43 lines
998 B
C++
43 lines
998 B
C++
// (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_ISNAN
|
|
#define BOOST_MATH_CCMATH_ISNAN
|
|
|
|
#include <boost/math/special_functions/fpclassify.hpp>
|
|
#include <boost/math/ccmath/detail/config.hpp>
|
|
|
|
#ifdef BOOST_MATH_NO_CCMATH
|
|
#error "The header <boost/math/isnan.hpp> can only be used in C++17 and later."
|
|
#endif
|
|
|
|
namespace boost::math::ccmath {
|
|
|
|
template <typename T>
|
|
inline constexpr bool isnan BOOST_MATH_PREVENT_MACRO_SUBSTITUTION(T x)
|
|
{
|
|
if(BOOST_MATH_IS_CONSTANT_EVALUATED(x))
|
|
{
|
|
return x != x;
|
|
}
|
|
else
|
|
{
|
|
using boost::math::isnan;
|
|
|
|
if constexpr (!std::is_integral_v<T>)
|
|
{
|
|
return (isnan)(x);
|
|
}
|
|
else
|
|
{
|
|
return (isnan)(static_cast<double>(x));
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
#endif // BOOST_MATH_CCMATH_ISNAN
|