59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
// (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_ISFINITE
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#define BOOST_MATH_CCMATH_ISFINITE
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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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#include <boost/math/ccmath/isinf.hpp>
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#include <boost/math/ccmath/isnan.hpp>
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#include <boost/math/tools/is_standalone.hpp>
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#ifndef BOOST_MATH_STANDALONE
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#include <boost/config.hpp>
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#ifdef BOOST_NO_CXX17_IF_CONSTEXPR
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#error "The header <boost/math/norms.hpp> can only be used in C++17 and later."
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#endif
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#endif
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namespace boost::math::ccmath {
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template <typename T>
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inline constexpr bool isfinite(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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// bool isfinite (IntegralType arg) is a set of overloads accepting the arg argument of any integral type
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// equivalent to casting the integral argument arg to double (e.g. static_cast<double>(arg))
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if constexpr (std::is_integral_v<T>)
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{
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return !boost::math::ccmath::isinf(static_cast<double>(x)) && !boost::math::ccmath::isnan(static_cast<double>(x));
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}
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else
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{
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return !boost::math::ccmath::isinf(x) && !boost::math::ccmath::isnan(x);
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}
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}
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else
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{
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using std::isfinite;
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if constexpr (!std::is_integral_v<T>)
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{
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return isfinite(x);
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}
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else
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{
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return isfinite(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_ISFINITE
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