/is_constant_evaluated.hpp>
#include <boost/math/ccmath/isinf.hpp>
#include <boost/math/ccmath/isnan.hpp>
namespace boost::math::ccmath {
template <typename T>
inline constexpr bool isfinite(T x)
{
if(BOOST_MATH_IS_CONSTANT_EVALUATED(x))
{
// bool isfinite (IntegralType arg) is a set of overloads accepting the arg argument of any integral type
// equivalent to casting the integral argument arg to double (e.g. static_cast<double>(arg))
if constexpr (std::is_integral_v<T>)
{
return !boost::math::ccmath::isinf(static_cast<double>(x)) && !boost::math::ccmath::isnan(static_cast<double>(x));
}
else
{
return !boost::math::ccmath::isinf(x) && !boost::math::ccmath::isnan(x);
}
}
else
{
using std::isfinite;
if constexpr (!std::is_integral_v<T>)
{
return isfinite(x);
}
else
{
return isfinite(static_cast<double>(x));
}
}
}
}
#endif // BOOST_MATH_CCMATH_ISFINITE
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