50 lines
1.2 KiB
C++
50 lines
1.2 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_ISINF
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#define BOOST_MATH_CCMATH_ISINF
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#include <boost/math/special_functions/fpclassify.hpp>
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#include <boost/math/ccmath/detail/config.hpp>
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#ifdef BOOST_MATH_NO_CCMATH
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#error "The header <boost/math/isinf.hpp> can only be used in C++17 and later."
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#endif
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namespace boost::math::ccmath {
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template <typename T>
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constexpr bool isinf BOOST_MATH_PREVENT_MACRO_SUBSTITUTION(T x) noexcept
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{
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if(BOOST_MATH_IS_CONSTANT_EVALUATED(x))
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{
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if constexpr (std::numeric_limits<T>::is_signed)
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{
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return x == std::numeric_limits<T>::infinity() || -x == std::numeric_limits<T>::infinity();
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}
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else
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{
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return x == std::numeric_limits<T>::infinity();
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}
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}
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else
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{
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using boost::math::isinf;
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if constexpr (!std::is_integral_v<T>)
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{
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return (isinf)(x);
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}
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else
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{
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return (isinf)(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_ISINF
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