40 lines
824 B
C++
40 lines
824 B
C++
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// (C) Copyright Matt Borland 2021.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_MATH_CCMATH_ISNAN
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#define BOOST_MATH_CCMATH_ISNAN
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#include <cmath>
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#include <type_traits>
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#include <boost/math/tools/is_constant_evaluated.hpp>
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namespace boost::math::ccmath {
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template <typename T>
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inline constexpr bool isnan(T x)
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{
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if(BOOST_MATH_IS_CONSTANT_EVALUATED(x))
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{
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return x != x;
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}
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else
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{
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using std::isnan;
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if constexpr (!std::is_integral_v<T>)
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{
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return isnan(x);
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}
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else
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{
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return isnan(static_cast<double>(x));
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}
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}
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}
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}
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#endif // BOOST_MATH_CCMATH_ISNAN
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