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